Sema: Allow small integer types to coerce to floats

If the float can store all possible values of the integer without
rounding, coercion is allowed. The integer's precision must be less than
or equal to the float's significand precision.

Closes #18614

build.zig

@@ -91,6 +91,8 @@ pub fn build(b: *std.Build) !void {
     const skip_libc = b.option(bool, "skip-libc", "Main test suite skips tests that link libc") orelse false;
     const skip_single_threaded = b.option(bool, "skip-single-threaded", "Main test suite skips tests that are single-threaded") orelse false;
     const skip_compile_errors = b.option(bool, "skip-compile-errors", "Main test suite skips compile error tests") orelse false;
+    const skip_spirv = b.option(bool, "skip-spirv", "Main test suite skips targets with spirv32/spirv64 architecture") orelse false;
+    const skip_wasm = b.option(bool, "skip-wasm", "Main test suite skips targets with wasm32/wasm64 architecture") orelse false;
     const skip_freebsd = b.option(bool, "skip-freebsd", "Main test suite skips targets with freebsd OS") orelse false;
     const skip_netbsd = b.option(bool, "skip-netbsd", "Main test suite skips targets with netbsd OS") orelse false;
     const skip_windows = b.option(bool, "skip-windows", "Main test suite skips targets with windows OS") orelse false;
@@ -421,6 +423,8 @@ pub fn build(b: *std.Build) !void {
         .test_target_filters = test_target_filters,
         .skip_compile_errors = skip_compile_errors,
         .skip_non_native = skip_non_native,
+        .skip_spirv = skip_spirv,
+        .skip_wasm = skip_wasm,
         .skip_freebsd = skip_freebsd,
         .skip_netbsd = skip_netbsd,
         .skip_windows = skip_windows,
@@ -452,6 +456,8 @@ pub fn build(b: *std.Build) !void {
         .skip_single_threaded = skip_single_threaded,
         .skip_non_native = skip_non_native,
         .test_default_only = no_matrix,
+        .skip_spirv = skip_spirv,
+        .skip_wasm = skip_wasm,
         .skip_freebsd = skip_freebsd,
         .skip_netbsd = skip_netbsd,
         .skip_windows = skip_windows,
@@ -459,8 +465,29 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        // 3888779264 was observed on an x86_64-linux-gnu host.
+        .max_rss = switch (b.graph.host.result.os.tag) {
-        .max_rss = 4000000000,
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1_060_217_241,
+                else => 1_100_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 659_809_075,
+                .loongarch64 => 598_902_374,
+                .riscv64 => 731_258_880,
+                .s390x => 580_596_121,
+                .x86_64 => 3_290_894_745,
+                else => 3_300_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 767_736_217,
+                else => 800_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 603_070_054,
+                else => 700_000_000,
+            },
+            else => 3_300_000_000,
+        },
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -475,6 +502,8 @@ pub fn build(b: *std.Build) !void {
         .skip_single_threaded = true,
         .skip_non_native = skip_non_native,
         .test_default_only = no_matrix,
+        .skip_spirv = skip_spirv,
+        .skip_wasm = skip_wasm,
         .skip_freebsd = skip_freebsd,
         .skip_netbsd = skip_netbsd,
         .skip_windows = skip_windows,
@@ -483,6 +512,29 @@ pub fn build(b: *std.Build) !void {
         .skip_llvm = skip_llvm,
         .skip_libc = true,
         .no_builtin = true,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 743_802_470,
+                else => 800_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 639_565_414,
+                .loongarch64 => 598_884_352,
+                .riscv64 => 636_429_516,
+                .s390x => 574_166_630,
+                .x86_64 => 764_861_644,
+                else => 800_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 701_413_785,
+                else => 800_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 536_414_208,
+                else => 600_000_000,
+            },
+            else => 800_000_000,
+        },
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -497,6 +549,8 @@ pub fn build(b: *std.Build) !void {
         .skip_single_threaded = true,
         .skip_non_native = skip_non_native,
         .test_default_only = no_matrix,
+        .skip_spirv = skip_spirv,
+        .skip_wasm = skip_wasm,
         .skip_freebsd = skip_freebsd,
         .skip_netbsd = skip_netbsd,
         .skip_windows = skip_windows,
@@ -505,6 +559,29 @@ pub fn build(b: *std.Build) !void {
         .skip_llvm = skip_llvm,
         .skip_libc = true,
         .no_builtin = true,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 557_892_403,
+                else => 600_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 615_302_758,
+                .loongarch64 => 598_974_464,
+                .riscv64 => 382_786_764,
+                .s390x => 395_555_635,
+                .x86_64 => 692_348_518,
+                else => 700_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 451_389_030,
+                else => 500_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 367_747_072,
+                else => 400_000_000,
+            },
+            else => 700_000_000,
+        },
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -519,6 +596,8 @@ pub fn build(b: *std.Build) !void {
         .skip_single_threaded = skip_single_threaded,
         .skip_non_native = skip_non_native,
         .test_default_only = no_matrix,
+        .skip_spirv = skip_spirv,
+        .skip_wasm = skip_wasm,
         .skip_freebsd = skip_freebsd,
         .skip_netbsd = skip_netbsd,
         .skip_windows = skip_windows,
@@ -526,8 +605,29 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        // I observed a value of 5605064704 on the M2 CI.
+        .max_rss = switch (b.graph.host.result.os.tag) {
-        .max_rss = 6165571174,
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 3_756_422_348,
+                else => 3_800_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 6_732_817_203,
+                .loongarch64 => 3_216_349_593,
+                .riscv64 => 3_570_899_763,
+                .s390x => 3_652_514_201,
+                .x86_64 => 3_249_546_854,
+                else => 6_800_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 8_273_795_481,
+                else => 8_300_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 3_750_236_160,
+                else => 3_800_000_000,
+            },
+            else => 8_300_000_000,
+        },
     }));
 
     const unit_tests_step = b.step("test-unit", "Run the compiler source unit tests");
@@ -543,6 +643,29 @@ pub fn build(b: *std.Build) !void {
         .use_llvm = use_llvm,
         .use_lld = use_llvm,
         .zig_lib_dir = b.path("lib"),
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 2_188_099_584,
+                else => 2_200_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 1_991_934_771,
+                .loongarch64 => 1_844_538_572,
+                .riscv64 => 2_459_003_289,
+                .s390x => 1_781_248_409,
+                .x86_64 => 977_192_550,
+                else => 2_500_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 2_062_393_344,
+                else => 2_100_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1_953_087_488,
+                else => 2_000_000_000,
+            },
+            else => 2_500_000_000,
+        },
     });
     if (link_libc) {
         unit_tests.root_module.link_libc = true;
@@ -560,6 +683,7 @@ pub fn build(b: *std.Build) !void {
     test_step.dependOn(tests.addCAbiTests(b, .{
         .test_target_filters = test_target_filters,
         .skip_non_native = skip_non_native,
+        .skip_wasm = skip_wasm,
         .skip_freebsd = skip_freebsd,
         .skip_netbsd = skip_netbsd,
         .skip_windows = skip_windows,
@@ -567,6 +691,29 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_release = skip_release,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 727_221_862,
+                else => 800_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 1_318_185_369,
+                .loongarch64 => 1_422_904_524,
+                .riscv64 => 449_924_710,
+                .s390x => 1_946_743_603,
+                .x86_64 => 2_139_993_292,
+                else => 2_200_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 1_813_612_134,
+                else => 1_900_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 386_287_616,
+                else => 400_000_000,
+            },
+            else => 2_200_000_000,
+        },
     }));
     test_step.dependOn(tests.addLinkTests(b, enable_macos_sdk, enable_ios_sdk, enable_symlinks_windows));
     test_step.dependOn(tests.addStackTraceTests(b, test_filters, skip_non_native));
@@ -616,6 +763,7 @@ pub fn build(b: *std.Build) !void {
         .optimize_modes = optimization_modes,
         .test_filters = test_filters,
         .test_target_filters = test_target_filters,
+        .skip_wasm = skip_wasm,
         // Highest RSS observed in any test case was exactly 1802878976 on x86_64-linux.
         .max_rss = 2253598720,
     })) |test_libc_step| test_step.dependOn(test_libc_step);
@@ -721,7 +869,29 @@ fn addCompilerMod(b: *std.Build, options: AddCompilerModOptions) *std.Build.Modu
 fn addCompilerStep(b: *std.Build, options: AddCompilerModOptions) *std.Build.Step.Compile {
     const exe = b.addExecutable(.{
         .name = "zig",
-        .max_rss = 7_800_000_000,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 6_044_158_771,
+                else => 6_100_000_000,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 6_240_805_683,
+                .loongarch64 => 5_024_158_515,
+                .riscv64 => 6_996_309_196,
+                .s390x => 4_997_174_476,
+                .x86_64 => 5_486_090_649,
+                else => 7_000_000_000,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 6_639_145_779,
+                else => 6_700_000_000,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 5_770_394_009,
+                else => 5_800_000_000,
+            },
+            else => 7_000_000_000,
+        },
         .root_module = addCompilerMod(b, options),
     });
     exe.stack_size = stack_size;
@@ -798,7 +968,7 @@ fn addCmakeCfgOptionsToExe(
                 };
                 mod.linkSystemLibrary("unwind", .{});
             },
-            .ios, .macos, .watchos, .tvos, .visionos => {
+            .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => {
                 mod.link_libcpp = true;
             },
             .windows => {

ci/aarch64-linux-debug.sh

@@ -44,7 +44,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-debug/bin/zig build test docs \
-  --maxrss 44918199637 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dtarget=native-native-musl \

ci/aarch64-linux-release.sh

@@ -44,7 +44,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-release/bin/zig build test docs \
-  --maxrss 44918199637 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dtarget=native-native-musl \

ci/aarch64-macos-debug.sh

@@ -42,6 +42,7 @@ cmake .. \
 ninja install
 
 stage3-debug/bin/zig build test docs \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   --zig-lib-dir "$PWD/../lib" \
   -Denable-macos-sdk \
   -Dstatic-llvm \

ci/aarch64-macos-release.sh

@@ -51,6 +51,7 @@ stage3-release/bin/zig build test docs \
 
 # Ensure that stage3 and stage4 are byte-for-byte identical.
 stage3-release/bin/zig build \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   --prefix stage4-release \
   -Denable-llvm \
   -Dno-lib \

ci/aarch64-windows.ps1

@@ -5,6 +5,7 @@ $ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip
 $PREFIX_PATH = "$(Get-Location)\..\$ZIG_LLVM_CLANG_LLD_NAME"
 $ZIG = "$PREFIX_PATH\bin\zig.exe"
 $ZIG_LIB_DIR = "$(Get-Location)\lib"
+$ZSF_MAX_RSS = if ($Env:ZSF_MAX_RSS) { $Env:ZSF_MAX_RSS } else { 0 }
 
 if (!(Test-Path "..\$ZIG_LLVM_CLANG_LLD_NAME.zip")) {
     Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
@@ -54,6 +55,7 @@ CheckLastExitCode
 
 Write-Output "Main test suite..."
 & "stage3-release\bin\zig.exe" build test docs `
+  --maxrss $ZSF_MAX_RSS `
   --zig-lib-dir "$ZIG_LIB_DIR" `
   --search-prefix "$PREFIX_PATH" `
   -Dstatic-llvm `

ci/loongarch64-linux-debug.sh

@@ -45,7 +45,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-debug/bin/zig build test docs \
-  --maxrss 60129542144 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dtarget=native-native-musl \

ci/loongarch64-linux-release.sh

@@ -45,7 +45,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-release/bin/zig build test docs \
-  --maxrss 60129542144 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dtarget=native-native-musl \

ci/riscv64-linux-debug.sh

@@ -44,7 +44,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-debug/bin/zig build test-cases test-modules test-unit test-c-abi test-stack-traces test-error-traces test-llvm-ir \
-  --maxrss 68719476736 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dskip-single-threaded \

ci/riscv64-linux-release.sh

@@ -44,7 +44,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-release/bin/zig build test-cases test-modules test-unit test-c-abi test-stack-traces test-error-traces test-llvm-ir \
-  --maxrss 68719476736 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dskip-single-threaded \

ci/s390x-linux-debug.sh

@@ -45,7 +45,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-debug/bin/zig build test docs \
-  --maxrss 30064771072 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dtarget=native-native-musl \

ci/s390x-linux-release.sh

@@ -45,7 +45,7 @@ ninja install
 
 # No -fqemu and -fwasmtime here as they're covered by the x86_64-linux scripts.
 stage3-release/bin/zig build test docs \
-  --maxrss 30064771072 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
   -Dskip-non-native \
   -Dtarget=native-native-musl \

ci/x86_64-freebsd-debug.sh

@@ -44,8 +44,10 @@ unset CXX
 ninja install
 
 stage3-debug/bin/zig build test docs \
-  --maxrss 42949672960 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
+  -Dskip-spirv \
+  -Dskip-wasm \
   -Dskip-linux \
   -Dskip-netbsd \
   -Dskip-windows \

ci/x86_64-freebsd-release.sh

@@ -44,8 +44,10 @@ unset CXX
 ninja install
 
 stage3-release/bin/zig build test docs \
-  --maxrss 42949672960 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dstatic-llvm \
+  -Dskip-spirv \
+  -Dskip-wasm \
   -Dskip-linux \
   -Dskip-netbsd \
   -Dskip-windows \

ci/x86_64-linux-debug-llvm.sh

@@ -49,7 +49,7 @@ stage3-debug/bin/zig build \
   -Dno-lib
 
 stage3-debug/bin/zig build test docs \
-  --maxrss 21000000000 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dlldb=$HOME/deps/lldb-zig/Debug-e0a42bb34/bin/lldb \
   -fqemu \
   -fwasmtime \

ci/x86_64-linux-debug.sh

@@ -48,7 +48,7 @@ stage3-debug/bin/zig build \
   -Dno-lib
 
 stage3-debug/bin/zig build test docs \
-  --maxrss 21000000000 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dlldb=$HOME/deps/lldb-zig/Debug-e0a42bb34/bin/lldb \
   -fqemu \
   -fwasmtime \

ci/x86_64-linux-release.sh

@@ -54,7 +54,7 @@ stage3-release/bin/zig build \
   -Dno-lib
 
 stage3-release/bin/zig build test docs \
-  --maxrss 21000000000 \
+  --maxrss ${ZSF_MAX_RSS:-0} \
   -Dlldb=$HOME/deps/lldb-zig/Release-e0a42bb34/bin/lldb \
   -fqemu \
   -fwasmtime \

ci/x86_64-windows-debug.ps1

@@ -5,6 +5,7 @@ $ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip
 $PREFIX_PATH = "$($Env:USERPROFILE)\$ZIG_LLVM_CLANG_LLD_NAME"
 $ZIG = "$PREFIX_PATH\bin\zig.exe"
 $ZIG_LIB_DIR = "$(Get-Location)\lib"
+$ZSF_MAX_RSS = if ($Env:ZSF_MAX_RSS) { $Env:ZSF_MAX_RSS } else { 0 }
 
 if (!(Test-Path "$PREFIX_PATH.zip")) {
     Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
@@ -54,12 +55,11 @@ CheckLastExitCode
 
 Write-Output "Main test suite..."
 & "stage3-debug\bin\zig.exe" build test docs `
-  --maxrss 32212254720 `
+  --maxrss $ZSF_MAX_RSS `
   --zig-lib-dir "$ZIG_LIB_DIR" `
   --search-prefix "$PREFIX_PATH" `
   -Dstatic-llvm `
   -Dskip-non-native `
-  -Dskip-release `
   -Dskip-test-incremental `
   -Denable-symlinks-windows `
   --test-timeout 30m

ci/x86_64-windows-release.ps1

@@ -5,6 +5,7 @@ $ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip
 $PREFIX_PATH = "$($Env:USERPROFILE)\$ZIG_LLVM_CLANG_LLD_NAME"
 $ZIG = "$PREFIX_PATH\bin\zig.exe"
 $ZIG_LIB_DIR = "$(Get-Location)\lib"
+$ZSF_MAX_RSS = if ($Env:ZSF_MAX_RSS) { $Env:ZSF_MAX_RSS } else { 0 }
 
 if (!(Test-Path "$PREFIX_PATH.zip")) {
     Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
@@ -54,7 +55,7 @@ CheckLastExitCode
 
 Write-Output "Main test suite..."
 & "stage3-release\bin\zig.exe" build test docs `
-  --maxrss 32212254720 `
+  --maxrss $ZSF_MAX_RSS `
   --zig-lib-dir "$ZIG_LIB_DIR" `
   --search-prefix "$PREFIX_PATH" `
   -Dstatic-llvm `

doc/langref.html.in

@@ -3449,6 +3449,16 @@ void do_a_thing(struct Foo *foo) {
       </p>
       {#code|test_integer_widening.zig#}
 
+      {#header_close#}
+      {#header_open|Type Coercion: Int to Float#}
+      <p>
+      {#link|Integers#} coerce to {#link|Floats#} if every possible integer value can be stored in the float
+      without rounding (i.e. the integer's precision does not exceed the float's significand precision).
+      Larger integer types that cannot be safely coerced must be explicitly casted with {#link|@floatFromInt#}.
+      </p>
+      {#code|test_int_to_float_coercion.zig#}
+      {#code|test_failed_int_to_float_coercion.zig#}
+
       {#header_close#}
       {#header_open|Type Coercion: Float to Int#}
       <p>

doc/langref/test_failed_int_to_float_coercion.zig

@@ -0,0 +1,8 @@
+test "integer type is too large for implicit cast to float" {
+    var int: u25 = 123;
+    _ = ∫
+    const float: f32 = int;
+    _ = float;
+}
+
+// test_error=

doc/langref/test_int_to_float_coercion.zig

@@ -0,0 +1,12 @@
+const std = @import("std");
+const expectEqual = std.testing.expectEqual;
+
+test "implicit integer to float" {
+    var int: u8 = 123;
+    _ = ∫
+    const float: f32 = int;
+    const int_from_float: u8 = @intFromFloat(float);
+    try expectEqual(int, int_from_float);
+}
+
+// test

lib/std/c.zig

@@ -4471,7 +4471,7 @@ pub const rusage = switch (native_os) {
         pub const SELF = 1;
         pub const CHILDREN = 2;
     },
-    .freebsd => extern struct {
+    .freebsd, .openbsd => extern struct {
         utime: timeval,
         stime: timeval,
         maxrss: c_long,
@@ -4493,6 +4493,27 @@ pub const rusage = switch (native_os) {
         pub const CHILDREN = -1;
         pub const THREAD = 1;
     },
+    .dragonfly, .netbsd => extern struct {
+        utime: timeval,
+        stime: timeval,
+        maxrss: c_long,
+        ixrss: c_long,
+        idrss: c_long,
+        isrss: c_long,
+        minflt: c_long,
+        majflt: c_long,
+        nswap: c_long,
+        inblock: c_long,
+        oublock: c_long,
+        msgsnd: c_long,
+        msgrcv: c_long,
+        nsignals: c_long,
+        nvcsw: c_long,
+        nivcsw: c_long,
+
+        pub const SELF = 0;
+        pub const CHILDREN = -1;
+    },
     else => void,
 };
 

lib/std/process/Child.zig

@@ -122,7 +122,7 @@ pub const ResourceUsageStatistics = struct {
     /// if available.
     pub inline fn getMaxRss(rus: ResourceUsageStatistics) ?usize {
         switch (native_os) {
-            .linux => {
+            .dragonfly, .freebsd, .netbsd, .openbsd, .illumos, .linux, .serenity => {
                 if (rus.rusage) |ru| {
                     return @as(usize, @intCast(ru.maxrss)) * 1024;
                 } else {
@@ -149,7 +149,21 @@ pub const ResourceUsageStatistics = struct {
     }
 
     const rusage_init = switch (native_os) {
-        .linux, .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => @as(?posix.rusage, null),
+        .dragonfly,
+        .freebsd,
+        .netbsd,
+        .openbsd,
+        .illumos,
+        .linux,
+        .serenity,
+        .driverkit,
+        .ios,
+        .maccatalyst,
+        .macos,
+        .tvos,
+        .visionos,
+        .watchos,
+        => @as(?posix.rusage, null),
         .windows => @as(?windows.VM_COUNTERS, null),
         else => {},
     };
@@ -486,7 +500,21 @@ fn waitUnwrappedPosix(self: *ChildProcess) void {
     const res: posix.WaitPidResult = res: {
         if (self.request_resource_usage_statistics) {
             switch (native_os) {
-                .linux, .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => {
+                .dragonfly,
+                .freebsd,
+                .netbsd,
+                .openbsd,
+                .illumos,
+                .linux,
+                .serenity,
+                .driverkit,
+                .ios,
+                .maccatalyst,
+                .macos,
+                .tvos,
+                .visionos,
+                .watchos,
+                => {
                     var ru: posix.rusage = undefined;
                     const res = posix.wait4(self.id, 0, &ru);
                     self.resource_usage_statistics.rusage = ru;

src/Sema.zig

@@ -28479,7 +28479,7 @@ pub fn coerce(
     };
 }
 
-const CoersionError = CompileError || error{
+const CoercionError = CompileError || error{
     /// When coerce is called recursively, this error should be returned instead of using `fail`
     /// to ensure correct types in compile errors.
     NotCoercible,
@@ -28518,7 +28518,7 @@ fn coerceExtra(
     inst: Air.Inst.Ref,
     inst_src: LazySrcLoc,
     opts: CoerceOpts,
-) CoersionError!Air.Inst.Ref {
+) CoercionError!Air.Inst.Ref {
     if (dest_ty.isGenericPoison()) return inst;
     const pt = sema.pt;
     const zcu = pt.zcu;
@@ -28945,6 +28945,20 @@ fn coerceExtra(
                         if (!opts.report_err) return error.NotCoercible;
                         return sema.failWithNeededComptime(block, inst_src, .{ .simple = .casted_to_comptime_float });
                     }
+                    const int_info = inst_ty.intInfo(zcu);
+                    const int_precision = int_info.bits - @intFromBool(int_info.signedness == .signed);
+                    const float_precision: u8 = switch (dest_ty.toIntern()) {
+                        .f16_type => 11,
+                        .f32_type => 24,
+                        .f64_type => 53,
+                        .f80_type => 64,
+                        .f128_type => 113,
+                        else => unreachable,
+                    };
+                    if (int_precision <= float_precision) {
+                        try sema.requireRuntimeBlock(block, inst_src, null);
+                        return block.addTyOp(.float_from_int, dest_ty, inst);
+                    }
                     break :int;
                 };
                 const result_val = try val.floatFromIntAdvanced(sema.arena, inst_ty, dest_ty, pt, .sema);

test/behavior/cast.zig

@@ -157,6 +157,60 @@ test "@floatFromInt(f80)" {
     try comptime S.doTheTest(i256);
 }
 
+test "type coercion from int to float" {
+    const check = struct {
+        // Check that an integer value can be coerced to a float type and
+        // then converted back to the original value without rounding issues.
+        fn value(Float: type, int: anytype) !void {
+            const float: Float = int;
+            const Int = @TypeOf(int);
+            try std.testing.expectEqual(int, @as(Int, @intFromFloat(float)));
+            if (Float != f80) { // https://codeberg.org/ziglang/zig/issues/30035
+                try std.testing.expectEqual(int, @as(Int, @intFromFloat(@ceil(float))));
+                try std.testing.expectEqual(int, @as(Int, @intFromFloat(@floor(float))));
+            }
+        }
+
+        // Exhaustively check that all possible values of the integer type can
+        // safely be coerced to the float type.
+        fn allValues(Float: type, Int: type) !void {
+            var int: Int = std.math.minInt(Int);
+            while (int < std.math.maxInt(Int)) : (int += 1)
+                try value(Float, int);
+        }
+
+        // Check that the min and max values of the integer type can safely be
+        // coerced to the float type.
+        fn edgeValues(Float: type, Int: type) !void {
+            var int: Int = std.math.minInt(Int);
+            try value(Float, int);
+            int = std.math.maxInt(Int);
+            try value(Float, int);
+        }
+    };
+
+    try check.allValues(f16, u11);
+    try check.allValues(f16, i12);
+
+    try check.edgeValues(f32, u24);
+    try check.edgeValues(f32, i25);
+
+    try check.edgeValues(f64, u53);
+    try check.edgeValues(f64, i54);
+
+    try check.edgeValues(f80, u64);
+    try check.edgeValues(f80, i65);
+
+    try check.edgeValues(f128, u113);
+    try check.edgeValues(f128, i114);
+
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
+
+    // Basic sanity check that the coercions work for vectors too.
+    const int_vec: @Vector(2, u24) = @splat(123);
+    try check.value(@Vector(2, f32), int_vec);
+}
+
 test "@intFromFloat" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO

test/cases/compile_errors/coerce_int_to_float.zig

@@ -0,0 +1,52 @@
+// Test that integer types above a certain size will not coerce to a float.
+
+fn testCoerce(Float: type, Int: type) void {
+    var i: Int = 0;
+    _ = &i;
+    _ = @as(Float, i);
+}
+
+export fn entry() void {
+    testCoerce(f16, u11); // Okay
+    testCoerce(f16, u12); // Too big
+
+    testCoerce(f16, i12);
+    testCoerce(f16, i13);
+
+    testCoerce(f32, u24);
+    testCoerce(f32, u25);
+
+    testCoerce(f32, i25);
+    testCoerce(f32, i26);
+
+    testCoerce(f64, u53);
+    testCoerce(f64, u54);
+
+    testCoerce(f64, i54);
+    testCoerce(f64, i55);
+
+    testCoerce(f80, u64);
+    testCoerce(f80, u65);
+
+    testCoerce(f80, i65);
+    testCoerce(f80, i66);
+
+    testCoerce(f128, u113);
+    testCoerce(f128, u114);
+
+    testCoerce(f128, i114);
+    testCoerce(f128, i115);
+}
+
+// error
+//
+// :6:20: error: expected type 'f16', found 'u12'
+// :6:20: error: expected type 'f16', found 'i13'
+// :6:20: error: expected type 'f32', found 'u25'
+// :6:20: error: expected type 'f32', found 'i26'
+// :6:20: error: expected type 'f64', found 'u54'
+// :6:20: error: expected type 'f64', found 'i55'
+// :6:20: error: expected type 'f80', found 'u65'
+// :6:20: error: expected type 'f80', found 'i66'
+// :6:20: error: expected type 'f128', found 'u114'
+// :6:20: error: expected type 'f128', found 'i115'

test/src/Cases.zig

@@ -444,6 +444,8 @@ pub const CaseTestOptions = struct {
     test_target_filters: []const []const u8,
     skip_compile_errors: bool,
     skip_non_native: bool,
+    skip_spirv: bool,
+    skip_wasm: bool,
     skip_freebsd: bool,
     skip_netbsd: bool,
     skip_windows: bool,
@@ -472,6 +474,9 @@ pub fn lowerToBuildSteps(
         if (options.skip_non_native and !case.target.query.isNative())
             continue;
 
+        if (options.skip_spirv and case.target.query.cpu_arch != null and case.target.query.cpu_arch.?.isSpirV()) continue;
+        if (options.skip_wasm and case.target.query.cpu_arch != null and case.target.query.cpu_arch.?.isWasm()) continue;
+
         if (options.skip_freebsd and case.target.query.os_tag == .freebsd) continue;
         if (options.skip_netbsd and case.target.query.os_tag == .netbsd) continue;
         if (options.skip_windows and case.target.query.os_tag == .windows) continue;

test/src/Libc.zig

@@ -10,6 +10,7 @@ pub const Options = struct {
     optimize_modes: []const std.builtin.OptimizeMode,
     test_filters: []const []const u8,
     test_target_filters: []const []const u8,
+    skip_wasm: bool,
     max_rss: usize,
 };
 
@@ -41,6 +42,8 @@ pub fn addLibcTestCase(
 }
 
 pub fn addTarget(libc: *const Libc, target: std.Build.ResolvedTarget) void {
+    if (libc.options.skip_wasm and target.query.cpu_arch != null and target.query.cpu_arch.?.isWasm()) return;
+
     if (libc.options.test_target_filters.len > 0) {
         const triple_txt = target.query.zigTriple(libc.b.allocator) catch @panic("OOM");
         for (libc.options.test_target_filters) |filter| {

test/tests.zig

@@ -2246,6 +2246,8 @@ const ModuleTestOptions = struct {
     test_default_only: bool,
     skip_single_threaded: bool,
     skip_non_native: bool,
+    skip_spirv: bool,
+    skip_wasm: bool,
     skip_freebsd: bool,
     skip_netbsd: bool,
     skip_windows: bool,
@@ -2281,6 +2283,9 @@ pub fn addModuleTests(b: *std.Build, options: ModuleTestOptions) *Step {
         if (options.skip_non_native and !test_target.target.isNative())
             continue;
 
+        if (options.skip_spirv and test_target.target.cpu_arch != null and test_target.target.cpu_arch.?.isSpirV()) continue;
+        if (options.skip_wasm and test_target.target.cpu_arch != null and test_target.target.cpu_arch.?.isWasm()) continue;
+
         if (options.skip_freebsd and test_target.target.os_tag == .freebsd) continue;
         if (options.skip_netbsd and test_target.target.os_tag == .netbsd) continue;
         if (options.skip_windows and test_target.target.os_tag == .windows) continue;
@@ -2339,8 +2344,11 @@ fn addOneModuleTest(
     const libc_suffix = if (test_target.link_libc == true) "-libc" else "";
     const model_txt = target.cpu.model.name;
 
-    // wasm32-wasi builds need more RAM, idk why
+    // These emulated targets need a lot more RAM for unknown reasons.
-    const max_rss = if (target.os.tag == .wasi)
+    const max_rss = if (mem.eql(u8, options.name, "std") and
+        (target.cpu.arch == .hexagon or
+            (target.cpu.arch.isRISCV() and !resolved_target.query.isNative()) or
+            target.cpu.arch.isWasm()))
         options.max_rss * 2
     else
         options.max_rss;
@@ -2519,6 +2527,7 @@ pub fn wouldUseLlvm(use_llvm: ?bool, query: std.Target.Query, optimize_mode: Opt
 const CAbiTestOptions = struct {
     test_target_filters: []const []const u8,
     skip_non_native: bool,
+    skip_wasm: bool,
     skip_freebsd: bool,
     skip_netbsd: bool,
     skip_windows: bool,
@@ -2526,6 +2535,7 @@ const CAbiTestOptions = struct {
     skip_linux: bool,
     skip_llvm: bool,
     skip_release: bool,
+    max_rss: usize = 0,
 };
 
 pub fn addCAbiTests(b: *std.Build, options: CAbiTestOptions) *Step {
@@ -2538,6 +2548,9 @@ pub fn addCAbiTests(b: *std.Build, options: CAbiTestOptions) *Step {
 
         for (c_abi_targets) |c_abi_target| {
             if (options.skip_non_native and !c_abi_target.target.isNative()) continue;
+
+            if (options.skip_wasm and c_abi_target.target.cpu_arch != null and c_abi_target.target.cpu_arch.?.isWasm()) continue;
+
             if (options.skip_freebsd and c_abi_target.target.os_tag == .freebsd) continue;
             if (options.skip_netbsd and c_abi_target.target.os_tag == .netbsd) continue;
             if (options.skip_windows and c_abi_target.target.os_tag == .windows) continue;
@@ -2595,6 +2608,7 @@ pub fn addCAbiTests(b: *std.Build, options: CAbiTestOptions) *Step {
                 .root_module = test_mod,
                 .use_llvm = c_abi_target.use_llvm,
                 .use_lld = c_abi_target.use_lld,
+                .max_rss = options.max_rss,
             });
 
             // This test is intentionally trying to check if the external ABI is