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llvm: Don't use the optimized jump table construction logic for wasm.

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Alex Rønne Petersen 2024-09-10 05:00:02 +02:00 • committed by Andrew Kelley
parent 36b89101df
commit 2fc1f9b971
1 changed files with 6 additions and 0 deletions
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6
src/codegen/llvm.zig
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@ -6544,6 +6544,12 @@ pub const FuncGen = struct {
const jmp_table: ?SwitchDispatchInfo.JmpTable = jmp_table: {
if (!is_dispatch_loop) break :jmp_table null;
// Workaround for:
// * https://github.com/llvm/llvm-project/blob/56905dab7da50bccfcceaeb496b206ff476127e1/llvm/lib/MC/WasmObjectWriter.cpp#L560
// * https://github.com/llvm/llvm-project/blob/56905dab7da50bccfcceaeb496b206ff476127e1/llvm/test/MC/WebAssembly/blockaddress.ll
if (zcu.comp.getTarget().isWasm()) break :jmp_table null;
// On a 64-bit target, 1024 pointers in our jump table is about 8K of pointers. This seems just
// about acceptable - it won't fill L1d cache on most CPUs.
const max_table_len = 1024;