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Don't set fast(-math) for certain simd ops

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`fast-math` implies things like functions not being able to accept as an
argument or return as a result, say, `inf` which made these functions
confusingly named or behaving incorrectly, depending on how you
interpret it. Since the time when these intrinsics have been implemented
the intrinsics user's (stdsimd) approach has changed significantly and
so now it is required that these intrinsics operate normally rather than
in "whatever" way.

Fixes #84268
This commit is contained in:
Simonas Kazlauskas 2021-04-17 20:40:59 +03:00
parent cd9b30527e
commit 487e27350a
19 changed files with 154 additions and 131 deletions
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6
compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
View file

@ -349,8 +349,10 @@ extern "C" void LLVMRustRemoveFunctionAttributes(LLVMValueRef Fn,
F->setAttributes(PALNew);
}
// enable fpmath flag UnsafeAlgebra
extern "C" void LLVMRustSetHasUnsafeAlgebra(LLVMValueRef V) {
// Enable a fast-math flag
//
// https://llvm.org/docs/LangRef.html#fast-math-flags
extern "C" void LLVMRustSetFastMath(LLVMValueRef V) {
if (auto I = dyn_cast<Instruction>(unwrap<Value>(V))) {
I->setFast(true);
}