diff options
Diffstat (limited to 'compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp')
| -rw-r--r-- | compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp index 664d2adbdc1..af2353fbb19 100644 --- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp +++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp @@ -418,17 +418,11 @@ extern "C" LLVMAttributeRef LLVMRustCreateMemoryEffectsAttr(LLVMContextRef C, } } -<<<<<<< HEAD // Enable all fast-math flags, including those which will cause floating-point operations // to return poison for some well-defined inputs. This function can only be used to build // unsafe Rust intrinsics. That unsafety does permit additional optimizations, but at the // time of writing, their value is not well-understood relative to those enabled by // LLVMRustSetAlgebraicMath. -||||||| parent of 019019d83e2 (make simd_reduce_{mul,add}_unordered use only the 'reassoc' flag, not all fast-math flags) -// Enable a fast-math flag -======= -// Enable all fast-math flags ->>>>>>> 019019d83e2 (make simd_reduce_{mul,add}_unordered use only the 'reassoc' flag, not all fast-math flags) // // https://llvm.org/docs/LangRef.html#fast-math-flags extern "C" void LLVMRustSetFastMath(LLVMValueRef V) { @@ -456,7 +450,12 @@ extern "C" void LLVMRustSetAlgebraicMath(LLVMValueRef V) { } } -// Enable the reassoc fast-math flag +// Enable the reassoc fast-math flag, allowing transformations that pretend +// floating-point addition and multiplication are associative. +// +// Note that this does NOT enable any flags which can cause a floating-point operation on +// well-defined inputs to return poison, and therefore this function can be used to build +// safe Rust intrinsics (such as fadd_algebraic). // // https://llvm.org/docs/LangRef.html#fast-math-flags extern "C" void LLVMRustSetAllowReassoc(LLVMValueRef V) { |