[all-commits] [llvm/llvm-project] de34a9: [X86] Add -mskip-rax-setup support to align with GCC
Phoebe Wang via All-commits
all-commits at lists.llvm.org
Wed Nov 17 19:20:48 PST 2021
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: de34a940ae72dfa6425a025538484f9505ca1d42
https://github.com/llvm/llvm-project/commit/de34a940ae72dfa6425a025538484f9505ca1d42
Author: Phoebe Wang <pengfei.wang at intel.com>
Date: 2021-11-18 (Thu, 18 Nov 2021)
Changed paths:
M clang/include/clang/Basic/CodeGenOptions.def
M clang/include/clang/Driver/Options.td
M clang/lib/CodeGen/CodeGenModule.cpp
M clang/lib/Driver/ToolChains/Clang.cpp
A clang/test/CodeGen/pr23258.c
M clang/test/Driver/x86_features.c
M llvm/lib/Target/X86/X86ISelLowering.cpp
A llvm/test/CodeGen/X86/pr23258.ll
Log Message:
-----------
[X86] Add -mskip-rax-setup support to align with GCC
AMD64 ABI mandates caller to specify the number of used SSE registers
when passing variable arguments.
GCC also provides option -mskip-rax-setup to skip the setup of rax when
SSE is disabled. This helps to reduce the code size, see pr23258.
Reviewed By: nickdesaulniers
Differential Revision: https://reviews.llvm.org/D112413
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