Phoebe Wang de34a940ae [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

2021-11-18 11:20:32 +08:00

246 KiB

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