https://sourceware.org/bugzilla/show_bug.cgi?id=20145
Bug ID: 20145
Summary: Improve x86 .noXXX directives
Product: binutils
Version: 2.27 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
CC: kirill.yukhin at intel dot com
Target Milestone: ---
Target: x86
X86 assembler should support
.arch .noXXX
to disable XXX instructions and all instructions which depend on
XXX. We can take a look at OPTION_MASK_ISA_XXX_UNSETs in
gcc/common/config/i386/i386-common.c. TODO:
1. Should ".noavx" disable AVX512? Many, if not all, AVX instructions
can be encoded with AVX512. ".arch noavx" can be used to encode AVX
instructions in AVX512.
2. Extend i386-gen.c to generate CPU_ANY_XXX_FLAGS automatically.
3. Should CPU_AVX flags include MMX?
4. Should CPU_AVX flags include SSE?
5. Should CPU_AVX512 flags include MMX?
6. Should CPU_AVX512 flags include SSE?
7. Should CPU_AVX512 flags include AVX?
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