[cfe-dev] Patch: Add support for pusha/popa

[Nico Weber]

Hi,

the attached patch adds support for "pusha" and "popa" in asm blocks.
It's strictly speaking an llvm patch, but I'm not on llvm-dev.

The binary produced by clang with for the two instructions matches gcc
in i386 mode. In x86_64 mode, gcc correctly points out that the
instruction is 32-bit only, while clang doesn't do this yet. nicholas
on irc says that that's probably because clang doesn't check for
32/64bit mismatches yet for inline assembly.

Let me know what you think.

Thanks,
Nico
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