[llvm-commits] PATCH: llvm-gcc option to emit "va_arg" instruction

[David Meyer]

Chris,

I've attached an alternative version of the patch which does not include the
user-visible flag.

Instead, to activate the emission of the va_arg instruction, you can modify
TARGET_GIMPLIFY_VA_ARG_EXPR in the target configuration and recompile.

For example, in gcc/config/i386/i386.c:

#define TARGET_GIMPLIFY_VA_ARG_EXPR ix86_gimplify_va_arg

Can be changed to:

#define TARGET_GIMPLIFY_VA_ARG_EXPR llvm_gimplify_va_arg_expr

To activate va_arg for x86 and x86-64.

- David M
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