[llvm-commits] [llvm] r115021 - in /llvm/trunk: lib/Target/X86/X86MCCodeEmitter.cpp test/MC/AsmParser/X86/x86_instructions.s

[Eli Friedman]

On Tue, Sep 28, 2010 at 8:33 PM, Chris Lattner <sabre at nondot.org> wrote:
> +// rdar://8482675 - 32-bit mem operand support in 64-bit mode (0x67 prefix)
> +leal   8(%eax), %esi
> +// CHECK: leal 8(%eax), %esi
> +// CHECK: encoding: [0x67,0x8d,0x70,0x08]
> +leaq   8(%eax), %rsi
> +// CHECK: leaq 8(%eax), %rsi
> +// CHECK: encoding: [0x67,0x48,0x8d,0x70,0x08]

Wow, does anyone actually use constructs like this?  As far as I can
tell, they're longer than the forms without any prefixes and don't
have any benefit I can think of.

-Eli