1
0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-22 07:32:48 +00:00
llvm-6502/lib/Target/X86/README-MMX.txt
2008-02-14 05:43:18 +00:00

44 lines
925 B
Plaintext

//===---------------------------------------------------------------------===//
// Random ideas for the X86 backend: MMX-specific stuff.
//===---------------------------------------------------------------------===//
//===---------------------------------------------------------------------===//
This:
#include <mmintrin.h>
__v2si qux(int A) {
return (__v2si){ 0, A };
}
is compiled into:
_qux:
subl $28, %esp
movl 32(%esp), %eax
movd %eax, %mm0
movq %mm0, (%esp)
movl (%esp), %eax
movl %eax, 20(%esp)
movq %mm0, 8(%esp)
movl 12(%esp), %eax
movl %eax, 16(%esp)
movq 16(%esp), %mm0
addl $28, %esp
ret
Yuck!
GCC gives us:
_qux:
subl $12, %esp
movl 16(%esp), %eax
movl 20(%esp), %edx
movl $0, (%eax)
movl %edx, 4(%eax)
addl $12, %esp
ret $4