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a note

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34670 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-27 17:21:09 +00:00
parent 84da80d10b
commit dbec2d9dcf
1 changed files with 42 additions and 0 deletions
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42
lib/Target/X86/README-SSE.txt
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@ -530,3 +530,45 @@ to loads from constant pool.
Floating point max / min are commutable when -enable-unsafe-fp-path is
specified. We should turn int_x86_sse_max_ss and X86ISD::FMIN etc. into other
nodes which are selected to max / min instructions that are marked commutable.
//===---------------------------------------------------------------------===//
We should compile this:
#include <xmmintrin.h>
typedef union {
int i[4];
float f[4];
__m128 v;
} vector4_t;
void swizzle (const void *a, vector4_t * b, vector4_t * c) {
b->v = _mm_loadl_pi (b->v, (__m64 *) a);
c->v = _mm_loadl_pi (c->v, ((__m64 *) a) + 1);
}
to:
_swizzle:
movl 4(%esp), %eax
movl 8(%esp), %edx
movl 12(%esp), %ecx
movlps (%eax), %xmm0
movlps %xmm0, (%edx)
movlps 8(%eax), %xmm0
movlps %xmm0, (%ecx)
ret
not:
swizzle:
movl 8(%esp), %eax
movaps (%eax), %xmm0
movl 4(%esp), %ecx
movlps (%ecx), %xmm0
movaps %xmm0, (%eax)
movl 12(%esp), %eax
movaps (%eax), %xmm0
movlps 8(%ecx), %xmm0
movaps %xmm0, (%eax)
ret