This is done.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51526 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-05-24 00:10:13 +00:00
parent ef1ba3844d
commit fe5b159ae2

View File

@ -382,52 +382,6 @@ elements are fixed zeros.
//===---------------------------------------------------------------------===//
For this:
#include <emmintrin.h>
void test(__m128d *r, __m128d *A, double B) {
*r = _mm_loadl_pd(*A, &B);
}
We generates:
subl $12, %esp
movsd 24(%esp), %xmm0
movsd %xmm0, (%esp)
movl 20(%esp), %eax
movapd (%eax), %xmm0
movlpd (%esp), %xmm0
movl 16(%esp), %eax
movapd %xmm0, (%eax)
addl $12, %esp
ret
icc generates:
movl 4(%esp), %edx #3.6
movl 8(%esp), %eax #3.6
movapd (%eax), %xmm0 #4.22
movlpd 12(%esp), %xmm0 #4.8
movapd %xmm0, (%edx) #4.3
ret #5.1
So icc is smart enough to know that B is in memory so it doesn't load it and
store it back to stack.
This should be fixed by eliminating the llvm.x86.sse2.loadl.pd intrinsic,
lowering it to a load+insertelement instead. Already match the load+shuffle
as movlpd, so this should be easy. We already get optimal code for:
define void @test2(<2 x double>* %r, <2 x double>* %A, double %B) {
entry:
%tmp2 = load <2 x double>* %A, align 16
%tmp8 = insertelement <2 x double> %tmp2, double %B, i32 0
store <2 x double> %tmp8, <2 x double>* %r, align 16
ret void
}
//===---------------------------------------------------------------------===//
__m128d test1( __m128d A, __m128d B) {
return _mm_shuffle_pd(A, B, 0x3);
}