Changes in directory llvm/lib/Target/X86:
README.txt updated: 1.97 -> 1.98
---
Log message:
Add a new entry.
---
Diffs of the changes: (+32 -0)
README.txt | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+)
Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.97 llvm/lib/Target/X86/README.txt:1.98
--- llvm/lib/Target/X86/README.txt:1.97 Mon Apr 24 12:38:16 2006
+++ llvm/lib/Target/X86/README.txt Mon Apr 24 18:30:10 2006
@@ -1075,3 +1075,35 @@
There is also one case we do worse on PPC.
//===---------------------------------------------------------------------===//
+
+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.
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