Author: void
Date: Tue Oct 2 14:55:05 2007
New Revision: 42542
URL: http://llvm.org/viewvc/llvm-project?rev=42542&view=rev
Log:
Micro-optimization -- missed LICM opportunity.
Modified:
llvm/trunk/lib/Target/X86/README-SSE.txt
Modified: llvm/trunk/lib/Target/X86/README-SSE.txt
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README-SSE.txt?rev=42542&r1=42541&r2=42542&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README-SSE.txt (original)
+++ llvm/trunk/lib/Target/X86/README-SSE.txt Tue Oct 2 14:55:05 2007
@@ -671,3 +671,27 @@
//===---------------------------------------------------------------------===//
+In this loop:
+
+LBB4_6: # bb47.preheader
+ shlw $2, %si
+ decw %si
+ movzwl %si, %eax
+ incl %eax
+ xorl %ecx, %ecx
+LBB4_7: # bb47
+ xorps %xmm0, %xmm0 # (1)
+ movaps %xmm0, (%edx)
+ movaps %xmm0, 16(%edx)
+ addl $32, %edx
+ incl %ecx
+ cmpl %eax, %ecx
+ jne LBB4_7 # bb47
+LBB4_8: # bb42.return_crit_edge
+ xorw %si, %si
+ jmp LBB4_12 # return
+
+The instruction at (1) can be moved out of the main body of the loop.
+
+//===---------------------------------------------------------------------===//
+
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