Author: lattner
Date: Tue Dec 18 10:48:14 2007
New Revision: 45161
URL: http://llvm.org/viewvc/llvm-project?rev=45161&view=rev
Log:
add an obvious load folding missed optzn.
Modified:
llvm/trunk/lib/Target/X86/README.txt
Modified: llvm/trunk/lib/Target/X86/README.txt
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README.txt?rev=45161&r1=45160&r2=45161&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Tue Dec 18 10:48:14 2007
@@ -1552,3 +1552,24 @@
andl $65535, %eax
ret
+//===---------------------------------------------------------------------===//
+
+We're missing an obvious fold of a load into imul:
+
+int test(long a, long b) { return a * b; }
+
+LLVM produces:
+_test:
+ movl 4(%esp), %ecx
+ movl 8(%esp), %eax
+ imull %ecx, %eax
+ ret
+
+vs:
+_test:
+ movl 8(%esp), %eax
+ imull 4(%esp), %eax
+ ret
+
+//===---------------------------------------------------------------------===//
+
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