Changes in directory llvm/lib/Target/X86:
README.txt updated: 1.156 -> 1.157
---
Log message:
add a note
---
Diffs of the changes: (+22 -0)
README.txt | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+)
Index: llvm/lib/Target/X86/README.txt
diff -u llvm/lib/Target/X86/README.txt:1.156
llvm/lib/Target/X86/README.txt:1.157
--- llvm/lib/Target/X86/README.txt:1.156 Mon Feb 12 15:20:26 2007
+++ llvm/lib/Target/X86/README.txt Thu Mar 1 23:04:52 2007
@@ -920,3 +920,25 @@
Though this probably isn't worth it.
//===---------------------------------------------------------------------===//
+
+We need to teach the codegen to convert two-address INC instructions to LEA
+when the flags are dead. For example, on X86-64, compile:
+
+int foo(int A, int B) {
+ return A+1;
+}
+
+to:
+
+_foo:
+ leal 1(%edi), %eax
+ ret
+
+instead of:
+
+_foo:
+ incl %edi
+ movl %edi, %eax
+ ret
+
+//===---------------------------------------------------------------------===//
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