[llvm-commits] CVS: llvm/lib/Target/X86/README.txt

[Chris Lattner]

Changes in directory llvm/lib/Target/X86:

README.txt updated: 1.156 -> 1.157
---
Log message:

add a note


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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
+
+//===---------------------------------------------------------------------===//