Changes in directory llvm/lib/Target/PowerPC:
README.txt updated: 1.108 -> 1.109
---
Log message:
A relatively simple PPC optimization.
---
Diffs of the changes: (+27 -0)
README.txt | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+)
Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.108
llvm/lib/Target/PowerPC/README.txt:1.109
--- llvm/lib/Target/PowerPC/README.txt:1.108 Mon Jan 29 15:21:22 2007
+++ llvm/lib/Target/PowerPC/README.txt Wed Jan 31 13:49:20 2007
@@ -595,3 +595,30 @@
it.
===-------------------------------------------------------------------------===
+
+We compile this:
+int test(_Bool X) {
+ return X ? 524288 : 0;
+}
+
+to:
+_test:
+ cmplwi cr0, r3, 0
+ lis r2, 8
+ li r3, 0
+ beq cr0, LBB1_2 ;entry
+LBB1_1: ;entry
+ mr r3, r2
+LBB1_2: ;entry
+ blr
+
+instead of:
+_test:
+ addic r2,r3,-1
+ subfe r0,r2,r3
+ slwi r3,r0,19
+ blr
+
+This sort of thing occurs a lot due to globalopt.
+
+===-------------------------------------------------------------------------===
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