Changes in directory llvm/lib/Target/PowerPC:
README.txt updated: 1.94 -> 1.95
---
Log message:
add a note
---
Diffs of the changes: (+25 -0)
README.txt | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+)
Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.94
llvm/lib/Target/PowerPC/README.txt:1.95
--- llvm/lib/Target/PowerPC/README.txt:1.94 Thu Jul 13 23:07:29 2006
+++ llvm/lib/Target/PowerPC/README.txt Thu Sep 14 15:56:30 2006
@@ -539,3 +539,28 @@
unsigned short G;
void foo(unsigned long H) { G = H; }
+===-------------------------------------------------------------------------===
+
+We compile:
+
+unsigned test6(unsigned x) {
+ return ((x & 0x00FF0000) >> 16) | ((x & 0x000000FF) << 16);
+}
+
+into:
+
+_test6:
+ lis r2, 255
+ rlwinm r3, r3, 16, 0, 31
+ ori r2, r2, 255
+ and r3, r3, r2
+ blr
+
+GCC gets it down to:
+
+_test6:
+ rlwinm r0,r3,16,8,15
+ rlwinm r3,r3,16,24,31
+ or r3,r3,r0
+ blr
+
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