Changes in directory llvm/lib/Target/PowerPC:
README.txt updated: 1.100 -> 1.101
---
Log message:
add note
---
Diffs of the changes: (+19 -0)
README.txt | 19 +++++++++++++++++++
1 files changed, 19 insertions(+)
Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.100
llvm/lib/Target/PowerPC/README.txt:1.101
--- llvm/lib/Target/PowerPC/README.txt:1.100 Fri Sep 22 00:01:56 2006
+++ llvm/lib/Target/PowerPC/README.txt Fri Oct 13 15:20:58 2006
@@ -11,6 +11,25 @@
===-------------------------------------------------------------------------===
+Compile:
+
+void foo(int *P) {
+ if (P) *P = 0;
+}
+
+into:
+
+_foo:
+ cmpwi cr0,r3,0
+ beqlr cr0
+ li r0,0
+ stw r0,0(r3)
+ blr
+
+This is effectively a simple form of predication.
+
+===-------------------------------------------------------------------------===
+
Teach the .td file to pattern match PPC::BR_COND to appropriate bc variant, so
we don't have to always run the branch selector for small functions.
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