New case to handle someday

llvm-svn: 24075
2005-10-28 23:26:57 +00:00 · 2005-10-28 23:26:57 +00:00 · 00cea9b2e0
parent 742606ad30
commit 00cea9b2e0
1 changed files with 17 additions and 0 deletions
--- a/llvm/lib/Target/PowerPC/README.txt
+++ b/llvm/lib/Target/PowerPC/README.txt
@ -217,5 +217,22 @@ _test:
        stw r2, 0(r3)
        blr

+===-------------------------------------------------------------------------===

+Compile
+int foo(int a) { return a * -2 + 63; }
+
+to
+
+_foo:
+        slwi r0,r3,1
+        subfic r3,r0,63
+        blr
+
+instead of:
+
+_foo:
+        mulli r2,r3,-2
+        addi r3,r2,63
+        blr