Changes in directory llvm/lib/Target/PowerPC:
README.txt updated: 1.104 -> 1.105
---
Log message:
add note about ugly codegen with preinc
---
Diffs of the changes: (+29 -0)
README.txt | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+)
Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.104
llvm/lib/Target/PowerPC/README.txt:1.105
--- llvm/lib/Target/PowerPC/README.txt:1.104 Tue Nov 7 12:30:21 2006
+++ llvm/lib/Target/PowerPC/README.txt Thu Nov 9 19:33:53 2006
@@ -9,6 +9,35 @@
Support 'update' load/store instructions. These are cracked on the G5, but are
still a codesize win.
+With preinc enabled, this:
+
+long *%test4(long *%X, long *%dest) {
+ %Y = getelementptr long* %X, int 4
+ %A = load long* %Y
+ store long %A, long* %dest
+ ret long* %Y
+}
+
+compiles to:
+
+_test4:
+ mr r2, r3
+ lwzu r5, 32(r2)
+ lwz r3, 36(r3)
+ stw r5, 0(r4)
+ stw r3, 4(r4)
+ mr r3, r2
+ blr
+
+with -sched=list-burr, I get:
+
+_test4:
+ lwz r2, 36(r3)
+ lwzu r5, 32(r3)
+ stw r2, 4(r4)
+ stw r5, 0(r4)
+ blr
+
===-------------------------------------------------------------------------===
We compile the hottest inner loop of viterbi to:
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