Changes in directory llvm/lib/Target/PowerPC:
README.txt updated: 1.85 -> 1.86
---
Log message:
New note, Nate, please check to see if I'm full of it :)
---
Diffs of the changes: (+33 -0)
README.txt | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+)
Index: llvm/lib/Target/PowerPC/README.txt
diff -u llvm/lib/Target/PowerPC/README.txt:1.85
llvm/lib/Target/PowerPC/README.txt:1.86
--- llvm/lib/Target/PowerPC/README.txt:1.85 Thu Apr 13 11:48:00 2006
+++ llvm/lib/Target/PowerPC/README.txt Fri May 5 00:36:15 2006
@@ -559,3 +559,36 @@
// need to flag these together so that the value isn't live across a call.
//setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
+===-------------------------------------------------------------------------===
+
+Another missed rlwimi case:
+
+void %foo(uint *%tmp) {
+ %tmp = load uint* %tmp ; <uint> [#uses=3]
+ %tmp1 = shr uint %tmp, ubyte 31 ; <uint> [#uses=1]
+ %tmp1 = cast uint %tmp1 to ubyte ; <ubyte> [#uses=1]
+ %tmp4.mask = shr uint %tmp, ubyte 30 ; <uint> [#uses=1]
+ %tmp4.mask = cast uint %tmp4.mask to ubyte ; <ubyte>
[#uses=1]
+ %tmp = or ubyte %tmp4.mask, %tmp1 ; <ubyte> [#uses=1]
+ %tmp10 = cast ubyte %tmp to uint ; <uint> [#uses=1]
+ %tmp11 = shl uint %tmp10, ubyte 31 ; <uint> [#uses=1]
+ %tmp12 = and uint %tmp, 2147483647 ; <uint> [#uses=1]
+ %tmp13 = or uint %tmp11, %tmp12 ; <uint> [#uses=1]
+ store uint %tmp13, uint* %tmp
+ ret void
+}
+
+We emit:
+
+_foo:
+ lwz r2, 0(r3)
+ srwi r4, r2, 30
+ srwi r5, r2, 31
+ or r4, r4, r5
+ slwi r4, r4, 31
+ rlwimi r4, r2, 0, 1, 31
+ stw r4, 0(r3)
+ blr
+
+I *think* that could use another rlwimi.
+
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