[llvm-commits] CVS: llvm/test/Regression/Transforms/LoopStrengthReduce/share_code_in_preheader.ll
Chris Lattner
lattner at cs.uiuc.edu
Sun Aug 7 22:47:02 PDT 2005
Changes in directory llvm/test/Regression/Transforms/LoopStrengthReduce:
share_code_in_preheader.ll added (r1.1)
---
Log message:
It is better to not depend on CSE to share multiplies due to IV insertion.
This testcase checks that only one mul is present in the output code, as it
should be.
---
Diffs of the changes: (+28 -0)
share_code_in_preheader.ll | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+)
Index: llvm/test/Regression/Transforms/LoopStrengthReduce/share_code_in_preheader.ll
diff -c /dev/null llvm/test/Regression/Transforms/LoopStrengthReduce/share_code_in_preheader.ll:1.1
*** /dev/null Mon Aug 8 00:47:01 2005
--- llvm/test/Regression/Transforms/LoopStrengthReduce/share_code_in_preheader.ll Mon Aug 8 00:46:51 2005
***************
*** 0 ****
--- 1,28 ----
+ ; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep mul | wc -l | grep 1
+ ; LSR should not make two copies of the Q*L expression in the preheader!
+
+ sbyte %test(sbyte* %A, sbyte* %B, int %L, int %Q, int %N) {
+ entry:
+ %tmp.6 = mul int %Q, %L ; <int> [#uses=1]
+ %N = cast int %N to uint ; <uint> [#uses=1]
+ br label %no_exit
+
+ no_exit: ; preds = %no_exit, %no_exit.preheader
+ %indvar = phi uint [ 0, %entry], [ %indvar.next, %no_exit ] ; <uint> [#uses=2]
+ %Sum.0.0 = phi sbyte [ 0, %entry], [ %tmp.21, %no_exit ] ; <sbyte> [#uses=1]
+ %indvar = cast uint %indvar to int ; <int> [#uses=1]
+ %N_addr.0.0 = sub int %N, %indvar ; <int> [#uses=1]
+ %tmp.8 = add int %N_addr.0.0, %tmp.6 ; <int> [#uses=2]
+ %tmp.9 = getelementptr sbyte* %A, int %tmp.8 ; <sbyte*> [#uses=1]
+ %tmp.10 = load sbyte* %tmp.9 ; <sbyte> [#uses=1]
+ %tmp.17 = getelementptr sbyte* %B, int %tmp.8 ; <sbyte*> [#uses=1]
+ %tmp.18 = load sbyte* %tmp.17 ; <sbyte> [#uses=1]
+ %tmp.19 = sub sbyte %tmp.10, %tmp.18 ; <sbyte> [#uses=1]
+ %tmp.21 = add sbyte %tmp.19, %Sum.0.0 ; <sbyte> [#uses=2]
+ %indvar.next = add uint %indvar, 1 ; <uint> [#uses=2]
+ %exitcond = seteq uint %indvar.next, %N ; <bool> [#uses=1]
+ br bool %exitcond, label %loopexit, label %no_exit
+
+ loopexit:
+ ret sbyte %tmp.21
+ }
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