[llvm-commits] CVS: llvm/test/Regression/Transforms/LoopStrengthReduce/use_postinc_value_outside_loop.ll

[Chris Lattner]

Changes in directory llvm/test/Regression/Transforms/LoopStrengthReduce:

use_postinc_value_outside_loop.ll added (r1.1)
---
Log message:

new testcase


---
Diffs of the changes:  (+28 -0)

 use_postinc_value_outside_loop.ll |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+)


Index: llvm/test/Regression/Transforms/LoopStrengthReduce/use_postinc_value_outside_loop.ll
diff -c /dev/null llvm/test/Regression/Transforms/LoopStrengthReduce/use_postinc_value_outside_loop.ll:1.1
*** /dev/null	Mon Sep 12 00:50:25 2005
--- llvm/test/Regression/Transforms/LoopStrengthReduce/use_postinc_value_outside_loop.ll	Mon Sep 12 00:50:15 2005
***************
*** 0 ****
--- 1,28 ----
+ ; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep 'add uint %iv..inc, 1'
+ ;
+ ; Make sure that the use of the IV outside of the loop (the store) uses the 
+ ; post incremented value of the IV, not the preincremented value.  This 
+ ; prevents the loop from having to keep the post and pre-incremented value
+ ; around for the duration of the loop, adding a copy and an extra register
+ ; to the loop.
+ 
+ declare bool %pred(int %X)
+ 
+ void %test([700 x int]* %nbeaux_.0__558, int* %i_.16574) {
+ then.0:
+         br label %no_exit.2
+ 
+ no_exit.2:              ; preds = %no_exit.2, %then.0
+         %indvar630 = phi uint [ 0, %then.0 ], [ %indvar.next631, %no_exit.2 ]           ; <uint> [#uses=3]
+         %indvar630 = cast uint %indvar630 to int                ; <int> [#uses=1]
+         %tmp.38 = getelementptr [700 x int]* %nbeaux_.0__558, int 0, uint %indvar630            ; <int*> [#uses=1]
+         store int 0, int* %tmp.38
+         %inc.2 = add int %indvar630, 2          ; <int> [#uses=2]
+         %tmp.34 = call bool %pred(int %indvar630)
+         %indvar.next631 = add uint %indvar630, 1                ; <uint> [#uses=1]
+         br bool %tmp.34, label %no_exit.2, label %loopexit.2.loopexit
+ 
+ loopexit.2.loopexit:            ; preds = %no_exit.2
+         store int %inc.2, int* %i_.16574
+         ret void
+ }