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

[Chris Lattner]

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

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

Add testcase for this:

(3) Do not reduce element sizes of small power of two:

  char s[10];
  for (i)
    ...s[i] ...

when the indvar is not eliminable.



---
Diffs of the changes:  (+21 -0)

 dont_reduce_bytes.ll |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+)


Index: llvm/test/Regression/Transforms/LoopStrengthReduce/dont_reduce_bytes.ll
diff -c /dev/null llvm/test/Regression/Transforms/LoopStrengthReduce/dont_reduce_bytes.ll:1.1
*** /dev/null	Sun Mar  6 16:15:34 2005
--- llvm/test/Regression/Transforms/LoopStrengthReduce/dont_reduce_bytes.ll	Sun Mar  6 16:15:24 2005
***************
*** 0 ****
--- 1,21 ----
+ ; Don't reduce the byte access to P[i], at least not on targets that 
+ ; support an efficient 'mem[r1+r2]' addressing mode.
+ 
+ ; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep 'getelementptr.*PTR.*INDVAR'
+ 
+ declare bool %pred(int)
+ 
+ void %test(sbyte* %PTR) {
+ 	br label %Loop
+ Loop:
+ 	%INDVAR = phi int [0, %0], [%INDVAR2, %Loop]
+ 
+ 	%STRRED = getelementptr sbyte* %PTR, int %INDVAR
+ 	store sbyte 0, sbyte* %STRRED
+ 
+ 	%INDVAR2 = add int %INDVAR, 1
+ 	%cond = call bool %pred(int %INDVAR2)  ;; cannot eliminate indvar
+ 	br bool %cond, label %Loop, label %Out
+ Out:
+ 	ret void
+ }