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llvm-mirror/test/Regression/Transforms/LoopStrengthReduce/dont_reduce_bytes.ll
Chris Lattner 0f34140f90 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.

llvm-svn: 20502
2005-03-06 22:15:24 +00:00

22 lines
568 B
LLVM

; 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
}