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Add a testcase for r135123.

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Part of rdar://9761830

llvm-svn: 135133
This commit is contained in:
Eric Christopher 2011-07-14 06:23:09 +00:00
parent bd1cea5fe4
commit be21240f6f
1 changed files with 14 additions and 0 deletions
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14
test/CodeGen/ARM/fold-const.ll Normal file
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; RUN: llc < %s -march=arm -mattr=+v7 | FileCheck %s
define i32 @f(i32 %a) nounwind readnone optsize ssp {
entry:
%conv = zext i32 %a to i64
%tmp1 = tail call i64 @llvm.ctlz.i64(i64 %conv)
; CHECK: clz
; CHECK-NOT: adds
%cast = trunc i64 %tmp1 to i32
%sub = sub nsw i32 63, %cast
ret i32 %sub
}
declare i64 @llvm.ctlz.i64(i64) nounwind readnone