forked from OSchip/llvm-project
31 lines
722 B
LLVM
31 lines
722 B
LLVM
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; RUN: opt -indvars -S < %s | FileCheck %s
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declare void @use(i32)
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declare void @use.i8(i8)
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define void @f() {
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; CHECK-LABEL: @f
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entry:
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br label %loop
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loop:
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; The only use for idx.mirror is to induce an nuw for %idx. It does
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; not induce an nuw for %idx.inc
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%idx.mirror = phi i8 [ -6, %entry ], [ %idx.mirror.inc, %loop ]
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%idx = phi i8 [ -5, %entry ], [ %idx.inc, %loop ]
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%idx.sext = sext i8 %idx to i32
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call void @use(i32 %idx.sext)
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%idx.mirror.inc = add nuw i8 %idx.mirror, 1
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call void @use.i8(i8 %idx.mirror.inc)
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%idx.inc = add i8 %idx, 1
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; CHECK-NOT: %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
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%cmp = icmp ugt i8 %idx.inc, 0
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br i1 %cmp, label %loop, label %exit
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exit:
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ret void
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}
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