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1fbffe0cef
time applying to the implicit comparison in smin expressions. The correct way to transform an inequality into the opposite inequality, either signed or unsigned, is with a not expression. I looked through the SCEV code, and I don't think there are any more occurrences of this issue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54194 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
831 B
LLVM
25 lines
831 B
LLVM
; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \
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; RUN: -scalar-evolution-max-iterations=0 | \
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; RUN: grep -F "( -2147483632 + ( 2147483632 smax ( -1 + ( -1 * %x)) smax ( -1 + ( -1 * %y)))) iterations"
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; PR2607
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define i32 @b(i32 %x, i32 %y) {
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entry:
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%cmp2 = icmp slt i32 %y, %x
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%cond3 = select i1 %cmp2, i32 %y, i32 %x
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%cmp54 = icmp slt i32 %cond3, -2147483632
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br i1 %cmp54, label %forinc, label %afterfor
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forinc: ; preds = %forinc, %entry
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%j.01 = phi i32 [ %dec, %forinc ], [ -2147483632, %entry ]
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%dec = add i32 %j.01, -1
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%cmp = icmp slt i32 %y, %x
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%cond = select i1 %cmp, i32 %y, i32 %x
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%cmp5 = icmp sgt i32 %dec, %cond
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br i1 %cmp5, label %forinc, label %afterfor
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afterfor: ; preds = %forinc, %entry
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%j.0.lcssa = phi i32 [ -2147483632, %entry ], [ %dec, %forinc ]
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ret i32 %j.0.lcssa
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}
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