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224555f18c
The bug: I missed adding break statements in the switch / case. Original commit message: [SCEV] Teach SCEV some axioms about non-wrapping arithmetic Summary: - A s< (A + C)<nsw> if C > 0 - A s<= (A + C)<nsw> if C >= 0 - (A + C)<nsw> s< A if C < 0 - (A + C)<nsw> s<= A if C <= 0 Right now `C` needs to be a constant, but we can later generalize it to be a non-constant if needed. Reviewers: atrick, hfinkel, reames, nlewycky Subscribers: sanjoy, llvm-commits Differential Revision: http://reviews.llvm.org/D13686 llvm-svn: 252236
31 lines
683 B
LLVM
31 lines
683 B
LLVM
; RUN: opt -S -indvars < %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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declare void @use(i1)
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define void @f(i32 %x) {
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; CHECK-LABEL: @f(
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entry:
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%conv = sext i32 %x to i64
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%sub = add i64 %conv, -1
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%ec = icmp sgt i32 %x, 0
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br i1 %ec, label %loop, label %leave
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loop:
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; CHECK: loop:
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%iv = phi i64 [ 0, %entry ], [ %iv.inc, %loop ]
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%iv.inc = add i64 %iv, 1
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%cmp = icmp slt i64 %iv, %sub
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call void @use(i1 %cmp)
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; CHECK: call void @use(i1 %cmp)
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; CHECK-NOT: call void @use(i1 true)
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%be.cond = icmp slt i64 %iv.inc, %conv
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br i1 %be.cond, label %loop, label %leave
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leave:
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ret void
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}
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