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0f4b285a5b
(x pred y) with more thorough code that does more complete canonicalization before resorting to range checks. This helps it find more cases where the canonicalized expressions match. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76671 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \
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; RUN: | grep {Loop for\\.body: backedge-taken count is (-1 + \[%\]ecx)}
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; PR4599
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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define i32 @foo(i32 %ecx) nounwind {
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entry:
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%cmp2 = icmp eq i32 %ecx, 0 ; <i1> [#uses=1]
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br i1 %cmp2, label %for.end, label %bb.nph
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for.cond: ; preds = %for.inc
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%cmp = icmp ult i32 %inc, %ecx ; <i1> [#uses=1]
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br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
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for.cond.for.end_crit_edge: ; preds = %for.cond
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%phitmp = add i32 %i.01, 2 ; <i32> [#uses=1]
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br label %for.end
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bb.nph: ; preds = %entry
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br label %for.body
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for.body: ; preds = %bb.nph, %for.cond
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%i.01 = phi i32 [ %inc, %for.cond ], [ 0, %bb.nph ] ; <i32> [#uses=3]
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%call = call i32 @bar(i32 %i.01) nounwind ; <i32> [#uses=0]
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br label %for.inc
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for.inc: ; preds = %for.body
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%inc = add i32 %i.01, 1 ; <i32> [#uses=2]
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br label %for.cond
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for.end: ; preds = %for.cond.for.end_crit_edge, %entry
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%i.0.lcssa = phi i32 [ %phitmp, %for.cond.for.end_crit_edge ], [ 1, %entry ] ; <i32> [#uses=1]
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ret i32 %i.0.lcssa
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}
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declare i32 @bar(i32)
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