mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 03:02:36 +01:00
6aa37cb0b7
Summary: The function is meant to recurse until it comes upon the phi it's looking for. However, with the current condition, it will recurse until it finds anything _but_ the phi. The function will even fail for simple cases like: %i = phi i32 [ %inc, %loop ], ... ... %inc = add i32 %i, 1 because the base condition will not happen when the phi is recursed to, and the recursion will end with a 'false' result since the previous instruction is a phi. Reviewers: sanjoy, atrick Reviewed By: sanjoy Subscribers: Ka-Ka, bjope, llvm-commits Committing on behalf of: Bevin Hansson (bevinh) Differential Revision: https://reviews.llvm.org/D40946 llvm-svn: 320700
64 lines
1.9 KiB
LLVM
64 lines
1.9 KiB
LLVM
; RUN: opt -indvars -S < %s | FileCheck %s
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define i32 @fn() {
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entry:
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ret i32 10
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}
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define i32 @test_nested2(i32 %tnr) {
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; CHECK-LABEL: test_nested2
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; CHECK-NOT: %indvars.iv
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; CHECK: %i.0
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; indvars should not replace the i.0 variable with a new one; SCEVExpander
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; should determine that the old one is good to reuse.
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entry:
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%res = alloca i32, align 4
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store volatile i32 0, i32* %res, align 4
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%call = call i32 @fn()
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br label %for.cond
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for.cond: ; preds = %for.inc6, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc7, %for.inc6 ]
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%cmp = icmp slt i32 %i.0, %call
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br i1 %cmp, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond
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br label %for.end8
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for.body: ; preds = %for.cond
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br label %for.cond1
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for.cond1: ; preds = %for.inc, %for.body
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%j.0 = phi i32 [ 0, %for.body ], [ %inc5, %for.inc ]
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%cmp2 = icmp slt i32 %j.0, %i.0
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br i1 %cmp2, label %for.body4, label %for.cond.cleanup3
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for.cond.cleanup3: ; preds = %for.cond1
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br label %for.end
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for.body4: ; preds = %for.cond1
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%0 = load volatile i32, i32* %res, align 4
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%inc = add nsw i32 %0, 1
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store volatile i32 %inc, i32* %res, align 4
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br label %for.inc
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for.inc: ; preds = %for.body4
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%inc5 = add nsw i32 %j.0, 1
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br label %for.cond1
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for.end: ; preds = %for.cond.cleanup3
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br label %for.inc6
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for.inc6: ; preds = %for.end
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%inc7 = add nsw i32 %i.0, 1
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br label %for.cond
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for.end8: ; preds = %for.cond.cleanup
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%1 = load volatile i32, i32* %res, align 4
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%cmp9 = icmp eq i32 %1, 45
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%conv = zext i1 %cmp9 to i32
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ret i32 %conv
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}
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