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ac9dc6f8fc
If the block being cloned contains a PHI node, in general, we need to clone that PHI node, even though it's trivial. If the operand of the PHI is an instruction in the block being cloned, the correct value for the operand doesn't exist until SSAUpdater constructs it. We usually don't hit this issue because we try to avoid threading across loop headers, but it's possible to hit this in some cases involving irreducible CFGs. I added a flag to allow threading across loop headers to make the testcase easier to understand. Thanks to Brian Rzycki for reducing the testcase. Fixes https://bugs.llvm.org/show_bug.cgi?id=42085. Differential Revision: https://reviews.llvm.org/D63913 llvm-svn: 365094
42 lines
1.5 KiB
LLVM
42 lines
1.5 KiB
LLVM
; RUN: opt < %s -jump-threading -S -jump-threading-across-loop-headers | FileCheck %s
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; Make sure we correctly distinguish between %tmp15 and %tmp16 when we clone
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; body2.
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; CHECK: body2.thread:
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; CHECK-NEXT: %tmp163 = add i32 %tmp165, 1
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; CHECK-NEXT: br label %latch1
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; CHECK: latch1:
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; CHECK-NEXT: %tmp165 = phi i32 [ %tmp163, %body2.thread ], [ %tmp16, %body2 ]
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; CHECK-NEXT: %tmp154 = phi i32 [ %tmp165, %body2.thread ], [ %tmp15, %body2 ]
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define i32 @test(i1 %ARG1, i1 %ARG2, i32 %n) {
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entry:
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br label %head1
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head1: ; preds = %entry, %body1
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%tmp = phi i32 [ 0, %entry ], [ %tmp16, %body1 ]
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%tmp3 = phi i32 [ 0, %entry ], [ %tmp16, %body1 ]
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%tmp4 = phi i32 [ 0, %entry ], [ %tmp16, %body1 ]
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br i1 %ARG1, label %exit, label %body2
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body1: ; preds = %latch1
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%tmp12 = icmp sgt i32 %tmp16, 1
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br i1 %tmp12, label %body2, label %head1
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body2: ; preds = %head1, %body1
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%tmp14 = phi i32 [ %tmp16, %body1 ], [ %tmp, %head1 ]
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%tmp15 = phi i32 [ %tmp16, %body1 ], [ %tmp3, %head1 ]
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%tmp16 = add i32 %tmp14, 1
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br i1 %ARG2, label %exit, label %latch1
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latch1: ; preds = %body2
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%tmp18 = icmp sgt i32 %tmp16, %n
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br i1 %tmp18, label %exit, label %body1
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exit: ; preds = %latch1, %body2, %head1
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%rc = phi i32 [ %tmp15, %body2 ], [ %tmp15, %latch1 ], [ -1, %head1 ]
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ret i32 %rc
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}
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