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2460f90c19
Do not tail duplicate blocks where the successor has a phi node, and the corresponding value in that phi node uses a subregister. http://reviews.llvm.org/D13922 llvm-svn: 250877
29 lines
700 B
LLVM
29 lines
700 B
LLVM
; RUN: llc -march=hexagon -O2 -disable-cgp < %s
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; REQUIRES: asserts
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;
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; Tail duplication can ignore subregister information on PHI nodes, and as
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; a result, generate COPY instructions between registers of different classes.
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; This could lead to HexagonInstrInfo::copyPhysReg aborting on an unhandled
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; src/dst combination.
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;
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define i32 @foo(i32 %x, i64 %y) nounwind {
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entry:
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%a = icmp slt i32 %x, 0
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%lo = trunc i64 %y to i32
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br i1 %a, label %next, label %tail
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tail:
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br label %join
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next:
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%c = icmp eq i32 %x, 0
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br i1 %c, label %b1, label %tail
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b1:
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%t1 = lshr i64 %y, 32
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%hi = trunc i64 %t1 to i32
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br label %join
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join:
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%val = phi i32 [ %hi, %b1 ], [ %lo, %tail ]
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ret i32 %val
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}
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