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19e3905d51
Resolve Bug 27046 (https://llvm.org/bugs/show_bug.cgi?id=27046). The PPCInstrInfo::optimizeCompareInstr function could create a new use of CR0, even if CR0 were previously dead. This patch marks CR0 live if a use of CR0 is created. Author: Tom Jablin (tjablin) Reviewers: hfinkel kbarton cycheng http://reviews.llvm.org/D18884 llvm-svn: 266040
24 lines
547 B
LLVM
24 lines
547 B
LLVM
; RUN: llc -print-before=peephole-opts -print-after=peephole-opts -mtriple=powerpc64-unknown-linux-gnu -o /dev/null 2>&1 < %s | FileCheck %s
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define signext i32 @fn1(i32 %baz) {
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%1 = mul nsw i32 %baz, 208
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%2 = zext i32 %1 to i64
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%3 = shl i64 %2, 48
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%4 = ashr exact i64 %3, 48
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; CHECK: ANDIo8 {{[^,]+}}, 65520, %CR0<imp-def,dead>;
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; CHECK: CMPLDI
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; CHECK: BCC
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; CHECK: ANDIo8 {{[^,]+}}, 65520, %CR0<imp-def>;
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; CHECK: COPY %CR0
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; CHECK: BCC
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%5 = icmp eq i64 %4, 0
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br i1 %5, label %foo, label %bar
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foo:
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ret i32 1
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bar:
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ret i32 0
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}
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