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7a6aa1a391
exact/nsw/nuw shifts and have instcombine infer them when it can prove that the relevant properties are true for a given shift without them. Also, a variety of refactoring to use the new patternmatch logic thrown in for good luck. I believe that this takes care of a bunch of related code quality issues attached to PR8862. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125267 91177308-0d34-0410-b5e6-96231b3b80d8
14 lines
351 B
LLVM
14 lines
351 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; This cannot be turned into a sign extending cast!
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define i64 @test(i64 %X) {
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%Y = shl i64 %X, 16 ; <i64> [#uses=1]
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; CHECK: %Y = shl i64 %X, 16
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%Z = ashr i64 %Y, 16 ; <i64> [#uses=1]
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; CHECK: %Z = ashr exact i64 %Y, 16
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ret i64 %Z
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; CHECK: ret i64 %Z
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}
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