d894fb4288
When we optimize select basing on fact that div by 0 is undef we should not traverse the instruction which are not guaranteed to transfer execution to next instruction. Guard intrinsic is an example. Reviewers: spatel, craig.topper Reviewed By: spatel Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D47576 llvm-svn: 333864
21 lines
787 B
LLVM
21 lines
787 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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declare void @llvm.experimental.guard(i1, ...)
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; Regression test. If %flag is false then %s == 0 and guard should be triggered.
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define i32 @a(i1 %flag, i32 %X) nounwind readnone {
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; CHECK-LABEL: @a(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ne i32 [[X:%.*]], 0
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; CHECK-NEXT: [[CMP:%.*]] = and i1 [[CMP1]], [[FLAG:%.*]]
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[CMP]]) #1 [ "deopt"() ]
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; CHECK-NEXT: [[R:%.*]] = sdiv i32 100, [[X]]
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; CHECK-NEXT: ret i32 [[R]]
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;
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%s = select i1 %flag, i32 %X, i32 0
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%cmp = icmp ne i32 %s, 0
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call void(i1, ...) @llvm.experimental.guard( i1 %cmp )[ "deopt"() ]
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%r = sdiv i32 100, %s
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ret i32 %r
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}
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