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[InstCombine] Allow InstrCombine to remove one of adjacent guards if they are equivalent

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This is a partial fix for Bug 31520 - [guards] canonicalize guards in instcombine

Reviewed By: majnemer, apilipenko

Differential Revision: https://reviews.llvm.org/D29071

Patch by Maxim Kazantsev.

llvm-svn: 293056
This commit is contained in:
Artur Pilipenko 2017-01-25 14:12:12 +00:00
parent cb8becd477
commit 8d5f1040c3
2 changed files with 40 additions and 0 deletions
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10
lib/Transforms/InstCombine/InstCombineCalls.cpp
View File

@ -2870,6 +2870,16 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// TODO: relocate((gep p, C, C2, ...)) -> gep(relocate(p), C, C2, ...)
break;
}
case Intrinsic::experimental_guard: {
Value *IIOperand = II->getArgOperand(0);
// Remove a guard if it is immediately followed by an identical guard.
if (match(II->getNextNode(),
m_Intrinsic<Intrinsic::experimental_guard>(m_Specific(IIOperand))))
return eraseInstFromFunction(*II);
break;
}
}
return visitCallSite(II);

30
test/Transforms/InstCombine/call-guard.ll Normal file
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@ -0,0 +1,30 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
declare void @llvm.experimental.guard(i1, ...)
define void @test_guard_adjacent(i1 %A) {
; CHECK-LABEL: @test_guard_adjacent(
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %A) [ "deopt"() ]
; CHECK-NEXT: ret void
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
ret void
}
define void @test_guard_adjacent_neg(i1 %A, i1 %B) {
; CHECK-LABEL: @test_guard_adjacent_neg(
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %A) [ "deopt"() ]
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 %B) [ "deopt"() ]
; CHECK-NEXT: ret void
call void(i1, ...) @llvm.experimental.guard( i1 %A )[ "deopt"() ]
call void(i1, ...) @llvm.experimental.guard( i1 %B )[ "deopt"() ]
ret void
}