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c88238ea77
This patch makes Scalarizer to use poison as insertelement's placeholder. It contains two changes in Scalarizer.cpp, and the both changes does not change the semantics of the optimized program. It is because the placeholder value (poison) is already completely hidden by following insertelement instructions. The first change at visitBitCastInst() creates poison vector of MidTy and consecutively inserts FanIn times, which is # of elems of MidTy. The second change at ScalarizerVisitor::finish() creates poison with Op->getType(), and it is filled with Count insertelements. The test diffs show that the poison value is never exposed after insertelements. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D93989
77 lines
3.8 KiB
LLVM
77 lines
3.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt %s -scalarizer -scalarize-load-store -S | FileCheck %s
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; RUN: opt %s -passes='function(scalarizer)' -scalarize-load-store -S | FileCheck %s
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; This verifies that the order of extract element instructions is
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; deterministic. In the past we could end up with different results depending
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; on the compiler used (due to argument evaluation order being undefined in
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; C++). The order of the extracts is not really important for correctness of
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; the result, but when debugging and creating test cases it is helpful if we
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; get the same out put regardless of which compiler we use when building the
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; compiler.
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define <2 x i32> @test1(i1 %b, <2 x i32> %i, <2 x i32> %j) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[I_I0:%.*]] = extractelement <2 x i32> [[I:%.*]], i32 0
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; CHECK-NEXT: [[J_I0:%.*]] = extractelement <2 x i32> [[J:%.*]], i32 0
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; CHECK-NEXT: [[RES_I0:%.*]] = select i1 [[B:%.*]], i32 [[I_I0]], i32 [[J_I0]]
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; CHECK-NEXT: [[I_I1:%.*]] = extractelement <2 x i32> [[I]], i32 1
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; CHECK-NEXT: [[J_I1:%.*]] = extractelement <2 x i32> [[J]], i32 1
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; CHECK-NEXT: [[RES_I1:%.*]] = select i1 [[B]], i32 [[I_I1]], i32 [[J_I1]]
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; CHECK-NEXT: [[RES_UPTO0:%.*]] = insertelement <2 x i32> poison, i32 [[RES_I0]], i32 0
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; CHECK-NEXT: [[RES:%.*]] = insertelement <2 x i32> [[RES_UPTO0]], i32 [[RES_I1]], i32 1
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; CHECK-NEXT: ret <2 x i32> [[RES]]
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;
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%res = select i1 %b, <2 x i32> %i, <2 x i32> %j
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ret <2 x i32> %res
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}
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define <2 x i32> @test2(<2 x i1> %b, <2 x i32> %i, <2 x i32> %j) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[B_I0:%.*]] = extractelement <2 x i1> [[B:%.*]], i32 0
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; CHECK-NEXT: [[I_I0:%.*]] = extractelement <2 x i32> [[I:%.*]], i32 0
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; CHECK-NEXT: [[J_I0:%.*]] = extractelement <2 x i32> [[J:%.*]], i32 0
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; CHECK-NEXT: [[RES_I0:%.*]] = select i1 [[B_I0]], i32 [[I_I0]], i32 [[J_I0]]
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; CHECK-NEXT: [[B_I1:%.*]] = extractelement <2 x i1> [[B]], i32 1
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; CHECK-NEXT: [[I_I1:%.*]] = extractelement <2 x i32> [[I]], i32 1
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; CHECK-NEXT: [[J_I1:%.*]] = extractelement <2 x i32> [[J]], i32 1
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; CHECK-NEXT: [[RES_I1:%.*]] = select i1 [[B_I1]], i32 [[I_I1]], i32 [[J_I1]]
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; CHECK-NEXT: [[RES_UPTO0:%.*]] = insertelement <2 x i32> poison, i32 [[RES_I0]], i32 0
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; CHECK-NEXT: [[RES:%.*]] = insertelement <2 x i32> [[RES_UPTO0]], i32 [[RES_I1]], i32 1
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; CHECK-NEXT: ret <2 x i32> [[RES]]
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;
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%res = select <2 x i1> %b, <2 x i32> %i, <2 x i32> %j
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ret <2 x i32> %res
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}
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define <2 x i32> @test3(<2 x i32> %i, <2 x i32> %j) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[I_I0:%.*]] = extractelement <2 x i32> [[I:%.*]], i32 0
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; CHECK-NEXT: [[J_I0:%.*]] = extractelement <2 x i32> [[J:%.*]], i32 0
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; CHECK-NEXT: [[RES_I0:%.*]] = add nuw nsw i32 [[I_I0]], [[J_I0]]
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; CHECK-NEXT: [[I_I1:%.*]] = extractelement <2 x i32> [[I]], i32 1
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; CHECK-NEXT: [[J_I1:%.*]] = extractelement <2 x i32> [[J]], i32 1
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; CHECK-NEXT: [[RES_I1:%.*]] = add nuw nsw i32 [[I_I1]], [[J_I1]]
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; CHECK-NEXT: [[RES_UPTO0:%.*]] = insertelement <2 x i32> poison, i32 [[RES_I0]], i32 0
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; CHECK-NEXT: [[RES:%.*]] = insertelement <2 x i32> [[RES_UPTO0]], i32 [[RES_I1]], i32 1
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; CHECK-NEXT: ret <2 x i32> [[RES]]
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;
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%res = add nuw nsw <2 x i32> %i, %j
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ret <2 x i32> %res
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}
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define void @test4(<2 x i32>* %ptr, <2 x i32> %val) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[VAL_I0:%.*]] = extractelement <2 x i32> [[VAL:%.*]], i32 0
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; CHECK-NEXT: [[PTR_I0:%.*]] = bitcast <2 x i32>* [[PTR:%.*]] to i32*
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; CHECK-NEXT: store i32 [[VAL_I0]], i32* [[PTR_I0]], align 8
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; CHECK-NEXT: [[VAL_I1:%.*]] = extractelement <2 x i32> [[VAL]], i32 1
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; CHECK-NEXT: [[PTR_I1:%.*]] = getelementptr i32, i32* [[PTR_I0]], i32 1
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; CHECK-NEXT: store i32 [[VAL_I1]], i32* [[PTR_I1]], align 4
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; CHECK-NEXT: ret void
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;
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store <2 x i32> %val, <2 x i32> *%ptr
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ret void
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}
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