9ca2c309ab
We can only fold insertvalue undef, (extractvalue x, n) to x if x is not poison, otherwise we might be replacing undef with poison (https://alive2.llvm.org/ce/z/fnw3c8). The insertvalue poison case is always fine. I didn't go to particularly large effort to preserve cases where folding with undef is still legal (mainly when there is a chain of multiple inserts that end up covering the whole aggregate), because this shouldn't really occur in practice: We should always be generating the insertvalue poison form when constructing aggregates nowadays. Differential Revision: https://reviews.llvm.org/D144106
72 lines
2.2 KiB
LLVM
72 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
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declare void @bar()
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define void @test1() personality ptr @__gxx_personality_v0 {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: invoke void @bar()
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; CHECK-NEXT: to label [[CONT:%.*]] unwind label [[LPAD:%.*]]
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; CHECK: cont:
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; CHECK-NEXT: ret void
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; CHECK: lpad:
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; CHECK-NEXT: [[EX:%.*]] = landingpad { ptr, i32 }
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; CHECK-NEXT: cleanup
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; CHECK-NEXT: resume { ptr, i32 } [[EX]]
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;
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entry:
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invoke void @bar() to label %cont unwind label %lpad
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cont:
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ret void
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lpad:
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%ex = landingpad { ptr, i32 } cleanup
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%exc_ptr = extractvalue { ptr, i32 } %ex, 0
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%filter = extractvalue { ptr, i32 } %ex, 1
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%exc_ptr2 = insertvalue { ptr, i32 } poison, ptr %exc_ptr, 0
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%filter2 = insertvalue { ptr, i32 } %exc_ptr2, i32 %filter, 1
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resume { ptr, i32 } %filter2
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}
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declare i32 @__gxx_personality_v0(i32, i64, ptr, ptr)
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define { i8, i32 } @test2({ ptr, i32 } %x) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[EX:%.*]] = extractvalue { ptr, i32 } [[X:%.*]], 1
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; CHECK-NEXT: [[INS:%.*]] = insertvalue { i8, i32 } undef, i32 [[EX]], 1
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; CHECK-NEXT: ret { i8, i32 } [[INS]]
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;
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%ex = extractvalue { ptr, i32 } %x, 1
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%ins = insertvalue { i8, i32 } undef, i32 %ex, 1
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ret { i8, i32 } %ins
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}
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define i32 @test3(i32 %a, float %b) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret i32 [[A:%.*]]
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;
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%agg1 = insertvalue {i32, float} undef, i32 %a, 0
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%agg2 = insertvalue {i32, float} %agg1, float %b, 1
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%ev = extractvalue {i32, float} %agg2, 0
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ret i32 %ev
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}
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define i8 @test4(<8 x i8> %V) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[ADD:%.*]] = add <8 x i8> [[V:%.*]], bitcast (<1 x double> <double 0x319BEB8FD172E36> to <8 x i8>)
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; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <8 x i8> [[ADD]], i32 6
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; CHECK-NEXT: ret i8 [[EXTRACT]]
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;
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%add = add <8 x i8> %V, bitcast (double 0x319BEB8FD172E36 to <8 x i8>)
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%extract = extractelement <8 x i8> %add, i32 6
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ret i8 %extract
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}
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define i32 @test5(<4 x i32> %V) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: ret i32 poison
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;
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%extract = extractelement <4 x i32> %V, i32 undef
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ret i32 %extract
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}
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