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61a834b1e0
This includes a fix for cases where things get marked as overdefined in ResolvedUndefsIn, but we later discover a constant. To avoid crashing, we consistently bail out on overdefined values in the visitors. This is similar to the previous behavior with forcedconstant. This reverts the revert commit 02b72f564c8be0b4f4337d5c4a3fcf7e8018a818.
48 lines
959 B
LLVM
48 lines
959 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -sccp -S | FileCheck %s
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; Test that SCCP has basic knowledge of when and/or/mul nuke overdefined values.
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define i32 @test(i32 %X) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: ret i32 0
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;
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%Y = and i32 %X, 0
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ret i32 %Y
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}
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define i32 @test2(i32 %X) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: ret i32 -1
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;
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%Y = or i32 -1, %X
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ret i32 %Y
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}
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define i32 @test3(i32 %X) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[Y:%.*]] = and i32 undef, [[X:%.*]]
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; CHECK-NEXT: ret i32 [[Y]]
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;
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%Y = and i32 undef, %X
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ret i32 %Y
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}
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define i32 @test4(i32 %X) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[Y:%.*]] = or i32 [[X:%.*]], undef
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; CHECK-NEXT: ret i32 [[Y]]
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;
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%Y = or i32 %X, undef
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ret i32 %Y
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}
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; X * 0 = 0 even if X is overdefined.
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define i32 @test5(i32 %foo) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: ret i32 0
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;
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%patatino = mul i32 %foo, 0
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ret i32 %patatino
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}
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