ce4fa93db8
Extended value is known to be inside range smaller than full one. Prevent SCCP to mark such value as overdefined. Fixes PR52253 Differential Revision: https://reviews.llvm.org/D112721
102 lines
2.9 KiB
LLVM
102 lines
2.9 KiB
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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define i32 @zext_lshr(i1 %t0) {
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; CHECK-LABEL: @zext_lshr(
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; CHECK-NEXT: [[T1:%.*]] = zext i1 [[T0:%.*]] to i32
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; CHECK-NEXT: ret i32 0
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;
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%t1 = zext i1 %t0 to i32
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%t2 = lshr i32 %t1, 1
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ret i32 %t2
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}
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define i1 @zext_icmp(i1 %t0) {
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; CHECK-LABEL: @zext_icmp(
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; CHECK-NEXT: [[T1:%.*]] = zext i1 [[T0:%.*]] to i32
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; CHECK-NEXT: ret i1 false
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;
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%t1 = zext i1 %t0 to i32
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%t2 = icmp eq i32 %t1, 2
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ret i1 %t2
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}
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; negative test. SCCP operates poorly with vector ranges
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define <2 x i1> @zext_vector(<2 x i1> %t0) {
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; CHECK-LABEL: @zext_vector(
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; CHECK-NEXT: [[T1:%.*]] = zext <2 x i1> [[T0:%.*]] to <2 x i32>
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; CHECK-NEXT: [[T2:%.*]] = icmp eq <2 x i32> [[T1]], <i32 2, i32 2>
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; CHECK-NEXT: ret <2 x i1> [[T2]]
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;
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%t1 = zext <2 x i1> %t0 to <2 x i32>
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%t2 = icmp eq <2 x i32> %t1, <i32 2, i32 2>
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ret <2 x i1> %t2
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}
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; negative test. SCCP operates poorly with vector ranges
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define <2 x i1> @zext_vector2(<2 x i1> %t0) {
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; CHECK-LABEL: @zext_vector2(
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; CHECK-NEXT: [[T1:%.*]] = zext <2 x i1> [[T0:%.*]] to <2 x i32>
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; CHECK-NEXT: [[T2:%.*]] = add <2 x i32> [[T1]], <i32 2, i32 2>
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; CHECK-NEXT: [[T3:%.*]] = icmp eq <2 x i32> [[T1]], [[T2]]
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; CHECK-NEXT: ret <2 x i1> [[T3]]
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;
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%t1 = zext <2 x i1> %t0 to <2 x i32>
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%t2 = add <2 x i32> %t1, <i32 2, i32 2>
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%t3 = icmp eq <2 x i32> %t1, %t2
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ret <2 x i1> %t3
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}
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; negative test: %t2 can be replaced by %t1, but SCCP operates by ranges only
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define i32 @sext_ashr(i1 %t0) {
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; CHECK-LABEL: @sext_ashr(
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; CHECK-NEXT: [[T1:%.*]] = sext i1 [[T0:%.*]] to i32
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; CHECK-NEXT: [[T2:%.*]] = ashr i32 [[T1]], 1
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; CHECK-NEXT: ret i32 [[T2]]
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;
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%t1 = sext i1 %t0 to i32
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%t2 = ashr i32 %t1, 1
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ret i32 %t2
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}
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define i1 @sext_icmp(i1 %t0) {
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; CHECK-LABEL: @sext_icmp(
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; CHECK-NEXT: [[T1:%.*]] = sext i1 [[T0:%.*]] to i32
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; CHECK-NEXT: ret i1 false
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;
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%t1 = sext i1 %t0 to i32
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%t2 = icmp eq i32 %t1, 2
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ret i1 %t2
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}
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; negative test. SCCP operates poorly with vector ranges
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define <2 x i1> @sext_vector(<2 x i1> %t0) {
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; CHECK-LABEL: @sext_vector(
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; CHECK-NEXT: [[T1:%.*]] = sext <2 x i1> [[T0:%.*]] to <2 x i32>
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; CHECK-NEXT: [[T2:%.*]] = icmp eq <2 x i32> [[T1]], <i32 2, i32 2>
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; CHECK-NEXT: ret <2 x i1> [[T2]]
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;
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%t1 = sext <2 x i1> %t0 to <2 x i32>
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%t2 = icmp eq <2 x i32> %t1, <i32 2, i32 2>
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ret <2 x i1> %t2
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}
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; negative test. SCCP operates poorly with vector ranges
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define <2 x i1> @sext_vector2(<2 x i1> %t0) {
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; CHECK-LABEL: @sext_vector2(
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; CHECK-NEXT: [[T1:%.*]] = sext <2 x i1> [[T0:%.*]] to <2 x i32>
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; CHECK-NEXT: [[T2:%.*]] = add <2 x i32> [[T1]], <i32 2, i32 2>
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; CHECK-NEXT: [[T3:%.*]] = icmp eq <2 x i32> [[T1]], [[T2]]
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; CHECK-NEXT: ret <2 x i1> [[T3]]
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;
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%t1 = sext <2 x i1> %t0 to <2 x i32>
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%t2 = add <2 x i32> %t1, <i32 2, i32 2>
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%t3 = icmp eq <2 x i32> %t1, %t2
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ret <2 x i1> %t3
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}
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