95 lines
2.9 KiB
LLVM
95 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instcombine %s -S -o - | FileCheck %s
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; Scalar Types
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define i32 @neg_or_lshr_i32(i32 %x) {
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; CHECK-LABEL: @neg_or_lshr_i32(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[X:%.*]], 0
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; CHECK-NEXT: [[SHR:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[SHR]]
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;
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%neg = sub i32 0, %x
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%or = or i32 %neg, %x
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%shr = lshr i32 %or, 31
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ret i32 %shr
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}
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; Commute
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define i32 @neg_or_lshr_i32_commute(i32 %x0) {
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; CHECK-LABEL: @neg_or_lshr_i32_commute(
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; CHECK-NEXT: [[X:%.*]] = sdiv i32 42, [[X0:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[X]], 0
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; CHECK-NEXT: [[SHR:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[SHR]]
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;
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%x = sdiv i32 42, %x0 ; thwart complexity-based canonicalization
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%neg = sub i32 0, %x
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%or = or i32 %x, %neg
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%shr = lshr i32 %or, 31
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ret i32 %shr
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}
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; Vector Types
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define <4 x i32> @neg_or_lshr_i32_vec(<4 x i32> %x) {
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; CHECK-LABEL: @neg_or_lshr_i32_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne <4 x i32> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[SHR:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i32>
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; CHECK-NEXT: ret <4 x i32> [[SHR]]
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;
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%neg = sub <4 x i32> zeroinitializer, %x
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%or = or <4 x i32> %neg, %x
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%shr = lshr <4 x i32> %or, <i32 31, i32 31, i32 31, i32 31>
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ret <4 x i32> %shr
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}
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define <4 x i32> @neg_or_lshr_i32_vec_commute(<4 x i32> %x0) {
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; CHECK-LABEL: @neg_or_lshr_i32_vec_commute(
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; CHECK-NEXT: [[X:%.*]] = sdiv <4 x i32> <i32 42, i32 42, i32 42, i32 42>, [[X0:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne <4 x i32> [[X]], zeroinitializer
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; CHECK-NEXT: [[SHR:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i32>
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; CHECK-NEXT: ret <4 x i32> [[SHR]]
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;
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%x = sdiv <4 x i32> <i32 42, i32 42, i32 42, i32 42>, %x0 ; thwart complexity-based canonicalization
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%neg = sub <4 x i32> zeroinitializer, %x
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%or = or <4 x i32> %x, %neg
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%shr = lshr <4 x i32> %or, <i32 31, i32 31, i32 31, i32 31>
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ret <4 x i32> %shr
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}
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; Extra uses
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define i32 @neg_extra_use_or_lshr_i32(i32 %x, ptr %p) {
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; CHECK-LABEL: @neg_extra_use_or_lshr_i32(
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; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[X]], 0
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; CHECK-NEXT: [[SHR:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: store i32 [[NEG]], ptr [[P:%.*]], align 4
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; CHECK-NEXT: ret i32 [[SHR]]
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;
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%neg = sub i32 0, %x
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%or = or i32 %neg, %x
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%shr = lshr i32 %or, 31
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store i32 %neg, ptr %p
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ret i32 %shr
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}
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; Negative Tests
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define i32 @neg_or_extra_use_lshr_i32(i32 %x, ptr %p) {
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; CHECK-LABEL: @neg_or_extra_use_lshr_i32(
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; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[NEG]], [[X]]
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; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[OR]], 31
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; CHECK-NEXT: store i32 [[OR]], ptr [[P:%.*]], align 4
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; CHECK-NEXT: ret i32 [[SHR]]
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;
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%neg = sub i32 0, %x
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%or = or i32 %neg, %x
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%shr = lshr i32 %or, 31
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store i32 %or, ptr %p
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ret i32 %shr
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}
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