766cf7f32e
Div/rem by zero is immediate undefined behavior and anything goes. Currently we fold it to undef, this patch changes it to fold to poison instead, which is slightly stronger. Differential Revision: https://reviews.llvm.org/D93995
100 lines
3.8 KiB
LLVM
100 lines
3.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define <4 x i32> @test_v4i32_splatconst_pow2(<4 x i32> %a0) {
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; CHECK-LABEL: @test_v4i32_splatconst_pow2(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <4 x i32> [[A0:%.*]], <i32 1, i32 1, i32 1, i32 1>
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; CHECK-NEXT: ret <4 x i32> [[TMP1]]
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;
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%1 = udiv <4 x i32> %a0, <i32 2, i32 2, i32 2, i32 2>
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ret <4 x i32> %1
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}
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define <4 x i32> @test_v4i32_const_pow2(<4 x i32> %a0) {
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; CHECK-LABEL: @test_v4i32_const_pow2(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <4 x i32> [[A0:%.*]], <i32 0, i32 1, i32 2, i32 3>
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; CHECK-NEXT: ret <4 x i32> [[TMP1]]
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;
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%1 = udiv <4 x i32> %a0, <i32 1, i32 2, i32 4, i32 8>
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ret <4 x i32> %1
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}
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; X udiv C, where C >= signbit
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define <4 x i32> @test_v4i32_negconstsplat(<4 x i32> %a0) {
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; CHECK-LABEL: @test_v4i32_negconstsplat(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <4 x i32> [[A0:%.*]], <i32 -4, i32 -4, i32 -4, i32 -4>
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; CHECK-NEXT: [[TMP2:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i32>
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; CHECK-NEXT: ret <4 x i32> [[TMP2]]
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;
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%1 = udiv <4 x i32> %a0, <i32 -3, i32 -3, i32 -3, i32 -3>
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ret <4 x i32> %1
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}
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define <4 x i32> @test_v4i32_negconst(<4 x i32> %a0) {
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; CHECK-LABEL: @test_v4i32_negconst(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <4 x i32> [[A0:%.*]], <i32 -4, i32 -6, i32 -8, i32 -10>
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; CHECK-NEXT: [[TMP2:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i32>
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; CHECK-NEXT: ret <4 x i32> [[TMP2]]
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;
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%1 = udiv <4 x i32> %a0, <i32 -3, i32 -5, i32 -7, i32 -9>
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ret <4 x i32> %1
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}
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define <4 x i32> @test_v4i32_negconst_undef(<4 x i32> %a0) {
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; CHECK-LABEL: @test_v4i32_negconst_undef(
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; CHECK-NEXT: ret <4 x i32> poison
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;
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%1 = udiv <4 x i32> %a0, <i32 -3, i32 -5, i32 -7, i32 undef>
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ret <4 x i32> %1
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}
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; X udiv (C1 << N), where C1 is "1<<C2" --> X >> (N+C2)
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define <4 x i32> @test_v4i32_shl_splatconst_pow2(<4 x i32> %a0, <4 x i32> %a1) {
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; CHECK-LABEL: @test_v4i32_shl_splatconst_pow2(
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; CHECK-NEXT: [[TMP1:%.*]] = add <4 x i32> [[A1:%.*]], <i32 2, i32 2, i32 2, i32 2>
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; CHECK-NEXT: [[TMP2:%.*]] = lshr <4 x i32> [[A0:%.*]], [[TMP1]]
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; CHECK-NEXT: ret <4 x i32> [[TMP2]]
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;
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%1 = shl <4 x i32> <i32 4, i32 4, i32 4, i32 4>, %a1
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%2 = udiv <4 x i32> %a0, %1
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ret <4 x i32> %2
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}
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define <4 x i32> @test_v4i32_shl_const_pow2(<4 x i32> %a0, <4 x i32> %a1) {
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; CHECK-LABEL: @test_v4i32_shl_const_pow2(
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; CHECK-NEXT: [[TMP1:%.*]] = add <4 x i32> [[A1:%.*]], <i32 2, i32 3, i32 4, i32 5>
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; CHECK-NEXT: [[TMP2:%.*]] = lshr <4 x i32> [[A0:%.*]], [[TMP1]]
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; CHECK-NEXT: ret <4 x i32> [[TMP2]]
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;
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%1 = shl <4 x i32> <i32 4, i32 8, i32 16, i32 32>, %a1
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%2 = udiv <4 x i32> %a0, %1
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ret <4 x i32> %2
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}
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; X udiv (zext (C1 << N)), where C1 is "1<<C2" --> X >> (N+C2)
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define <4 x i32> @test_v4i32_zext_shl_splatconst_pow2(<4 x i32> %a0, <4 x i16> %a1) {
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; CHECK-LABEL: @test_v4i32_zext_shl_splatconst_pow2(
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; CHECK-NEXT: [[TMP1:%.*]] = add <4 x i16> [[A1:%.*]], <i16 2, i16 2, i16 2, i16 2>
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; CHECK-NEXT: [[TMP2:%.*]] = zext <4 x i16> [[TMP1]] to <4 x i32>
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; CHECK-NEXT: [[TMP3:%.*]] = lshr <4 x i32> [[A0:%.*]], [[TMP2]]
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; CHECK-NEXT: ret <4 x i32> [[TMP3]]
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;
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%1 = shl <4 x i16> <i16 4, i16 4, i16 4, i16 4>, %a1
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%2 = zext <4 x i16> %1 to <4 x i32>
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%3 = udiv <4 x i32> %a0, %2
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ret <4 x i32> %3
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}
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define <4 x i32> @test_v4i32_zext_shl_const_pow2(<4 x i32> %a0, <4 x i16> %a1) {
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; CHECK-LABEL: @test_v4i32_zext_shl_const_pow2(
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; CHECK-NEXT: [[TMP1:%.*]] = add <4 x i16> [[A1:%.*]], <i16 2, i16 3, i16 4, i16 5>
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; CHECK-NEXT: [[TMP2:%.*]] = zext <4 x i16> [[TMP1]] to <4 x i32>
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; CHECK-NEXT: [[TMP3:%.*]] = lshr <4 x i32> [[A0:%.*]], [[TMP2]]
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; CHECK-NEXT: ret <4 x i32> [[TMP3]]
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;
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%1 = shl <4 x i16> <i16 4, i16 8, i16 16, i16 32>, %a1
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%2 = zext <4 x i16> %1 to <4 x i32>
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%3 = udiv <4 x i32> %a0, %2
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ret <4 x i32> %3
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}
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