128 lines
4.7 KiB
LLVM
128 lines
4.7 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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; Tests to verify proper functioning of the icmp folding implemented in
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; InstCombiner::foldICmpBitCastConstant
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; Specifically, folding:
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; icmp <pred> iN X, C
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; where X = bitcast <M x iK> (shufflevector <M x iK> %vec, undef, SC)) to iN
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; and C is a splat of a K-bit pattern
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; and SC is a constant vector = <C', C', C', ..., C'>
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; Into:
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; %E = extractelement <M x iK> %vec, i32 C'
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; icmp <pred> iK %E, trunc(C)
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define i1 @test_i1_0(i1 %val) {
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; CHECK-LABEL: @test_i1_0(
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; CHECK-NEXT: [[COND:%.*]] = xor i1 [[VAL:%.*]], true
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%insvec = insertelement <4 x i1> undef, i1 %val, i32 0
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%vec = shufflevector <4 x i1> %insvec, <4 x i1> undef, <4 x i32> zeroinitializer
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%cast = bitcast <4 x i1> %vec to i4
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%cond = icmp eq i4 %cast, 0
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ret i1 %cond
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}
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define i1 @test_i1_0_2(i1 %val) {
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; CHECK-LABEL: @test_i1_0_2(
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; CHECK-NEXT: [[COND:%.*]] = xor i1 [[VAL:%.*]], true
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%insvec = insertelement <4 x i1> undef, i1 %val, i32 2
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%vec = shufflevector <4 x i1> %insvec, <4 x i1> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
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%cast = bitcast <4 x i1> %vec to i4
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%cond = icmp eq i4 %cast, 0
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ret i1 %cond
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}
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define i1 @test_i1_m1(i1 %val) {
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; CHECK-LABEL: @test_i1_m1(
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; CHECK-NEXT: ret i1 [[VAL:%.*]]
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;
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%insvec = insertelement <4 x i1> undef, i1 %val, i32 0
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%vec = shufflevector <4 x i1> %insvec, <4 x i1> undef, <4 x i32> zeroinitializer
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%cast = bitcast <4 x i1> %vec to i4
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%cond = icmp eq i4 %cast, -1
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ret i1 %cond
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}
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define i1 @test_i8_pattern(i8 %val) {
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; CHECK-LABEL: @test_i8_pattern(
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i8 [[VAL:%.*]], 72
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%insvec = insertelement <4 x i8> undef, i8 %val, i32 0
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%vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer
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%cast = bitcast <4 x i8> %vec to i32
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%cond = icmp eq i32 %cast, 1212696648
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ret i1 %cond
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}
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define i1 @test_i8_pattern_2(i8 %val) {
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; CHECK-LABEL: @test_i8_pattern_2(
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i8 [[VAL:%.*]], 72
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%insvec = insertelement <4 x i8> undef, i8 %val, i32 2
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%vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
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%cast = bitcast <4 x i8> %vec to i32
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%cond = icmp eq i32 %cast, 1212696648
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ret i1 %cond
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}
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; Make sure we don't try to fold if the shufflemask has differing element values
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define i1 @test_i8_pattern_3(<4 x i8> %invec) {
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; CHECK-LABEL: @test_i8_pattern_3(
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; CHECK-NEXT: [[VEC:%.*]] = shufflevector <4 x i8> [[INVEC:%.*]], <4 x i8> undef, <4 x i32> <i32 1, i32 0, i32 3, i32 2>
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; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[VEC]] to i32
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[CAST]], 1212696648
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%vec = shufflevector <4 x i8> %invec, <4 x i8> undef, <4 x i32> <i32 1, i32 0, i32 3, i32 2>
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%cast = bitcast <4 x i8> %vec to i32
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%cond = icmp eq i32 %cast, 1212696648
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ret i1 %cond
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}
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; Make sure we don't try to fold if the compared-to constant isn't a splatted value
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define i1 @test_i8_nopattern(i8 %val) {
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; CHECK-LABEL: @test_i8_nopattern(
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; CHECK-NEXT: [[INSVEC:%.*]] = insertelement <4 x i8> undef, i8 [[VAL:%.*]], i64 0
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; CHECK-NEXT: [[VEC:%.*]] = shufflevector <4 x i8> [[INSVEC]], <4 x i8> undef, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[VEC]] to i32
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[CAST]], 1212696647
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%insvec = insertelement <4 x i8> undef, i8 %val, i32 0
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%vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer
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%cast = bitcast <4 x i8> %vec to i32
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%cond = icmp eq i32 %cast, 1212696647
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ret i1 %cond
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}
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; Verify that we fold more than just the eq predicate
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define i1 @test_i8_ult_pattern(i8 %val) {
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; CHECK-LABEL: @test_i8_ult_pattern(
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; CHECK-NEXT: [[COND:%.*]] = icmp ult i8 [[VAL:%.*]], 72
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%insvec = insertelement <4 x i8> undef, i8 %val, i32 0
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%vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer
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%cast = bitcast <4 x i8> %vec to i32
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%cond = icmp ult i32 %cast, 1212696648
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ret i1 %cond
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}
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define i1 @extending_shuffle_with_weird_types(<2 x i9> %v) {
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; CHECK-LABEL: @extending_shuffle_with_weird_types(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x i9> [[V:%.*]], i64 0
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i9 [[TMP1]], 1
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; CHECK-NEXT: ret i1 [[CMP]]
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;
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%splat = shufflevector <2 x i9> %v, <2 x i9> undef, <3 x i32> zeroinitializer
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%cast = bitcast <3 x i9> %splat to i27
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%cmp = icmp slt i27 %cast, 262657 ; 0x040201
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ret i1 %cmp
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}
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