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