1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -instcombine -S | FileCheck %s 3 4declare void @use(i32) 5declare i32 @llvm.abs.i32(i32, i1) 6declare <4 x i32> @llvm.abs.v4i32(<4 x i32>, i1) 7 8define i32 @test_sdiv_canonicalize_op0(i32 %x, i32 %y) { 9; CHECK-LABEL: @test_sdiv_canonicalize_op0( 10; CHECK-NEXT: [[SDIV1:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]] 11; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]] 12; CHECK-NEXT: ret i32 [[SDIV]] 13; 14 %neg = sub nsw i32 0, %x 15 %sdiv = sdiv i32 %neg, %y 16 ret i32 %sdiv 17} 18 19define i32 @test_sdiv_canonicalize_op0_exact(i32 %x, i32 %y) { 20; CHECK-LABEL: @test_sdiv_canonicalize_op0_exact( 21; CHECK-NEXT: [[SDIV1:%.*]] = sdiv exact i32 [[X:%.*]], [[Y:%.*]] 22; CHECK-NEXT: [[SDIV:%.*]] = sub nsw i32 0, [[SDIV1]] 23; CHECK-NEXT: ret i32 [[SDIV]] 24; 25 %neg = sub nsw i32 0, %x 26 %sdiv = sdiv exact i32 %neg, %y 27 ret i32 %sdiv 28} 29 30; (X/-Y) is not equal to -(X/Y), don't canonicalize. 31define i32 @test_sdiv_canonicalize_op1(i32 %x, i32 %z) { 32; CHECK-LABEL: @test_sdiv_canonicalize_op1( 33; CHECK-NEXT: [[Y:%.*]] = mul i32 [[Z:%.*]], 3 34; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]] 35; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[Y]], [[NEG]] 36; CHECK-NEXT: ret i32 [[SDIV]] 37; 38 %y = mul i32 %z, 3 39 %neg = sub nsw i32 0, %x 40 %sdiv = sdiv i32 %y, %neg 41 ret i32 %sdiv 42} 43 44define i32 @test_sdiv_canonicalize_nonsw(i32 %x, i32 %y) { 45; CHECK-LABEL: @test_sdiv_canonicalize_nonsw( 46; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]] 47; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]] 48; CHECK-NEXT: ret i32 [[SDIV]] 49; 50 %neg = sub i32 0, %x 51 %sdiv = sdiv i32 %neg, %y 52 ret i32 %sdiv 53} 54 55define <2 x i32> @test_sdiv_canonicalize_vec(<2 x i32> %x, <2 x i32> %y) { 56; CHECK-LABEL: @test_sdiv_canonicalize_vec( 57; CHECK-NEXT: [[SDIV1:%.*]] = sdiv <2 x i32> [[X:%.*]], [[Y:%.*]] 58; CHECK-NEXT: [[SDIV:%.*]] = sub nsw <2 x i32> zeroinitializer, [[SDIV1]] 59; CHECK-NEXT: ret <2 x i32> [[SDIV]] 60; 61 %neg = sub nsw <2 x i32> <i32 0, i32 0>, %x 62 %sdiv = sdiv <2 x i32> %neg, %y 63 ret <2 x i32> %sdiv 64} 65 66define i32 @test_sdiv_canonicalize_multiple_uses(i32 %x, i32 %y) { 67; CHECK-LABEL: @test_sdiv_canonicalize_multiple_uses( 68; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]] 69; CHECK-NEXT: [[SDIV:%.*]] = sdiv i32 [[NEG]], [[Y:%.*]] 70; CHECK-NEXT: [[SDIV2:%.*]] = sdiv i32 [[SDIV]], [[NEG]] 71; CHECK-NEXT: ret i32 [[SDIV2]] 72; 73 %neg = sub nsw i32 0, %x 74 %sdiv = sdiv i32 %neg, %y 75 %sdiv2 = sdiv i32 %sdiv, %neg 76 ret i32 %sdiv2 77} 78 79; There is combination: -(X/CE) -> (X/-CE). 80; If combines (X/-CE) to -(X/CE), make sure don't combine them endless. 81 82@X = global i32 5 83 84define i64 @test_sdiv_canonicalize_constexpr(i64 %L1) { 85; currently opt folds (sub nsw i64 0, constexpr) -> (sub i64, 0, constexpr). 86; sdiv canonicalize requires a nsw sub. 87; CHECK-LABEL: @test_sdiv_canonicalize_constexpr( 88; CHECK-NEXT: [[B4:%.*]] = sdiv i64 [[L1:%.*]], sub (i64 0, i64 ptrtoint (i32* @X to i64)) 89; CHECK-NEXT: ret i64 [[B4]] 90; 91 %v1 = ptrtoint i32* @X to i64 92 %B8 = sub nsw i64 0, %v1 93 %B4 = sdiv i64 %L1, %B8 94 ret i64 %B4 95} 96 97define i32 @sdiv_abs_nsw(i32 %x) { 98; CHECK-LABEL: @sdiv_abs_nsw( 99; CHECK-NEXT: [[DOTINV:%.*]] = icmp sgt i32 [[X:%.*]], -1 100; CHECK-NEXT: [[R:%.*]] = select i1 [[DOTINV]], i32 1, i32 -1 101; CHECK-NEXT: ret i32 [[R]] 102; 103 %a = call i32 @llvm.abs.i32(i32 %x, i1 true) 104 %r = sdiv i32 %a, %x 105 ret i32 %r 106} 107 108define <4 x i32> @sdiv_abs_nsw_vec(<4 x i32> %x) { 109; CHECK-LABEL: @sdiv_abs_nsw_vec( 110; CHECK-NEXT: [[DOTINV:%.*]] = icmp sgt <4 x i32> [[X:%.*]], <i32 -1, i32 -1, i32 -1, i32 -1> 111; CHECK-NEXT: [[R:%.*]] = select <4 x i1> [[DOTINV]], <4 x i32> <i32 1, i32 1, i32 1, i32 1>, <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1> 112; CHECK-NEXT: ret <4 x i32> [[R]] 113; 114 %a = call <4 x i32> @llvm.abs.v4i32(<4 x i32> %x, i1 true) 115 %r = sdiv <4 x i32> %x, %a 116 ret <4 x i32> %r 117} 118 119; Negative test - requires poison int min (nsw) 120 121define i32 @sdiv_abs(i32 %x) { 122; CHECK-LABEL: @sdiv_abs( 123; CHECK-NEXT: [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 false) 124; CHECK-NEXT: [[R:%.*]] = sdiv i32 [[A]], [[X]] 125; CHECK-NEXT: ret i32 [[R]] 126; 127 %a = call i32 @llvm.abs.i32(i32 %x, i1 false) 128 %r = sdiv i32 %a, %x 129 ret i32 %r 130} 131 132; Negative test 133 134define i32 @sdiv_abs_extra_use(i32 %x) { 135; CHECK-LABEL: @sdiv_abs_extra_use( 136; CHECK-NEXT: [[A:%.*]] = call i32 @llvm.abs.i32(i32 [[X:%.*]], i1 true) 137; CHECK-NEXT: call void @use(i32 [[A]]) 138; CHECK-NEXT: [[R:%.*]] = sdiv i32 [[A]], [[X]] 139; CHECK-NEXT: ret i32 [[R]] 140; 141 %a = call i32 @llvm.abs.i32(i32 %x, i1 true) 142 call void @use(i32 %a) 143 %r = sdiv i32 %a, %x 144 ret i32 %r 145} 146