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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt < %s -passes=instcombine -S | FileCheck %s3 4define i32 @sub1(i32 %x) {5; CHECK-LABEL: @sub1(6; CHECK-NEXT: [[Y:%.*]] = sub i32 0, [[X:%.*]]7; CHECK-NEXT: [[Z:%.*]] = sdiv i32 [[Y]], 3378; CHECK-NEXT: ret i32 [[Z]]9;10 %y = sub i32 0, %x11 %z = sdiv i32 %y, 33712 ret i32 %z13}14 15define i32 @sub2(i32 %x) {16; CHECK-LABEL: @sub2(17; CHECK-NEXT: [[Z:%.*]] = sdiv i32 [[X:%.*]], -33718; CHECK-NEXT: ret i32 [[Z]]19;20 %y = sub nsw i32 0, %x21 %z = sdiv i32 %y, 33722 ret i32 %z23}24 25define i1 @shl_icmp(i64 %X) {26; CHECK-LABEL: @shl_icmp(27; CHECK-NEXT: [[B:%.*]] = icmp eq i64 [[X:%.*]], 028; CHECK-NEXT: ret i1 [[B]]29;30 %A = shl nuw i64 %X, 2 ; X/431 %B = icmp eq i64 %A, 032 ret i1 %B33}34 35define i64 @shl1(i64 %X, ptr %P) {36; CHECK-LABEL: @shl1(37; CHECK-NEXT: [[A:%.*]] = and i64 [[X:%.*]], 31238; CHECK-NEXT: store i64 [[A]], ptr [[P:%.*]], align 439; CHECK-NEXT: [[B:%.*]] = shl nuw nsw i64 [[A]], 840; CHECK-NEXT: ret i64 [[B]]41;42 %A = and i64 %X, 31243 store i64 %A, ptr %P ; multiple uses of A.44 %B = shl i64 %A, 845 ret i64 %B46}47 48define i32 @preserve1(i32 %x) {49; CHECK-LABEL: @preserve1(50; CHECK-NEXT: [[ADD3:%.*]] = add nsw i32 [[X:%.*]], 551; CHECK-NEXT: ret i32 [[ADD3]]52;53 %add = add nsw i32 %x, 254 %add3 = add nsw i32 %add, 355 ret i32 %add356}57 58define i8 @nopreserve1(i8 %x) {59; CHECK-LABEL: @nopreserve1(60; CHECK-NEXT: [[ADD3:%.*]] = add i8 [[X:%.*]], -12661; CHECK-NEXT: ret i8 [[ADD3]]62;63 %add = add nsw i8 %x, 12764 %add3 = add nsw i8 %add, 365 ret i8 %add366}67 68define i8 @nopreserve2(i8 %x) {69; CHECK-LABEL: @nopreserve2(70; CHECK-NEXT: [[ADD3:%.*]] = add i8 [[X:%.*]], 371; CHECK-NEXT: ret i8 [[ADD3]]72;73 %add = add i8 %x, 174 %add3 = add nsw i8 %add, 275 ret i8 %add376}77 78define i8 @nopreserve3(i8 %A, i8 %B) {79; CHECK-LABEL: @nopreserve3(80; CHECK-NEXT: [[Y:%.*]] = add i8 [[A:%.*]], [[B:%.*]]81; CHECK-NEXT: [[ADD:%.*]] = add i8 [[Y]], 2082; CHECK-NEXT: ret i8 [[ADD]]83;84 %x = add i8 %A, 1085 %y = add i8 %B, 1086 %add = add nsw i8 %x, %y87 ret i8 %add88}89 90define i8 @nopreserve4(i8 %A, i8 %B) {91; CHECK-LABEL: @nopreserve4(92; CHECK-NEXT: [[Y:%.*]] = add i8 [[A:%.*]], [[B:%.*]]93; CHECK-NEXT: [[ADD:%.*]] = add i8 [[Y]], 2094; CHECK-NEXT: ret i8 [[ADD]]95;96 %x = add nsw i8 %A, 1097 %y = add nsw i8 %B, 1098 %add = add nsw i8 %x, %y99 ret i8 %add100}101 102define <3 x i32> @shl_nuw_nsw_shuffle_splat_vec(<2 x i8> %x) {103; CHECK-LABEL: @shl_nuw_nsw_shuffle_splat_vec(104; CHECK-NEXT: [[T2:%.*]] = zext <2 x i8> [[X:%.*]] to <2 x i32>105; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x i32> [[T2]], <2 x i32> poison, <3 x i32> <i32 1, i32 0, i32 1>106; CHECK-NEXT: [[T3:%.*]] = shl nuw nsw <3 x i32> [[SHUF]], splat (i32 17)107; CHECK-NEXT: ret <3 x i32> [[T3]]108;109 %t2 = zext <2 x i8> %x to <2 x i32>110 %shuf = shufflevector <2 x i32> %t2, <2 x i32> poison, <3 x i32> <i32 1, i32 0, i32 1>111 %t3 = shl <3 x i32> %shuf, <i32 17, i32 17, i32 17>112 ret <3 x i32> %t3113}114 115; Negative test - if the shuffle mask contains an undef, we bail out to116; avoid propagating information that may not be used consistently by callers.117 118define <3 x i32> @shl_nuw_nsw_shuffle_undef_elt_splat_vec(<2 x i8> %x) {119; CHECK-LABEL: @shl_nuw_nsw_shuffle_undef_elt_splat_vec(120; CHECK-NEXT: [[T2:%.*]] = zext <2 x i8> [[X:%.*]] to <2 x i32>121; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x i32> [[T2]], <2 x i32> poison, <3 x i32> <i32 1, i32 poison, i32 0>122; CHECK-NEXT: [[T3:%.*]] = shl <3 x i32> [[SHUF]], splat (i32 17)123; CHECK-NEXT: ret <3 x i32> [[T3]]124;125 %t2 = zext <2 x i8> %x to <2 x i32>126 %shuf = shufflevector <2 x i32> %t2, <2 x i32> poison, <3 x i32> <i32 1, i32 undef, i32 0>127 %t3 = shl <3 x i32> %shuf, <i32 17, i32 17, i32 17>128 ret <3 x i32> %t3129}130 131; Make sure we don't crash on a ConstantExpr shufflevector132define <vscale x 2 x i64> @mul_nuw_nsw_shuffle_constant_expr(<vscale x 2 x i8> %z) {133; CHECK-LABEL: @mul_nuw_nsw_shuffle_constant_expr(134; CHECK-NEXT: [[XX:%.*]] = zext <vscale x 2 x i8> [[Z:%.*]] to <vscale x 2 x i64>135; CHECK-NEXT: [[T3:%.*]] = mul <vscale x 2 x i64> [[XX]], shufflevector (<vscale x 2 x i64> insertelement (<vscale x 2 x i64> undef, i64 3, i32 0), <vscale x 2 x i64> zeroinitializer, <vscale x 2 x i32> zeroinitializer)136; CHECK-NEXT: ret <vscale x 2 x i64> [[T3]]137;138 %xx = zext <vscale x 2 x i8> %z to <vscale x 2 x i64>139 %shuf = shufflevector <vscale x 2 x i64> insertelement (<vscale x 2 x i64> undef, i64 3, i32 0), <vscale x 2 x i64> zeroinitializer, <vscale x 2 x i32> zeroinitializer140 %t3 = mul <vscale x 2 x i64> %shuf, %xx141 ret <vscale x 2 x i64> %t3142}143