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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt < %s -passes=instcombine -S | FileCheck %s3 4; If we have some pattern that leaves only some low bits set, lshr then performs5; left-shift of those bits, we can combine those two shifts into a shift+mask.6 7; There are many variants to this pattern:8; e) (trunc (((x << maskNbits) l>> maskNbits))) << shiftNbits9; simplify to:10; ((trunc(x)) << shiftNbits) & (-1 >> ((-(maskNbits+shiftNbits))+32))11 12; Simple tests.13 14declare void @use32(i32)15declare void @use64(i64)16 17define i32 @t0_basic(i64 %x, i32 %nbits) {18; CHECK-LABEL: @t0_basic(19; CHECK-NEXT: [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i6420; CHECK-NEXT: [[T1:%.*]] = shl i64 [[X:%.*]], [[T0]]21; CHECK-NEXT: [[T2:%.*]] = add i32 [[NBITS]], -3222; CHECK-NEXT: [[T3:%.*]] = lshr exact i64 [[T1]], [[T0]]23; CHECK-NEXT: call void @use64(i64 [[T0]])24; CHECK-NEXT: call void @use64(i64 [[T1]])25; CHECK-NEXT: call void @use32(i32 [[T2]])26; CHECK-NEXT: call void @use64(i64 [[T3]])27; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[X]] to i3228; CHECK-NEXT: [[T5:%.*]] = shl i32 [[TMP1]], [[T2]]29; CHECK-NEXT: ret i32 [[T5]]30;31 %t0 = zext i32 %nbits to i6432 %t1 = shl i64 %x, %t033 %t2 = add i32 %nbits, -3234 %t3 = lshr i64 %t1, %t035 36 call void @use64(i64 %t0)37 call void @use64(i64 %t1)38 call void @use32(i32 %t2)39 call void @use64(i64 %t3)40 41 %t4 = trunc i64 %t3 to i3242 %t5 = shl i32 %t4, %t243 ret i32 %t544}45 46; Vectors47 48declare void @use8xi32(<8 x i32>)49declare void @use8xi64(<8 x i64>)50 51define <8 x i32> @t1_vec_splat(<8 x i64> %x, <8 x i32> %nbits) {52; CHECK-LABEL: @t1_vec_splat(53; CHECK-NEXT: [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>54; CHECK-NEXT: [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]55; CHECK-NEXT: [[T2:%.*]] = add <8 x i32> [[NBITS]], splat (i32 -32)56; CHECK-NEXT: [[T3:%.*]] = lshr exact <8 x i64> [[T1]], [[T0]]57; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T0]])58; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T1]])59; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T2]])60; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T3]])61; CHECK-NEXT: [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>62; CHECK-NEXT: [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]63; CHECK-NEXT: ret <8 x i32> [[T5]]64;65 %t0 = zext <8 x i32> %nbits to <8 x i64>66 %t1 = shl <8 x i64> %x, %t067 %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>68 %t3 = lshr <8 x i64> %t1, %t069 70 call void @use8xi64(<8 x i64> %t0)71 call void @use8xi64(<8 x i64> %t1)72 call void @use8xi32(<8 x i32> %t2)73 call void @use8xi64(<8 x i64> %t3)74 75 %t4 = trunc <8 x i64> %t3 to <8 x i32>76 %t5 = shl <8 x i32> %t4, %t277 ret <8 x i32> %t578}79 80define <8 x i32> @t2_vec_splat_undef(<8 x i64> %x, <8 x i32> %nbits) {81; CHECK-LABEL: @t2_vec_splat_undef(82; CHECK-NEXT: [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>83; CHECK-NEXT: [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]84; CHECK-NEXT: [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>85; CHECK-NEXT: [[T3:%.*]] = lshr exact <8 x i64> [[T1]], [[T0]]86; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T0]])87; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T1]])88; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T2]])89; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T3]])90; CHECK-NEXT: [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>91; CHECK-NEXT: [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]92; CHECK-NEXT: ret <8 x i32> [[T5]]93;94 %t0 = zext <8 x i32> %nbits to <8 x i64>95 %t1 = shl <8 x i64> %x, %t096 %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>97 %t3 = lshr <8 x i64> %t1, %t098 99 call void @use8xi64(<8 x i64> %t0)100 call void @use8xi64(<8 x i64> %t1)101 call void @use8xi32(<8 x i32> %t2)102 call void @use8xi64(<8 x i64> %t3)103 104 %t4 = trunc <8 x i64> %t3 to <8 x i32>105 %t5 = shl <8 x i32> %t4, %t2106 ret <8 x i32> %t5107}108 109define <8 x i32> @t3_vec_nonsplat(<8 x i64> %x, <8 x i32> %nbits) {110; CHECK-LABEL: @t3_vec_nonsplat(111; CHECK-NEXT: [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>112; CHECK-NEXT: [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]113; CHECK-NEXT: [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>114; CHECK-NEXT: [[T3:%.*]] = lshr exact <8 x i64> [[T1]], [[T0]]115; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T0]])116; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T1]])117; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T2]])118; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T3]])119; CHECK-NEXT: [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>120; CHECK-NEXT: [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]121; CHECK-NEXT: ret <8 x i32> [[T5]]122;123 %t0 = zext <8 x i32> %nbits to <8 x i64>124 %t1 = shl <8 x i64> %x, %t0125 %t2 = add <8 x i32> %nbits, <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>126 %t3 = lshr <8 x i64> %t1, %t0127 128 call void @use8xi64(<8 x i64> %t0)129 call void @use8xi64(<8 x i64> %t1)130 call void @use8xi32(<8 x i32> %t2)131 call void @use8xi64(<8 x i64> %t3)132 133 %t4 = trunc <8 x i64> %t3 to <8 x i32>134 %t5 = shl <8 x i32> %t4, %t2135 ret <8 x i32> %t5136}137 138; Extra uses.139 140define i32 @n4_extrause(i64 %x, i32 %nbits) {141; CHECK-LABEL: @n4_extrause(142; CHECK-NEXT: [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64143; CHECK-NEXT: [[T1:%.*]] = shl i64 [[X:%.*]], [[T0]]144; CHECK-NEXT: [[T2:%.*]] = add i32 [[NBITS]], -32145; CHECK-NEXT: [[T3:%.*]] = lshr exact i64 [[T1]], [[T0]]146; CHECK-NEXT: call void @use64(i64 [[T0]])147; CHECK-NEXT: call void @use64(i64 [[T1]])148; CHECK-NEXT: call void @use32(i32 [[T2]])149; CHECK-NEXT: call void @use64(i64 [[T3]])150; CHECK-NEXT: [[T4:%.*]] = trunc i64 [[T3]] to i32151; CHECK-NEXT: call void @use32(i32 [[T4]])152; CHECK-NEXT: [[T5:%.*]] = shl i32 [[T4]], [[T2]]153; CHECK-NEXT: ret i32 [[T5]]154;155 %t0 = zext i32 %nbits to i64156 %t1 = shl i64 %x, %t0157 %t2 = add i32 %nbits, -32158 %t3 = lshr i64 %t1, %t0159 160 call void @use64(i64 %t0)161 call void @use64(i64 %t1)162 call void @use32(i32 %t2)163 call void @use64(i64 %t3)164 165 %t4 = trunc i64 %t3 to i32166 call void @use32(i32 %t4)167 %t5 = shl i32 %t4, %t2168 ret i32 %t5169}170