158 lines
7.4 KiB
LLVM
158 lines
7.4 KiB
LLVM
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; 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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; If we have some pattern that leaves only some low bits set, and then performs
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; left-shift of those bits, we can combine those two shifts into a shift+mask.
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; There are many variants to this pattern:
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; b) (x & (~(-1 << maskNbits))) << shiftNbits
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; simplify to:
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; (x << shiftNbits) & (~(-1 << (maskNbits+shiftNbits)))
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; Simple tests.
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declare void @use32(i32)
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define i32 @t0_basic(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @t0_basic(
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; CHECK-NEXT: [[T0:%.*]] = add i32 [[NBITS:%.*]], -1
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; CHECK-NEXT: [[T1:%.*]] = shl i32 -1, [[T0]]
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; CHECK-NEXT: [[T2:%.*]] = xor i32 [[T1]], -1
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; CHECK-NEXT: [[T4:%.*]] = sub i32 32, [[NBITS]]
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; CHECK-NEXT: call void @use32(i32 [[T0]])
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; CHECK-NEXT: call void @use32(i32 [[T1]])
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; CHECK-NEXT: call void @use32(i32 [[T2]])
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; CHECK-NEXT: call void @use32(i32 [[T4]])
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; CHECK-NEXT: [[TMP1:%.*]] = shl i32 [[X:%.*]], [[T4]]
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; CHECK-NEXT: [[T5:%.*]] = and i32 [[TMP1]], 2147483647
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; CHECK-NEXT: ret i32 [[T5]]
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;
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%t0 = add i32 %nbits, -1
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%t1 = shl i32 -1, %t0 ; shifting by nbits-1
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%t2 = xor i32 %t1, -1
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%t3 = and i32 %t2, %x
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%t4 = sub i32 32, %nbits
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call void @use32(i32 %t0)
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call void @use32(i32 %t1)
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call void @use32(i32 %t2)
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call void @use32(i32 %t4)
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%t5 = shl i32 %t3, %t4
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ret i32 %t5
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}
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; Vectors
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declare void @use8xi32(<8 x i32>)
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define <8 x i32> @t1_vec_splat(<8 x i32> %x, <8 x i32> %nbits) {
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; CHECK-LABEL: @t1_vec_splat(
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; CHECK-NEXT: [[T0:%.*]] = add <8 x i32> [[NBITS:%.*]], <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
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; CHECK-NEXT: [[T1:%.*]] = shl <8 x i32> <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>, [[T0]]
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; CHECK-NEXT: [[T2:%.*]] = xor <8 x i32> [[T1]], <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
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; CHECK-NEXT: [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T0]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T1]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T2]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T4]])
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; CHECK-NEXT: [[TMP1:%.*]] = shl <8 x i32> [[X:%.*]], [[T4]]
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; CHECK-NEXT: [[T5:%.*]] = and <8 x i32> [[TMP1]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
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; CHECK-NEXT: ret <8 x i32> [[T5]]
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;
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%t0 = add <8 x i32> %nbits, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
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%t1 = shl <8 x i32> <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>, %t0
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%t2 = xor <8 x i32> %t1, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
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%t3 = and <8 x i32> %t2, %x
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%t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
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call void @use8xi32(<8 x i32> %t0)
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call void @use8xi32(<8 x i32> %t1)
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call void @use8xi32(<8 x i32> %t2)
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call void @use8xi32(<8 x i32> %t4)
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%t5 = shl <8 x i32> %t3, %t4
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ret <8 x i32> %t5
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}
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define <8 x i32> @t1_vec_splat_undef(<8 x i32> %x, <8 x i32> %nbits) {
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; CHECK-LABEL: @t1_vec_splat_undef(
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; CHECK-NEXT: [[T0:%.*]] = add <8 x i32> [[NBITS:%.*]], <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>
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; CHECK-NEXT: [[T1:%.*]] = shl <8 x i32> <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>, [[T0]]
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; CHECK-NEXT: [[T2:%.*]] = xor <8 x i32> [[T1]], <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>
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; CHECK-NEXT: [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, [[NBITS]]
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T0]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T1]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T2]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T4]])
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; CHECK-NEXT: [[TMP1:%.*]] = shl <8 x i32> [[X:%.*]], [[T4]]
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; CHECK-NEXT: [[T5:%.*]] = and <8 x i32> [[TMP1]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 undef, i32 2147483647>
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; CHECK-NEXT: ret <8 x i32> [[T5]]
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;
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%t0 = add <8 x i32> %nbits, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>
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%t1 = shl <8 x i32> <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>, %t0
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%t2 = xor <8 x i32> %t1, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>
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%t3 = and <8 x i32> %t2, %x
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%t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, %nbits
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call void @use8xi32(<8 x i32> %t0)
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call void @use8xi32(<8 x i32> %t1)
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call void @use8xi32(<8 x i32> %t2)
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call void @use8xi32(<8 x i32> %t4)
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%t5 = shl <8 x i32> %t3, %t4
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ret <8 x i32> %t5
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}
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define <8 x i32> @t2_vec_nonsplat(<8 x i32> %x, <8 x i32> %nbits) {
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; CHECK-LABEL: @t2_vec_nonsplat(
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; CHECK-NEXT: [[T0:%.*]] = add <8 x i32> [[NBITS:%.*]], <i32 -33, i32 -32, i32 -31, i32 -1, i32 0, i32 1, i32 31, i32 32>
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; CHECK-NEXT: [[T1:%.*]] = shl <8 x i32> <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>, [[T0]]
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; CHECK-NEXT: [[T2:%.*]] = xor <8 x i32> [[T1]], <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
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; CHECK-NEXT: [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T0]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T1]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T2]])
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; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T4]])
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; CHECK-NEXT: [[TMP1:%.*]] = shl <8 x i32> [[X:%.*]], [[T4]]
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; CHECK-NEXT: [[T5:%.*]] = and <8 x i32> [[TMP1]], <i32 undef, i32 0, i32 1, i32 2147483647, i32 -1, i32 -1, i32 -1, i32 undef>
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; CHECK-NEXT: ret <8 x i32> [[T5]]
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;
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%t0 = add <8 x i32> %nbits, <i32 -33, i32 -32, i32 -31, i32 -1, i32 0, i32 1, i32 31, i32 32>
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%t1 = shl <8 x i32> <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>, %t0
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%t2 = xor <8 x i32> %t1, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
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%t3 = and <8 x i32> %t2, %x
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%t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
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call void @use8xi32(<8 x i32> %t0)
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call void @use8xi32(<8 x i32> %t1)
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call void @use8xi32(<8 x i32> %t2)
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call void @use8xi32(<8 x i32> %t4)
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%t5 = shl <8 x i32> %t3, %t4
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ret <8 x i32> %t5
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}
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; Extra uses.
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define i32 @n3_extrause(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @n3_extrause(
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; CHECK-NEXT: [[T0:%.*]] = add i32 [[NBITS:%.*]], -1
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; CHECK-NEXT: [[T1:%.*]] = shl i32 -1, [[T0]]
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; CHECK-NEXT: [[T2:%.*]] = xor i32 [[T1]], -1
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; CHECK-NEXT: [[T3:%.*]] = and i32 [[T2]], [[X:%.*]]
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; CHECK-NEXT: [[T4:%.*]] = sub i32 32, [[NBITS]]
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; CHECK-NEXT: call void @use32(i32 [[T0]])
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; CHECK-NEXT: call void @use32(i32 [[T1]])
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; CHECK-NEXT: call void @use32(i32 [[T2]])
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; CHECK-NEXT: call void @use32(i32 [[T3]])
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; CHECK-NEXT: call void @use32(i32 [[T4]])
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; CHECK-NEXT: [[T5:%.*]] = shl i32 [[T3]], [[T4]]
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; CHECK-NEXT: ret i32 [[T5]]
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;
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%t0 = add i32 %nbits, -1
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%t1 = shl i32 -1, %t0 ; shifting by nbits-1
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%t2 = xor i32 %t1, -1
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%t3 = and i32 %t2, %x ; this mask must be one-use.
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%t4 = sub i32 32, %nbits
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call void @use32(i32 %t0)
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call void @use32(i32 %t1)
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call void @use32(i32 %t2)
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call void @use32(i32 %t3) ; BAD
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call void @use32(i32 %t4)
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%t5 = shl i32 %t3, %t4
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ret i32 %t5
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}
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