385 lines
14 KiB
LLVM
385 lines
14 KiB
LLVM
; 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, if none of the bits that are left after the final
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; shift are modified by the mask, we can omit the 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
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; iff (maskNbits+shiftNbits) u>= bitwidth(x)
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; Simple tests. We don't care about extra uses.
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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:%.*]] = shl i32 -1, [[NBITS:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = 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: [[T4:%.*]] = shl i32 [[X]], [[T3]]
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; CHECK-NEXT: ret i32 [[T4]]
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;
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%t0 = shl i32 -1, %nbits
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%t1 = xor i32 %t0, -1
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%t2 = and i32 %t1, %x
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%t3 = 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)
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%t4 = shl i32 %t2, %t3
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ret i32 %t4
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}
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define i32 @t1_bigger_shift(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @t1_bigger_shift(
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = sub i32 33, [[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: [[T4:%.*]] = shl i32 [[X]], [[T3]]
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; CHECK-NEXT: ret i32 [[T4]]
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;
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%t0 = shl i32 -1, %nbits
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%t1 = xor i32 %t0, -1
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%t2 = and i32 %t1, %x
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%t3 = sub i32 33, %nbits ; subtracting from bitwidth+1
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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)
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%t4 = shl i32 %t2, %t3
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ret i32 %t4
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}
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define i32 @t2_bigger_mask(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @t2_bigger_mask(
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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 [[X]], [[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
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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)
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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 @use3xi32(<3 x i32>)
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define <3 x i32> @t3_vec_splat(<3 x i32> %x, <3 x i32> %nbits) {
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; CHECK-LABEL: @t3_vec_splat(
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; CHECK-NEXT: [[T1:%.*]] = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, [[NBITS:%.*]]
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; CHECK-NEXT: [[T2:%.*]] = xor <3 x i32> [[T1]], <i32 -1, i32 -1, i32 -1>
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; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]]
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; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 32, i32 32, i32 32>, [[NBITS]]
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[NBITS]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]])
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; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]]
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; CHECK-NEXT: ret <3 x i32> [[T5]]
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;
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%t0 = add <3 x i32> %nbits, <i32 0, i32 0, i32 0>
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%t1 = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, %t0
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%t2 = xor <3 x i32> %t1, <i32 -1, i32 -1, i32 -1>
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%t3 = and <3 x i32> %t2, %x
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%t4 = sub <3 x i32> <i32 32, i32 32, i32 32>, %nbits
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call void @use3xi32(<3 x i32> %t0)
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call void @use3xi32(<3 x i32> %t1)
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call void @use3xi32(<3 x i32> %t2)
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call void @use3xi32(<3 x i32> %t3)
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call void @use3xi32(<3 x i32> %t4)
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%t5 = shl <3 x i32> %t3, %t4
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ret <3 x i32> %t5
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}
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define <3 x i32> @t4_vec_nonsplat(<3 x i32> %x, <3 x i32> %nbits) {
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; CHECK-LABEL: @t4_vec_nonsplat(
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; CHECK-NEXT: [[T0:%.*]] = add <3 x i32> [[NBITS:%.*]], <i32 -1, i32 0, i32 1>
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; CHECK-NEXT: [[T1:%.*]] = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, [[T0]]
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; CHECK-NEXT: [[T2:%.*]] = xor <3 x i32> [[T1]], <i32 -1, i32 -1, i32 -1>
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; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]]
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; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 33, i32 32, i32 32>, [[NBITS]]
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T0]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]])
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; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]]
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; CHECK-NEXT: ret <3 x i32> [[T5]]
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;
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%t0 = add <3 x i32> %nbits, <i32 -1, i32 0, i32 1>
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%t1 = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, %t0
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%t2 = xor <3 x i32> %t1, <i32 -1, i32 -1, i32 -1>
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%t3 = and <3 x i32> %t2, %x
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%t4 = sub <3 x i32> <i32 33, i32 32, i32 32>, %nbits
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call void @use3xi32(<3 x i32> %t0)
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call void @use3xi32(<3 x i32> %t1)
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call void @use3xi32(<3 x i32> %t2)
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call void @use3xi32(<3 x i32> %t3)
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call void @use3xi32(<3 x i32> %t4)
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%t5 = shl <3 x i32> %t3, %t4
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ret <3 x i32> %t5
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}
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define <3 x i32> @t5_vec_undef(<3 x i32> %x, <3 x i32> %nbits) {
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; CHECK-LABEL: @t5_vec_undef(
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; CHECK-NEXT: [[T1:%.*]] = shl <3 x i32> <i32 -1, i32 undef, i32 -1>, [[NBITS:%.*]]
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; CHECK-NEXT: [[T2:%.*]] = xor <3 x i32> [[T1]], <i32 -1, i32 undef, i32 -1>
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; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]]
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; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 32, i32 undef, i32 32>, [[NBITS]]
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[NBITS]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]])
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; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]])
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; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]]
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; CHECK-NEXT: ret <3 x i32> [[T5]]
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;
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%t0 = add <3 x i32> %nbits, <i32 0, i32 undef, i32 0>
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%t1 = shl <3 x i32> <i32 -1, i32 undef, i32 -1>, %t0
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%t2 = xor <3 x i32> %t1, <i32 -1, i32 undef, i32 -1>
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%t3 = and <3 x i32> %t2, %x
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%t4 = sub <3 x i32> <i32 32, i32 undef, i32 32>, %nbits
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call void @use3xi32(<3 x i32> %t0)
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call void @use3xi32(<3 x i32> %t1)
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call void @use3xi32(<3 x i32> %t2)
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call void @use3xi32(<3 x i32> %t3)
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call void @use3xi32(<3 x i32> %t4)
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%t5 = shl <3 x i32> %t3, %t4
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ret <3 x i32> %t5
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}
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; Commutativity
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declare i32 @gen32()
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define i32 @t6_commutativity0(i32 %nbits) {
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; CHECK-LABEL: @t6_commutativity0(
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; CHECK-NEXT: [[X:%.*]] = call i32 @gen32()
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i32 [[X]], [[T1]]
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; CHECK-NEXT: [[T3:%.*]] = 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: [[T4:%.*]] = shl i32 [[X]], [[T3]]
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; CHECK-NEXT: ret i32 [[T4]]
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;
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%x = call i32 @gen32()
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%t0 = shl i32 -1, %nbits
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%t1 = xor i32 %t0, -1
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%t2 = and i32 %x, %t1 ; swapped
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%t3 = 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)
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%t4 = shl i32 %t2, %t3
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ret i32 %t4
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}
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define i32 @t7_commutativity1(i32 %nbits0, i32 %nbits1) {
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; CHECK-LABEL: @t7_commutativity1(
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS0:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = shl i32 -1, [[NBITS1:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = xor i32 [[T2]], -1
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; CHECK-NEXT: [[T4:%.*]] = and i32 [[T3]], [[T1]]
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; CHECK-NEXT: [[T5:%.*]] = sub i32 32, [[NBITS0]]
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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: call void @use32(i32 [[T5]])
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; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T4]], [[T5]]
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; CHECK-NEXT: ret i32 [[T6]]
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;
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%t0 = shl i32 -1, %nbits0
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%t1 = xor i32 %t0, -1
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%t2 = shl i32 -1, %nbits1
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%t3 = xor i32 %t2, -1
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%t4 = and i32 %t3, %t1 ; both hands of 'and' could be mask..
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%t5 = sub i32 32, %nbits0
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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)
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call void @use32(i32 %t4)
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call void @use32(i32 %t5)
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%t6 = shl i32 %t4, %t5
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ret i32 %t6
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}
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define i32 @t8_commutativity2(i32 %nbits0, i32 %nbits1) {
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; CHECK-LABEL: @t8_commutativity2(
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS0:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = shl i32 -1, [[NBITS1:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = xor i32 [[T2]], -1
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; CHECK-NEXT: [[T4:%.*]] = and i32 [[T3]], [[T1]]
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; CHECK-NEXT: [[T5:%.*]] = sub i32 32, [[NBITS1]]
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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: call void @use32(i32 [[T5]])
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; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T1]], [[T5]]
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; CHECK-NEXT: ret i32 [[T6]]
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;
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%t0 = shl i32 -1, %nbits0
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%t1 = xor i32 %t0, -1
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%t2 = shl i32 -1, %nbits1
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%t3 = xor i32 %t2, -1
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%t4 = and i32 %t3, %t1 ; both hands of 'and' could be mask..
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%t5 = sub i32 32, %nbits1
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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)
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call void @use32(i32 %t4)
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call void @use32(i32 %t5)
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%t6 = shl i32 %t4, %t5
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ret i32 %t6
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}
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; Fast-math flags. We must not preserve them!
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define i32 @t9_nuw(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @t9_nuw(
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = 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: [[T4:%.*]] = shl i32 [[X]], [[T3]]
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; CHECK-NEXT: ret i32 [[T4]]
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;
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%t0 = shl i32 -1, %nbits
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%t1 = xor i32 %t0, -1
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%t2 = and i32 %t1, %x
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%t3 = 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)
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%t4 = shl nuw i32 %t2, %t3
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ret i32 %t4
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}
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define i32 @t10_nsw(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @t10_nsw(
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = 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: [[T4:%.*]] = shl i32 [[X]], [[T3]]
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; CHECK-NEXT: ret i32 [[T4]]
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;
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%t0 = shl i32 -1, %nbits
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%t1 = xor i32 %t0, -1
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%t2 = and i32 %t1, %x
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%t3 = 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)
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%t4 = shl nsw i32 %t2, %t3
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ret i32 %t4
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}
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define i32 @t11_nuw_nsw(i32 %x, i32 %nbits) {
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; CHECK-LABEL: @t11_nuw_nsw(
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; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
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; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
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; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
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; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]]
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; CHECK-NEXT: call void @use32(i32 [[T0]])
|
|
; CHECK-NEXT: call void @use32(i32 [[T1]])
|
|
; CHECK-NEXT: call void @use32(i32 [[T2]])
|
|
; CHECK-NEXT: call void @use32(i32 [[T3]])
|
|
; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]]
|
|
; CHECK-NEXT: ret i32 [[T4]]
|
|
;
|
|
%t0 = shl i32 -1, %nbits
|
|
%t1 = xor i32 %t0, -1
|
|
%t2 = and i32 %t1, %x
|
|
%t3 = sub i32 32, %nbits
|
|
call void @use32(i32 %t0)
|
|
call void @use32(i32 %t1)
|
|
call void @use32(i32 %t2)
|
|
call void @use32(i32 %t3)
|
|
%t4 = shl nuw nsw i32 %t2, %t3
|
|
ret i32 %t4
|
|
}
|
|
|
|
; Negative tests
|
|
|
|
define i32 @n12_not_minus_one(i32 %x, i32 %nbits) {
|
|
; CHECK-LABEL: @n12_not_minus_one(
|
|
; CHECK-NEXT: [[T0:%.*]] = shl i32 -2, [[NBITS:%.*]]
|
|
; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
|
|
; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
|
|
; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]]
|
|
; CHECK-NEXT: call void @use32(i32 [[T0]])
|
|
; CHECK-NEXT: call void @use32(i32 [[T1]])
|
|
; CHECK-NEXT: call void @use32(i32 [[T2]])
|
|
; CHECK-NEXT: call void @use32(i32 [[T3]])
|
|
; CHECK-NEXT: [[T4:%.*]] = shl i32 [[T2]], [[T3]]
|
|
; CHECK-NEXT: ret i32 [[T4]]
|
|
;
|
|
%t0 = shl i32 -2, %nbits ; shifting not '-1'
|
|
%t1 = xor i32 %t0, -1
|
|
%t2 = and i32 %t1, %x
|
|
%t3 = sub i32 32, %nbits
|
|
call void @use32(i32 %t0)
|
|
call void @use32(i32 %t1)
|
|
call void @use32(i32 %t2)
|
|
call void @use32(i32 %t3)
|
|
%t4 = shl i32 %t2, %t3
|
|
ret i32 %t4
|
|
}
|