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llvm-mirror/test/Transforms/InstCombine/redundant-left-shift-input-masking-variant-b.ll
Sanjay Patel bf8ef9fdc3 [InstCombine] use redirect of input file in regression tests; NFC 
This is a repeat of 1880092722 from 2009. We should have less risk
of hitting bugs at this point because we auto-generate positive CHECK
lines only, but this makes things consistent.

Copying the original commit msg:
"Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename."
2020-09-29 11:06:25 -04:00

385 lines
14 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; If we have some pattern that leaves only some low bits set, and then performs
; left-shift of those bits, if none of the bits that are left after the final
; shift are modified by the mask, we can omit the mask.
; There are many variants to this pattern:
; b) (x & (~(-1 << maskNbits))) << shiftNbits
; simplify to:
; x << shiftNbits
; iff (maskNbits+shiftNbits) u>= bitwidth(x)
; Simple tests. We don't care about extra uses.
declare void @use32(i32)
define i32 @t0_basic(i32 %x, i32 %nbits) {
; CHECK-LABEL: @t0_basic(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[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 [[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 i32 %t2, %t3
ret i32 %t4
}
define i32 @t1_bigger_shift(i32 %x, i32 %nbits) {
; CHECK-LABEL: @t1_bigger_shift(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]]
; CHECK-NEXT: [[T3:%.*]] = sub i32 33, [[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 [[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 33, %nbits ; subtracting from bitwidth+1
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
}
define i32 @t2_bigger_mask(i32 %x, i32 %nbits) {
; CHECK-LABEL: @t2_bigger_mask(
; CHECK-NEXT: [[T0:%.*]] = add i32 [[NBITS:%.*]], 1
; CHECK-NEXT: [[T1:%.*]] = shl i32 -1, [[T0]]
; CHECK-NEXT: [[T2:%.*]] = xor i32 [[T1]], -1
; CHECK-NEXT: [[T3:%.*]] = and i32 [[T2]], [[X:%.*]]
; CHECK-NEXT: [[T4:%.*]] = 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: call void @use32(i32 [[T4]])
; CHECK-NEXT: [[T5:%.*]] = shl i32 [[X]], [[T4]]
; CHECK-NEXT: ret i32 [[T5]]
;
%t0 = add i32 %nbits, 1
%t1 = shl i32 -1, %t0 ; shifting by nbits+1
%t2 = xor i32 %t1, -1
%t3 = and i32 %t2, %x
%t4 = sub i32 32, %nbits
call void @use32(i32 %t0)
call void @use32(i32 %t1)
call void @use32(i32 %t2)
call void @use32(i32 %t3)
call void @use32(i32 %t4)
%t5 = shl i32 %t3, %t4
ret i32 %t5
}
; Vectors
declare void @use3xi32(<3 x i32>)
define <3 x i32> @t3_vec_splat(<3 x i32> %x, <3 x i32> %nbits) {
; CHECK-LABEL: @t3_vec_splat(
; CHECK-NEXT: [[T1:%.*]] = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, [[NBITS:%.*]]
; CHECK-NEXT: [[T2:%.*]] = xor <3 x i32> [[T1]], <i32 -1, i32 -1, i32 -1>
; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]]
; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 32, i32 32, i32 32>, [[NBITS]]
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[NBITS]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]])
; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]]
; CHECK-NEXT: ret <3 x i32> [[T5]]
;
%t0 = add <3 x i32> %nbits, <i32 0, i32 0, i32 0>
%t1 = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, %t0
%t2 = xor <3 x i32> %t1, <i32 -1, i32 -1, i32 -1>
%t3 = and <3 x i32> %t2, %x
%t4 = sub <3 x i32> <i32 32, i32 32, i32 32>, %nbits
call void @use3xi32(<3 x i32> %t0)
call void @use3xi32(<3 x i32> %t1)
call void @use3xi32(<3 x i32> %t2)
call void @use3xi32(<3 x i32> %t3)
call void @use3xi32(<3 x i32> %t4)
%t5 = shl <3 x i32> %t3, %t4
ret <3 x i32> %t5
}
define <3 x i32> @t4_vec_nonsplat(<3 x i32> %x, <3 x i32> %nbits) {
; CHECK-LABEL: @t4_vec_nonsplat(
; CHECK-NEXT: [[T0:%.*]] = add <3 x i32> [[NBITS:%.*]], <i32 -1, i32 0, i32 1>
; CHECK-NEXT: [[T1:%.*]] = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, [[T0]]
; CHECK-NEXT: [[T2:%.*]] = xor <3 x i32> [[T1]], <i32 -1, i32 -1, i32 -1>
; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]]
; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 33, i32 32, i32 32>, [[NBITS]]
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T0]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]])
; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]]
; CHECK-NEXT: ret <3 x i32> [[T5]]
;
%t0 = add <3 x i32> %nbits, <i32 -1, i32 0, i32 1>
%t1 = shl <3 x i32> <i32 -1, i32 -1, i32 -1>, %t0
%t2 = xor <3 x i32> %t1, <i32 -1, i32 -1, i32 -1>
%t3 = and <3 x i32> %t2, %x
%t4 = sub <3 x i32> <i32 33, i32 32, i32 32>, %nbits
call void @use3xi32(<3 x i32> %t0)
call void @use3xi32(<3 x i32> %t1)
call void @use3xi32(<3 x i32> %t2)
call void @use3xi32(<3 x i32> %t3)
call void @use3xi32(<3 x i32> %t4)
%t5 = shl <3 x i32> %t3, %t4
ret <3 x i32> %t5
}
define <3 x i32> @t5_vec_undef(<3 x i32> %x, <3 x i32> %nbits) {
; CHECK-LABEL: @t5_vec_undef(
; CHECK-NEXT: [[T1:%.*]] = shl <3 x i32> <i32 -1, i32 undef, i32 -1>, [[NBITS:%.*]]
; CHECK-NEXT: [[T2:%.*]] = xor <3 x i32> [[T1]], <i32 -1, i32 undef, i32 -1>
; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]]
; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 32, i32 undef, i32 32>, [[NBITS]]
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[NBITS]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]])
; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]])
; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]]
; CHECK-NEXT: ret <3 x i32> [[T5]]
;
%t0 = add <3 x i32> %nbits, <i32 0, i32 undef, i32 0>
%t1 = shl <3 x i32> <i32 -1, i32 undef, i32 -1>, %t0
%t2 = xor <3 x i32> %t1, <i32 -1, i32 undef, i32 -1>
%t3 = and <3 x i32> %t2, %x
%t4 = sub <3 x i32> <i32 32, i32 undef, i32 32>, %nbits
call void @use3xi32(<3 x i32> %t0)
call void @use3xi32(<3 x i32> %t1)
call void @use3xi32(<3 x i32> %t2)
call void @use3xi32(<3 x i32> %t3)
call void @use3xi32(<3 x i32> %t4)
%t5 = shl <3 x i32> %t3, %t4
ret <3 x i32> %t5
}
; Commutativity
declare i32 @gen32()
define i32 @t6_commutativity0(i32 %nbits) {
; CHECK-LABEL: @t6_commutativity0(
; CHECK-NEXT: [[X:%.*]] = call i32 @gen32()
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS:%.*]]
; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
; CHECK-NEXT: [[T2:%.*]] = and i32 [[X]], [[T1]]
; 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 [[X]], [[T3]]
; CHECK-NEXT: ret i32 [[T4]]
;
%x = call i32 @gen32()
%t0 = shl i32 -1, %nbits
%t1 = xor i32 %t0, -1
%t2 = and i32 %x, %t1 ; swapped
%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
}
define i32 @t7_commutativity1(i32 %nbits0, i32 %nbits1) {
; CHECK-LABEL: @t7_commutativity1(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS0:%.*]]
; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
; CHECK-NEXT: [[T2:%.*]] = shl i32 -1, [[NBITS1:%.*]]
; CHECK-NEXT: [[T3:%.*]] = xor i32 [[T2]], -1
; CHECK-NEXT: [[T4:%.*]] = and i32 [[T3]], [[T1]]
; CHECK-NEXT: [[T5:%.*]] = sub i32 32, [[NBITS0]]
; 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: call void @use32(i32 [[T4]])
; CHECK-NEXT: call void @use32(i32 [[T5]])
; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T4]], [[T5]]
; CHECK-NEXT: ret i32 [[T6]]
;
%t0 = shl i32 -1, %nbits0
%t1 = xor i32 %t0, -1
%t2 = shl i32 -1, %nbits1
%t3 = xor i32 %t2, -1
%t4 = and i32 %t3, %t1 ; both hands of 'and' could be mask..
%t5 = sub i32 32, %nbits0
call void @use32(i32 %t0)
call void @use32(i32 %t1)
call void @use32(i32 %t2)
call void @use32(i32 %t3)
call void @use32(i32 %t4)
call void @use32(i32 %t5)
%t6 = shl i32 %t4, %t5
ret i32 %t6
}
define i32 @t8_commutativity2(i32 %nbits0, i32 %nbits1) {
; CHECK-LABEL: @t8_commutativity2(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[NBITS0:%.*]]
; CHECK-NEXT: [[T1:%.*]] = xor i32 [[T0]], -1
; CHECK-NEXT: [[T2:%.*]] = shl i32 -1, [[NBITS1:%.*]]
; CHECK-NEXT: [[T3:%.*]] = xor i32 [[T2]], -1
; CHECK-NEXT: [[T4:%.*]] = and i32 [[T3]], [[T1]]
; CHECK-NEXT: [[T5:%.*]] = sub i32 32, [[NBITS1]]
; 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: call void @use32(i32 [[T4]])
; CHECK-NEXT: call void @use32(i32 [[T5]])
; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T1]], [[T5]]
; CHECK-NEXT: ret i32 [[T6]]
;
%t0 = shl i32 -1, %nbits0
%t1 = xor i32 %t0, -1
%t2 = shl i32 -1, %nbits1
%t3 = xor i32 %t2, -1
%t4 = and i32 %t3, %t1 ; both hands of 'and' could be mask..
%t5 = sub i32 32, %nbits1
call void @use32(i32 %t0)
call void @use32(i32 %t1)
call void @use32(i32 %t2)
call void @use32(i32 %t3)
call void @use32(i32 %t4)
call void @use32(i32 %t5)
%t6 = shl i32 %t4, %t5
ret i32 %t6
}
; Fast-math flags. We must not preserve them!
define i32 @t9_nuw(i32 %x, i32 %nbits) {
; CHECK-LABEL: @t9_nuw(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[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 [[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 i32 %t2, %t3
ret i32 %t4
}
define i32 @t10_nsw(i32 %x, i32 %nbits) {
; CHECK-LABEL: @t10_nsw(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[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 [[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 nsw i32 %t2, %t3
ret i32 %t4
}
define i32 @t11_nuw_nsw(i32 %x, i32 %nbits) {
; CHECK-LABEL: @t11_nuw_nsw(
; CHECK-NEXT: [[T0:%.*]] = shl i32 -1, [[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 [[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
}
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