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|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; a & (a ^ b) --> a & ~b
define i32 @and_xor_common_op(i32 %pa, i32 %pb) {
; CHECK-LABEL: @and_xor_common_op(
; CHECK-NEXT: [[A:%.*]] = udiv i32 42, [[PA:%.*]]
; CHECK-NEXT: [[B:%.*]] = udiv i32 43, [[PB:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = xor i32 [[B]], -1
; CHECK-NEXT: [[R:%.*]] = and i32 [[A]], [[TMP1]]
; CHECK-NEXT: ret i32 [[R]]
;
%a = udiv i32 42, %pa ; thwart complexity-based canonicalization
%b = udiv i32 43, %pb ; thwart complexity-based canonicalization
%xor = xor i32 %a, %b
%r = and i32 %a, %xor
ret i32 %r
}
; a & (b ^ a) --> a & ~b
define i32 @and_xor_common_op_commute1(i32 %pa, i32 %pb) {
; CHECK-LABEL: @and_xor_common_op_commute1(
; CHECK-NEXT: [[A:%.*]] = udiv i32 42, [[PA:%.*]]
; CHECK-NEXT: [[B:%.*]] = udiv i32 43, [[PB:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = xor i32 [[B]], -1
; CHECK-NEXT: [[R:%.*]] = and i32 [[A]], [[TMP1]]
; CHECK-NEXT: ret i32 [[R]]
;
%a = udiv i32 42, %pa ; thwart complexity-based canonicalization
%b = udiv i32 43, %pb ; thwart complexity-based canonicalization
%xor = xor i32 %b, %a
%r = and i32 %a, %xor
ret i32 %r
}
; (b ^ a) & a --> a & ~b
define i32 @and_xor_common_op_commute2(i32 %pa, i32 %pb) {
; CHECK-LABEL: @and_xor_common_op_commute2(
; CHECK-NEXT: [[A:%.*]] = udiv i32 42, [[PA:%.*]]
; CHECK-NEXT: [[B:%.*]] = udiv i32 43, [[PB:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = xor i32 [[B]], -1
; CHECK-NEXT: [[R:%.*]] = and i32 [[A]], [[TMP1]]
; CHECK-NEXT: ret i32 [[R]]
;
%a = udiv i32 42, %pa ; thwart complexity-based canonicalization
%b = udiv i32 43, %pb ; thwart complexity-based canonicalization
%xor = xor i32 %b, %a
%r = and i32 %xor, %a
ret i32 %r
}
; (a ^ b) & a --> a & ~b
define <2 x i32> @and_xor_common_op_commute3(<2 x i32> %pa, <2 x i32> %pb) {
; CHECK-LABEL: @and_xor_common_op_commute3(
; CHECK-NEXT: [[A:%.*]] = udiv <2 x i32> <i32 42, i32 43>, [[PA:%.*]]
; CHECK-NEXT: [[B:%.*]] = udiv <2 x i32> <i32 43, i32 42>, [[PB:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = xor <2 x i32> [[B]], <i32 -1, i32 -1>
; CHECK-NEXT: [[R:%.*]] = and <2 x i32> [[A]], [[TMP1]]
; CHECK-NEXT: ret <2 x i32> [[R]]
;
%a = udiv <2 x i32> <i32 42, i32 43>, %pa ; thwart complexity-based canonicalization
%b = udiv <2 x i32> <i32 43, i32 42>, %pb ; thwart complexity-based canonicalization
%xor = xor <2 x i32> %a, %b
%r = and <2 x i32> %xor, %a
ret <2 x i32> %r
}
; It's ok to match a common constant.
; TODO: The xor should be a 'not' op (-1 constant), but demanded bits shrinks it.
define <4 x i32> @and_xor_common_op_constant(<4 x i32> %A) {
; CHECK-LABEL: @and_xor_common_op_constant(
; CHECK-NEXT: [[TMP1:%.*]] = xor <4 x i32> [[A:%.*]], <i32 7, i32 7, i32 7, i32 7>
; CHECK-NEXT: [[TMP2:%.*]] = and <4 x i32> [[TMP1]], <i32 1, i32 2, i32 3, i32 4>
; CHECK-NEXT: ret <4 x i32> [[TMP2]]
;
%1 = xor <4 x i32> %A, <i32 1, i32 2, i32 3, i32 4>
%2 = and <4 x i32> <i32 1, i32 2, i32 3, i32 4>, %1
ret <4 x i32> %2
}
; a & (a ^ ~b) --> a & b
define i32 @and_xor_not_common_op(i32 %a, i32 %b) {
; CHECK-LABEL: @and_xor_not_common_op(
; CHECK-NEXT: [[T4:%.*]] = and i32 [[B:%.*]], [[A:%.*]]
; CHECK-NEXT: ret i32 [[T4]]
;
%b2 = xor i32 %b, -1
%t2 = xor i32 %a, %b2
%t4 = and i32 %t2, %a
ret i32 %t4
}
; rdar://10770603
; (x & y) | (x ^ y) -> x | y
define i64 @or(i64 %x, i64 %y) {
; CHECK-LABEL: @or(
; CHECK-NEXT: [[TMP1:%.*]] = or i64 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: ret i64 [[TMP1]]
;
%1 = and i64 %y, %x
%2 = xor i64 %y, %x
%3 = add i64 %1, %2
ret i64 %3
}
; (x & y) + (x ^ y) -> x | y
define i64 @or2(i64 %x, i64 %y) {
; CHECK-LABEL: @or2(
; CHECK-NEXT: [[TMP1:%.*]] = or i64 [[Y:%.*]], [[X:%.*]]
; CHECK-NEXT: ret i64 [[TMP1]]
;
%1 = and i64 %y, %x
%2 = xor i64 %y, %x
%3 = or i64 %1, %2
ret i64 %3
}
; PR37098 - https://bugs.llvm.org/show_bug.cgi?id=37098
; Reassociate bitwise logic to eliminate a shift.
; There are 4 commuted * 3 shift ops * 3 logic ops = 36 potential variations of this fold.
; Mix the commutation options to provide coverage using less tests.
define i8 @and_shl(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @and_shl(
; CHECK-NEXT: [[SX:%.*]] = shl i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = shl i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = and i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[SY]], [[A]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = shl i8 %x, %shamt
%sy = shl i8 %y, %shamt
%a = and i8 %sx, %z
%r = and i8 %sy, %a
ret i8 %r
}
define i8 @or_shl(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @or_shl(
; CHECK-NEXT: [[SX:%.*]] = shl i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = shl i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = or i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = or i8 [[A]], [[SY]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = shl i8 %x, %shamt
%sy = shl i8 %y, %shamt
%a = or i8 %sx, %z
%r = or i8 %a, %sy
ret i8 %r
}
define i8 @xor_shl(i8 %x, i8 %y, i8 %zarg, i8 %shamt) {
; CHECK-LABEL: @xor_shl(
; CHECK-NEXT: [[Z:%.*]] = sdiv i8 42, [[ZARG:%.*]]
; CHECK-NEXT: [[SX:%.*]] = shl i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = shl i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = xor i8 [[Z]], [[SX]]
; CHECK-NEXT: [[R:%.*]] = xor i8 [[A]], [[SY]]
; CHECK-NEXT: ret i8 [[R]]
;
%z = sdiv i8 42, %zarg ; thwart complexity-based canonicalization
%sx = shl i8 %x, %shamt
%sy = shl i8 %y, %shamt
%a = xor i8 %z, %sx
%r = xor i8 %a, %sy
ret i8 %r
}
define i8 @and_lshr(i8 %x, i8 %y, i8 %zarg, i8 %shamt) {
; CHECK-LABEL: @and_lshr(
; CHECK-NEXT: [[Z:%.*]] = sdiv i8 42, [[ZARG:%.*]]
; CHECK-NEXT: [[SX:%.*]] = lshr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = lshr i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = and i8 [[Z]], [[SX]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[SY]], [[A]]
; CHECK-NEXT: ret i8 [[R]]
;
%z = sdiv i8 42, %zarg ; thwart complexity-based canonicalization
%sx = lshr i8 %x, %shamt
%sy = lshr i8 %y, %shamt
%a = and i8 %z, %sx
%r = and i8 %sy, %a
ret i8 %r
}
define i8 @or_lshr(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @or_lshr(
; CHECK-NEXT: [[SX:%.*]] = lshr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = lshr i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = or i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = or i8 [[SY]], [[A]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = lshr i8 %x, %shamt
%sy = lshr i8 %y, %shamt
%a = or i8 %sx, %z
%r = or i8 %sy, %a
ret i8 %r
}
define i8 @xor_lshr(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @xor_lshr(
; CHECK-NEXT: [[SX:%.*]] = lshr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = lshr i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = xor i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = xor i8 [[A]], [[SY]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = lshr i8 %x, %shamt
%sy = lshr i8 %y, %shamt
%a = xor i8 %sx, %z
%r = xor i8 %a, %sy
ret i8 %r
}
define i8 @and_ashr(i8 %x, i8 %y, i8 %zarg, i8 %shamt) {
; CHECK-LABEL: @and_ashr(
; CHECK-NEXT: [[Z:%.*]] = sdiv i8 42, [[ZARG:%.*]]
; CHECK-NEXT: [[SX:%.*]] = ashr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = ashr i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = and i8 [[Z]], [[SX]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[A]], [[SY]]
; CHECK-NEXT: ret i8 [[R]]
;
%z = sdiv i8 42, %zarg ; thwart complexity-based canonicalization
%sx = ashr i8 %x, %shamt
%sy = ashr i8 %y, %shamt
%a = and i8 %z, %sx
%r = and i8 %a, %sy
ret i8 %r
}
define i8 @or_ashr(i8 %x, i8 %y, i8 %zarg, i8 %shamt) {
; CHECK-LABEL: @or_ashr(
; CHECK-NEXT: [[Z:%.*]] = sdiv i8 42, [[ZARG:%.*]]
; CHECK-NEXT: [[SX:%.*]] = ashr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = ashr i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = or i8 [[Z]], [[SX]]
; CHECK-NEXT: [[R:%.*]] = or i8 [[SY]], [[A]]
; CHECK-NEXT: ret i8 [[R]]
;
%z = sdiv i8 42, %zarg ; thwart complexity-based canonicalization
%sx = ashr i8 %x, %shamt
%sy = ashr i8 %y, %shamt
%a = or i8 %z, %sx
%r = or i8 %sy, %a
ret i8 %r
}
define <2 x i8> @xor_ashr(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z, <2 x i8> %shamt) {
; CHECK-LABEL: @xor_ashr(
; CHECK-NEXT: [[SX:%.*]] = ashr <2 x i8> [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = ashr <2 x i8> [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = xor <2 x i8> [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = xor <2 x i8> [[A]], [[SY]]
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%sx = ashr <2 x i8> %x, %shamt
%sy = ashr <2 x i8> %y, %shamt
%a = xor <2 x i8> %sx, %z
%r = xor <2 x i8> %a, %sy
ret <2 x i8> %r
}
; Negative test - different logic ops
define i8 @or_and_shl(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @or_and_shl(
; CHECK-NEXT: [[SX:%.*]] = shl i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = shl i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = or i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[SY]], [[A]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = shl i8 %x, %shamt
%sy = shl i8 %y, %shamt
%a = or i8 %sx, %z
%r = and i8 %sy, %a
ret i8 %r
}
; Negative test - different shift ops
define i8 @or_lshr_shl(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @or_lshr_shl(
; CHECK-NEXT: [[SX:%.*]] = lshr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = shl i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = or i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = or i8 [[A]], [[SY]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = lshr i8 %x, %shamt
%sy = shl i8 %y, %shamt
%a = or i8 %sx, %z
%r = or i8 %a, %sy
ret i8 %r
}
; Negative test - different shift amounts
define i8 @or_lshr_shamt2(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @or_lshr_shamt2(
; CHECK-NEXT: [[SX:%.*]] = lshr i8 [[X:%.*]], 5
; CHECK-NEXT: [[SY:%.*]] = lshr i8 [[Y:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[A:%.*]] = or i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = or i8 [[SY]], [[A]]
; CHECK-NEXT: ret i8 [[R]]
;
%sx = lshr i8 %x, 5
%sy = lshr i8 %y, %shamt
%a = or i8 %sx, %z
%r = or i8 %sy, %a
ret i8 %r
}
; Negative test - multi-use
define i8 @xor_lshr_multiuse(i8 %x, i8 %y, i8 %z, i8 %shamt) {
; CHECK-LABEL: @xor_lshr_multiuse(
; CHECK-NEXT: [[SX:%.*]] = lshr i8 [[X:%.*]], [[SHAMT:%.*]]
; CHECK-NEXT: [[SY:%.*]] = lshr i8 [[Y:%.*]], [[SHAMT]]
; CHECK-NEXT: [[A:%.*]] = xor i8 [[SX]], [[Z:%.*]]
; CHECK-NEXT: [[R:%.*]] = xor i8 [[A]], [[SY]]
; CHECK-NEXT: [[R2:%.*]] = sdiv i8 [[A]], [[R]]
; CHECK-NEXT: ret i8 [[R2]]
;
%sx = lshr i8 %x, %shamt
%sy = lshr i8 %y, %shamt
%a = xor i8 %sx, %z
%r = xor i8 %a, %sy
%r2 = sdiv i8 %a, %r
ret i8 %r2
}
|
