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ValueTracking/test: cover known bits of mul #113050

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152 changes: 152 additions & 0 deletions llvm/test/Analysis/ValueTracking/knownbits-mul.ll
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Original file line number Diff line number Diff line change
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

define i8 @mul_low_bits_know(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_low_bits_know(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: ret i8 0
;
%x = and i8 %xx, 2
%y = and i8 %yy, 4
%mul = mul i8 %x, %y
%r = and i8 %mul, 6
ret i8 %r
}

define i8 @mul_low_bits_know2(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_low_bits_know2(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: ret i8 0
;
%x = or i8 %xx, -2
%y = and i8 %yy, 4
%mul = mul i8 %x, %y
%r = and i8 %mul, 2
ret i8 %r
}

define i8 @mul_low_bits_partially_known(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_low_bits_partially_known(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[Y:%.*]] = or i8 [[YY]], 2
; CHECK-NEXT: [[MUL:%.*]] = sub nsw i8 0, [[Y]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[MUL]], 2
; CHECK-NEXT: ret i8 [[R]]
;
%x = or i8 %xx, -4
%x.notsmin = or i8 %x, 3
%y = or i8 %yy, -2
%mul = mul i8 %x.notsmin, %y
%r = and i8 %mul, 6
ret i8 %r
}

define i8 @mul_low_bits_unknown(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_low_bits_unknown(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[X:%.*]] = or i8 [[XX]], 4
; CHECK-NEXT: [[Y:%.*]] = or i8 [[YY]], 6
; CHECK-NEXT: [[MUL:%.*]] = mul i8 [[X]], [[Y]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[MUL]], 6
; CHECK-NEXT: ret i8 [[R]]
;
%x = or i8 %xx, -4
%y = or i8 %yy, -2
%mul = mul i8 %x, %y
%r = and i8 %mul, 6
ret i8 %r
}

define i8 @mul_high_bits_know(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_high_bits_know(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: ret i8 0
;
%x = and i8 %xx, 2
%y = and i8 %yy, 4
%mul = mul i8 %x, %y
%r = and i8 %mul, 16
ret i8 %r
}

define i8 @mul_high_bits_know2(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_high_bits_know2(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[X:%.*]] = or i8 [[XX]], -2
; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY]], 4
; CHECK-NEXT: [[Y_NONZERO:%.*]] = or disjoint i8 [[Y]], 1
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i8 [[X]], [[Y_NONZERO]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[MUL]], -16
; CHECK-NEXT: ret i8 [[R]]
;
%x = or i8 %xx, -2
%y = and i8 %yy, 4
%y.nonzero = or i8 %y, 1
%mul = mul i8 %x, %y.nonzero
%r = and i8 %mul, -16
ret i8 %r
}

define i8 @mul_high_bits_know3(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_high_bits_know3(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[X:%.*]] = or i8 [[XX]], 124
; CHECK-NEXT: [[Y:%.*]] = or i8 [[YY]], 126
; CHECK-NEXT: [[MUL:%.*]] = mul i8 [[X]], [[Y]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[MUL]], 112
; CHECK-NEXT: ret i8 [[R]]
;
%x = or i8 %xx, -4
%y = or i8 %yy, -2
%mul = mul i8 %x, %y
%r = and i8 %mul, -16
ret i8 %r
}

define i8 @mul_high_bits_unknown(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_high_bits_unknown(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[X:%.*]] = and i8 [[XX]], 2
; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY]], 4
; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i8 [[X]], [[Y]]
; CHECK-NEXT: ret i8 [[MUL]]
;
%x = and i8 %xx, 2
%y = and i8 %yy, 4
%mul = mul i8 %x, %y
%r = and i8 %mul, 8
ret i8 %r
}

define i8 @mul_high_bits_unknown2(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_high_bits_unknown2(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[X:%.*]] = or i8 [[XX]], -2
; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY]], 4
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i8 [[X]], [[Y]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[MUL]], -16
; CHECK-NEXT: ret i8 [[R]]
;
%x = or i8 %xx, -2
%y = and i8 %yy, 4
%mul = mul i8 %x, %y
%r = and i8 %mul, -16
ret i8 %r
}

; TODO: This can be reduced to zero.
define i8 @mul_high_bits_unknown3(i8 %xx, i8 %yy) {
; CHECK-LABEL: define i8 @mul_high_bits_unknown3(
; CHECK-SAME: i8 [[XX:%.*]], i8 [[YY:%.*]]) {
; CHECK-NEXT: [[X:%.*]] = or i8 [[XX]], 28
; CHECK-NEXT: [[Y:%.*]] = or i8 [[YY]], 30
; CHECK-NEXT: [[MUL:%.*]] = mul i8 [[X]], [[Y]]
; CHECK-NEXT: [[R:%.*]] = and i8 [[MUL]], 16
; CHECK-NEXT: ret i8 [[R]]
;
%x = or i8 %xx, -4
%y = or i8 %yy, -2
%mul = mul i8 %x, %y
%r = and i8 %mul, 16
ret i8 %r
}
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