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[NFC][InstCombine] Add some more tests for negation sinking into mul

This commit is contained in:
Roman Lebedev 2020-08-06 22:43:39 +03:00
parent 7ce76b06ec
commit a404acb86a
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2 changed files with 93 additions and 0 deletions
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80
llvm/test/Transforms/InstCombine/mul.ll
View File

@ -1003,3 +1003,83 @@ define <2 x i32> @muladd2_vec_nonuniform_undef(<2 x i32> %a0) {
%mul = mul <2 x i32> %add, <i32 -4, i32 undef>
ret <2 x i32> %mul
}
define i32 @mulmuladd2(i32 %a0, i32 %a1) {
; CHECK-LABEL: @mulmuladd2(
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[A0:%.*]], 16
; CHECK-NEXT: [[MUL1:%.*]] = mul i32 [[ADD]], [[A1:%.*]]
; CHECK-NEXT: [[MUL2:%.*]] = mul i32 [[MUL1]], -4
; CHECK-NEXT: ret i32 [[MUL2]]
;
%add = add i32 %a0, 16
%mul1 = mul i32 %add, %a1
%mul2 = mul i32 %mul1, -4
ret i32 %mul2
}
define i32 @mulmuladd2_extrause0(i32 %a0, i32 %a1) {
; CHECK-LABEL: @mulmuladd2_extrause0(
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[A0:%.*]], 16
; CHECK-NEXT: [[MUL1:%.*]] = mul i32 [[ADD]], [[A1:%.*]]
; CHECK-NEXT: call void @use32(i32 [[MUL1]])
; CHECK-NEXT: [[MUL2:%.*]] = mul i32 [[MUL1]], -4
; CHECK-NEXT: ret i32 [[MUL2]]
;
%add = add i32 %a0, 16
%mul1 = mul i32 %add, %a1
call void @use32(i32 %mul1)
%mul2 = mul i32 %mul1, -4
ret i32 %mul2
}
define i32 @mulmuladd2_extrause1(i32 %a0, i32 %a1) {
; CHECK-LABEL: @mulmuladd2_extrause1(
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[A0:%.*]], 16
; CHECK-NEXT: call void @use32(i32 [[ADD]])
; CHECK-NEXT: [[MUL1:%.*]] = mul i32 [[ADD]], [[A1:%.*]]
; CHECK-NEXT: [[MUL2:%.*]] = mul i32 [[MUL1]], -4
; CHECK-NEXT: ret i32 [[MUL2]]
;
%add = add i32 %a0, 16
call void @use32(i32 %add)
%mul1 = mul i32 %add, %a1
%mul2 = mul i32 %mul1, -4
ret i32 %mul2
}
define i32 @mulmuladd2_extrause2(i32 %a0, i32 %a1) {
; CHECK-LABEL: @mulmuladd2_extrause2(
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[A0:%.*]], 16
; CHECK-NEXT: call void @use32(i32 [[ADD]])
; CHECK-NEXT: [[MUL1:%.*]] = mul i32 [[ADD]], [[A1:%.*]]
; CHECK-NEXT: call void @use32(i32 [[MUL1]])
; CHECK-NEXT: [[MUL2:%.*]] = mul i32 [[MUL1]], -4
; CHECK-NEXT: ret i32 [[MUL2]]
;
%add = add i32 %a0, 16
call void @use32(i32 %add)
%mul1 = mul i32 %add, %a1
call void @use32(i32 %mul1)
%mul2 = mul i32 %mul1, -4
ret i32 %mul2
}
define i32 @mulnot(i32 %a0) {
; CHECK-LABEL: @mulnot(
; CHECK-NEXT: [[ADD:%.*]] = xor i32 [[A0:%.*]], -1
; CHECK-NEXT: [[MUL:%.*]] = mul i32 [[ADD]], -4
; CHECK-NEXT: ret i32 [[MUL]]
;
%add = xor i32 %a0, -1
%mul = mul i32 %add, -4
ret i32 %mul
}
define i32 @mulnot_extrause(i32 %a0) {
; CHECK-LABEL: @mulnot_extrause(
; CHECK-NEXT: [[NOT:%.*]] = xor i32 [[A0:%.*]], -1
; CHECK-NEXT: call void @use32(i32 [[NOT]])
; CHECK-NEXT: [[MUL:%.*]] = mul i32 [[NOT]], -4
; CHECK-NEXT: ret i32 [[MUL]]
;
%not = xor i32 %a0, -1
call void @use32(i32 %not)
%mul = mul i32 %not, -4
ret i32 %mul
}

13
llvm/test/Transforms/InstCombine/sub-of-negatible.ll
View File

@ -1113,6 +1113,19 @@ define i8 @negate_add_with_single_negatible_operand(i8 %x, i8 %y) {
%t1 = sub i8 0, %t0
ret i8 %t1
}
; do so even if we are two levels deep
define i8 @negate_add_with_single_negatible_operand_depth2(i8 %x, i8 %y) {
; CHECK-LABEL: @negate_add_with_single_negatible_operand_depth2(
; CHECK-NEXT: [[T0_NEG:%.*]] = sub i8 -21, [[X:%.*]]
; CHECK-NEXT: [[T1_NEG:%.*]] = mul i8 [[T0_NEG]], [[Y:%.*]]
; CHECK-NEXT: ret i8 [[T1_NEG]]
;
%t0 = add i8 %x, 21
%t1 = mul i8 %t0, %y
%t2 = sub i8 0, %t1
ret i8 %t2
}
define i8 @negate_add_with_single_negatible_operand_extrause(i8 %x, i8 %y) {
; CHECK-LABEL: @negate_add_with_single_negatible_operand_extrause(
; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], 42