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[InstCombine] add tests to show pattern matching failures due to commutation
I was looking to fix a bug in getComplexity(), and these cases showed up as obvious failures. I'm not sure how to find these in general though. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281055 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel
parent
bb15e0c82d
commit
6128d7f073
@ -140,6 +140,23 @@ define i32 @test12(i32 %x, i32 %y) {
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ret i32 %and
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test12_commuted(i32 %x, i32 %y) {
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; CHECK-LABEL: @test12_commuted(
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; CHECK-NEXT: [[NEG:%.*]] = xor i32 %x, -1
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEG]], %y
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; CHECK-NEXT: [[OR:%.*]] = or i32 %y, %x
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[XOR]], [[OR]]
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; CHECK-NEXT: ret i32 [[AND]]
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;
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%neg = xor i32 %x, -1
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%xor = xor i32 %neg, %y
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%or = or i32 %y, %x
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%and = and i32 %xor, %or
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ret i32 %and
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}
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; ((x | y) ^ (x ^ y)) -> (x & y)
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define i32 @test13(i32 %x, i32 %y) {
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; CHECK-LABEL: @test13(
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@ -166,6 +183,25 @@ define i32 @test14(i32 %x, i32 %y) {
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ret i32 %xor
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test14_commuted(i32 %x, i32 %y) {
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; CHECK-LABEL: @test14_commuted(
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; CHECK-NEXT: [[NOTY:%.*]] = xor i32 %y, -1
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 %x, -1
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; CHECK-NEXT: [[OR1:%.*]] = or i32 [[NOTY]], %x
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; CHECK-NEXT: [[OR2:%.*]] = or i32 [[NOTX]], %y
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[OR1]], [[OR2]]
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; CHECK-NEXT: ret i32 [[XOR]]
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;
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%noty = xor i32 %y, -1
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%notx = xor i32 %x, -1
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%or1 = or i32 %noty, %x
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%or2 = or i32 %notx, %y
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%xor = xor i32 %or1, %or2
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ret i32 %xor
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}
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; ((x & ~y) ^ (~x & y)) -> x ^ y
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define i32 @test15(i32 %x, i32 %y) {
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; CHECK-LABEL: @test15(
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@ -180,6 +216,25 @@ define i32 @test15(i32 %x, i32 %y) {
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ret i32 %xor
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test15_commuted(i32 %x, i32 %y) {
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; CHECK-LABEL: @test15_commuted(
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; CHECK-NEXT: [[NOTY:%.*]] = xor i32 %y, -1
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; CHECK-NEXT: [[NOTX:%.*]] = xor i32 %x, -1
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; CHECK-NEXT: [[AND1:%.*]] = and i32 [[NOTY]], %x
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; CHECK-NEXT: [[AND2:%.*]] = and i32 [[NOTX]], %y
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[AND1]], [[AND2]]
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; CHECK-NEXT: ret i32 [[XOR]]
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;
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%noty = xor i32 %y, -1
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%notx = xor i32 %x, -1
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%and1 = and i32 %noty, %x
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%and2 = and i32 %notx, %y
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%xor = xor i32 %and1, %and2
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ret i32 %xor
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}
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define i32 @test16(i32 %a, i32 %b) {
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; CHECK-LABEL: @test16(
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 %a, 1
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@ -555,6 +555,8 @@ define i32 @test41(i32 %a, i32 %b) {
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ret i32 %or
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}
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; (~A ^ B) | (A & B) -> (~A ^ B)
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define i32 @test42(i32 %a, i32 %b) {
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; CHECK-LABEL: @test42(
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; CHECK-NEXT: [[TMP1:%.*]] = xor i32 %a, -1
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@ -568,6 +570,42 @@ define i32 @test42(i32 %a, i32 %b) {
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ret i32 %or
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test42_commuted_and(i32 %a, i32 %b) {
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; CHECK-LABEL: @test42_commuted_and(
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; CHECK-NEXT: [[NEGA:%.*]] = xor i32 %a, -1
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[NEGA]], %b
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; CHECK-NEXT: [[AND:%.*]] = and i32 %b, %a
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[XOR]], [[AND]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%nega = xor i32 %a, -1
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%xor = xor i32 %nega, %b
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%and = and i32 %b, %a
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%or = or i32 %xor, %and
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ret i32 %or
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test42_commuted_xor(i32 %a, i32 %b) {
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; CHECK-LABEL: @test42_commuted_xor(
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; CHECK-NEXT: [[NEGA:%.*]] = xor i32 %a, -1
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 %b, [[NEGA]]
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; CHECK-NEXT: [[AND:%.*]] = and i32 %a, %b
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[XOR]], [[AND]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%nega = xor i32 %a, -1
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%xor = xor i32 %b, %nega
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%and = and i32 %a, %b
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%or = or i32 %xor, %and
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ret i32 %or
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}
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; Commute operands of the 'or'.
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define i32 @test43(i32 %a, i32 %b) {
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; CHECK-LABEL: @test43(
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; CHECK-NEXT: [[OR:%.*]] = xor i32 %a, %b
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@ -580,6 +618,23 @@ define i32 @test43(i32 %a, i32 %b) {
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ret i32 %or
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test43_commuted_and(i32 %a, i32 %b) {
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; CHECK-LABEL: @test43_commuted_and(
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; CHECK-NEXT: [[NEG:%.*]] = xor i32 %b, -1
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[NEG]], %a
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 %a, %b
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[XOR]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%neg = xor i32 %b, -1
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%and = and i32 %neg, %a
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%xor = xor i32 %a, %b
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%or = or i32 %and, %xor
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ret i32 %or
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}
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define i32 @test44(i32 %a, i32 %b) {
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; CHECK-LABEL: @test44(
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; CHECK-NEXT: [[OR:%.*]] = xor i32 %a, %b
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@ -180,6 +180,27 @@ define i32 @test12(i32 %a, i32 %b) {
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ret i32 %xor
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test12commuted(i32 %a, i32 %b) {
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; CHECK-LABEL: @test12commuted(
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; CHECK-NEXT: [[NEGB:%.*]] = xor i32 %b, -1
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[NEGB]], %a
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; CHECK-NEXT: [[NEGA:%.*]] = xor i32 %a, -1
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[AND]], [[NEGA]]
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; CHECK-NEXT: ret i32 [[XOR]]
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;
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%negb = xor i32 %b, -1
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%and = and i32 %negb, %a
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%nega = xor i32 %a, -1
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%xor = xor i32 %and, %nega
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ret i32 %xor
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}
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; This is a test of canonicalization via operand complexity.
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; The final xor has a binary operator and a (fake) unary operator,
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; so binary (more complex) should come first.
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define i32 @test13(i32 %a, i32 %b) {
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 %a, %b
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@ -193,6 +214,23 @@ define i32 @test13(i32 %a, i32 %b) {
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ret i32 %xor
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}
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; FIXME: We miss the fold because the pattern matching is inadequate.
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define i32 @test13commuted(i32 %a, i32 %b) {
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; CHECK-LABEL: @test13commuted(
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; CHECK-NEXT: [[NEGA:%.*]] = xor i32 %a, -1
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; CHECK-NEXT: [[NEGB:%.*]] = xor i32 %b, -1
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[NEGB]], %a
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[AND]], [[NEGA]]
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; CHECK-NEXT: ret i32 [[XOR]]
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;
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%nega = xor i32 %a, -1
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%negb = xor i32 %b, -1
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%and = and i32 %negb, %a
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%xor = xor i32 %nega, %and
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ret i32 %xor
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}
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; (A ^ C) ^ (A | B) -> ((~A) & B) ^ C
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define i32 @test14(i32 %a, i32 %b, i32 %c) {
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; CHECK-LABEL: @test14(
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