[InstCombine] matchThreeWayIntCompare(): commutativity awareness

Summary:
`matchThreeWayIntCompare()` looks for
```
   select i1 (a == b),
          i32 Equal,
          i32 (select i1 (a < b), i32 Less, i32 Greater)
```
but both of these selects/compares can be in it's commuted form,
so out of 8 variants, only the two most basic ones is handled.
This fixes regression being introduced in D66232.

Reviewers: spatel, nikic, efriedma, xbolva00

Reviewed By: spatel

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66607

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369841 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/InstCombine/InstCombineCompares.cpp

@@ -2562,20 +2562,49 @@ bool InstCombiner::matchThreeWayIntCompare(SelectInst *SI, Value *&LHS,
   // TODO: Generalize this to work with other comparison idioms or ensure
   // they get canonicalized into this form.
 
-  // select i1 (a == b), i32 Equal, i32 (select i1 (a < b), i32 Less, i32
-  // Greater), where Equal, Less and Greater are placeholders for any three
-  // constants.
-  ICmpInst::Predicate PredA, PredB;
-  if (match(SI->getTrueValue(), m_ConstantInt(Equal)) &&
-      match(SI->getCondition(), m_ICmp(PredA, m_Value(LHS), m_Value(RHS))) &&
-      PredA == ICmpInst::ICMP_EQ &&
-      match(SI->getFalseValue(),
-            m_Select(m_ICmp(PredB, m_Specific(LHS), m_Specific(RHS)),
-                     m_ConstantInt(Less), m_ConstantInt(Greater))) &&
-      PredB == ICmpInst::ICMP_SLT) {
-    return true;
+  // select i1 (a == b),
+  //        i32 Equal,
+  //        i32 (select i1 (a < b), i32 Less, i32 Greater)
+  // where Equal, Less and Greater are placeholders for any three constants.
+  ICmpInst::Predicate PredA;
+  if (!match(SI->getCondition(), m_ICmp(PredA, m_Value(LHS), m_Value(RHS))) ||
+      !ICmpInst::isEquality(PredA))
+    return false;
+  Value *EqualVal = SI->getTrueValue();
+  Value *UnequalVal = SI->getFalseValue();
+  // We still can get non-canonical predicate here, so canonicalize.
+  if (PredA == ICmpInst::ICMP_NE)
+    std::swap(EqualVal, UnequalVal);
+  if (!match(EqualVal, m_ConstantInt(Equal)))
+    return false;
+  ICmpInst::Predicate PredB;
+  Value *LHS2, *RHS2;
+  if (!match(UnequalVal, m_Select(m_ICmp(PredB, m_Value(LHS2), m_Value(RHS2)),
+                                  m_ConstantInt(Less), m_ConstantInt(Greater))))
+    return false;
+  // We can get predicate mismatch here, so canonicalize if possible:
+  // First, ensure that 'LHS' match.
+  if (LHS2 != LHS) {
+    // x sgt y <--> y slt x
+    std::swap(LHS2, RHS2);
+    PredB = ICmpInst::getSwappedPredicate(PredB);
+  }
+  if (LHS2 != LHS)
+    return false;
+  // We also need to canonicalize 'RHS'.
+  if (PredB == ICmpInst::ICMP_SGT && isa<Constant>(RHS2)) {
+    // x sgt C-1  <-->  x sge C  <-->  not(x slt C)
+    auto FlippedStrictness =
+        getFlippedStrictnessPredicateAndConstant(PredB, cast<Constant>(RHS2));
+    if (!FlippedStrictness)
+      return false;
+    assert(FlippedStrictness->first == ICmpInst::ICMP_SGE && "Sanity check");
+    RHS2 = FlippedStrictness->second;
+    // And kind-of perform the result swap.
+    std::swap(Less, Greater);
+    PredB = ICmpInst::ICMP_SLT;
   }
-  return false;
+  return PredB == ICmpInst::ICMP_SLT && RHS == RHS2;
 }
 
 Instruction *InstCombiner::foldICmpSelectConstant(ICmpInst &Cmp,

test/Transforms/InstCombine/unrecognized_three-way-comparison.ll

@@ -36,14 +36,10 @@ exit:
 define i32 @compare_against_zero(i32 %x) {
 ; CHECK-LABEL: @compare_against_zero(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[X:%.*]], 0
-; CHECK-NEXT:    [[CMP2_INV:%.*]] = icmp sgt i32 [[X]], -1
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2_INV]], i32 1, i32 -1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 0, i32 [[SELECT1]]
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X:%.*]], 0
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 42
@@ -96,14 +92,10 @@ exit:
 define i32 @compare_against_two(i32 %x) {
 ; CHECK-LABEL: @compare_against_two(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[X:%.*]], 2
-; CHECK-NEXT:    [[CMP2_INV:%.*]] = icmp sgt i32 [[X]], 1
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2_INV]], i32 1, i32 -1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 0, i32 [[SELECT1]]
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X:%.*]], 2
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 42
@@ -497,13 +489,10 @@ define i32 @compare_against_fortytwo_commutatibility_1(i32 %x) {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[X:%.*]], 42
 ; CHECK-NEXT:    call void @use1(i1 [[CMP1]])
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp slt i32 [[X]], 42
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2]], i32 -1, i32 1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 [[SELECT1]], i32 0
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X]], 42
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 84
@@ -527,14 +516,10 @@ exit:
 define i32 @compare_against_fortytwo_commutatibility_2(i32 %x) {
 ; CHECK-LABEL: @compare_against_fortytwo_commutatibility_2(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[X:%.*]], 42
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i32 [[X]], 41
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2]], i32 1, i32 -1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 0, i32 [[SELECT1]]
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X:%.*]], 42
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 84
@@ -559,13 +544,10 @@ define i32 @compare_against_fortytwo_commutatibility_3(i32 %x) {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[X:%.*]], 42
 ; CHECK-NEXT:    call void @use1(i1 [[CMP1]])
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i32 [[X]], 41
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2]], i32 1, i32 -1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 [[SELECT1]], i32 0
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X]], 42
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 84
@@ -616,14 +598,10 @@ exit:
 define i32 @compare_against_arbitrary_value_commutativity1(i32 %x, i32 %c) {
 ; CHECK-LABEL: @compare_against_arbitrary_value_commutativity1(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[X:%.*]], [[C:%.*]]
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i32 [[C]], [[X]]
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2]], i32 -1, i32 1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 0, i32 [[SELECT1]]
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X:%.*]], [[C:%.*]]
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 42
@@ -648,13 +626,10 @@ define i32 @compare_against_arbitrary_value_commutativity2(i32 %x, i32 %c) {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[X:%.*]], [[C:%.*]]
 ; CHECK-NEXT:    call void @use1(i1 [[CMP1]])
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp slt i32 [[X]], [[C]]
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2]], i32 -1, i32 1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 [[SELECT1]], i32 0
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X]], [[C]]
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 42
@@ -680,13 +655,10 @@ define i32 @compare_against_arbitrary_value_commutativity3(i32 %x, i32 %c) {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[X:%.*]], [[C:%.*]]
 ; CHECK-NEXT:    call void @use1(i1 [[CMP1]])
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i32 [[C]], [[X]]
-; CHECK-NEXT:    [[SELECT1:%.*]] = select i1 [[CMP2]], i32 -1, i32 1
-; CHECK-NEXT:    [[SELECT2:%.*]] = select i1 [[CMP1]], i32 [[SELECT1]], i32 0
-; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SELECT2]], 0
-; CHECK-NEXT:    br i1 [[COND]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[X]], [[C]]
+; CHECK-NEXT:    br i1 [[TMP0]], label [[CALLFOO:%.*]], label [[EXIT:%.*]]
 ; CHECK:       callfoo:
-; CHECK-NEXT:    call void @foo(i32 [[SELECT2]])
+; CHECK-NEXT:    call void @foo(i32 1)
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret i32 42