[llvm] [ValueTracking] Compute known FPClass from dominating condition (PR #80941)

Yingwei Zheng via llvm-commits llvm-commits at lists.llvm.org
Tue Feb 6 22:21:38 PST 2024


https://github.com/dtcxzyw created https://github.com/llvm/llvm-project/pull/80941

This patch improves `computeKnownFPClass` by using context-sensitive information from `DomConditionCache`.

See also the comment https://github.com/llvm/llvm-project/pull/80740#discussion_r1479328484.

>From 044604cabc8883fd61508e1e3e91e6e99b0c7c2d Mon Sep 17 00:00:00 2001
From: Yingwei Zheng <dtcxzyw2333 at gmail.com>
Date: Wed, 7 Feb 2024 14:07:42 +0800
Subject: [PATCH 1/2] [ValueTracking] Add pre-commit tests. NFC.

---
 .../InstCombine/fpclass-from-dom-cond.ll      | 213 ++++++++++++++++++
 1 file changed, 213 insertions(+)
 create mode 100644 llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll

diff --git a/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll b/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll
new file mode 100644
index 0000000000000..e74ec2c3ec9eb
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll
@@ -0,0 +1,213 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -S -passes=instcombine < %s | FileCheck %s
+
+define i1 @test1(float %x) {
+; CHECK-LABEL: define i1 @test1(
+; CHECK-SAME: float [[X:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[COND:%.*]] = fcmp ueq float [[X]], 0.000000e+00
+; CHECK-NEXT:    br i1 [[COND]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    ret i1 false
+; CHECK:       if.else:
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 783)
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+entry:
+  %cond = fcmp ueq float %x, 0.000000e+00
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  ret i1 false
+
+if.else:
+  %ret = call i1 @llvm.is.fpclass.f32(float %x, i32 783)
+  ret i1 %ret
+}
+
+define i1 @test2(double %x) {
+; CHECK-LABEL: define i1 @test2(
+; CHECK-SAME: double [[X:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp olt double [[X]], 0x3EB0C6F7A0000000
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    ret i1 false
+; CHECK:       if.end:
+; CHECK-NEXT:    [[CMP_I:%.*]] = fcmp oeq double [[X]], 0.000000e+00
+; CHECK-NEXT:    ret i1 [[CMP_I]]
+;
+entry:
+  %cmp = fcmp olt double %x, 0x3EB0C6F7A0000000
+  br i1 %cmp, label %if.then, label %if.end
+if.then:
+  ret i1 false
+if.end:
+  %cmp.i = fcmp oeq double %x, 0.000000e+00
+  ret i1 %cmp.i
+}
+
+define i1 @test3(float %x) {
+; CHECK-LABEL: define i1 @test3(
+; CHECK-SAME: float [[X:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp ogt float [[X]], 3.000000e+00
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[ABS:%.*]] = call float @llvm.fabs.f32(float [[X]])
+; CHECK-NEXT:    [[RET:%.*]] = fcmp oeq float [[ABS]], 0x7FF0000000000000
+; CHECK-NEXT:    ret i1 [[RET]]
+; CHECK:       if.else:
+; CHECK-NEXT:    ret i1 false
+;
+entry:
+  %cmp = fcmp ogt float %x, 3.000000e+00
+  br i1 %cmp, label %if.then, label %if.else
+if.then:
+  %abs = call float @llvm.fabs.f32(float %x)
+  %ret = fcmp oeq float %abs, 0x7FF0000000000000
+  ret i1 %ret
+if.else:
+  ret i1 false
+}
+
+define float @test4(float %x) {
+; CHECK-LABEL: define float @test4(
+; CHECK-SAME: float [[X:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp olt float [[X]], 0x3EB0C6F7A0000000
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    ret float 1.000000e+00
+; CHECK:       if.end:
+; CHECK-NEXT:    [[CMP_I:%.*]] = fcmp oeq float [[X]], 0.000000e+00
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv float 1.000000e+00, [[X]]
+; CHECK-NEXT:    [[RET:%.*]] = select i1 [[CMP_I]], float 1.000000e+00, float [[DIV]]
+; CHECK-NEXT:    ret float [[RET]]
+;
+entry:
+  %cmp = fcmp olt float %x, 0x3EB0C6F7A0000000
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+  ret float 1.0
+
+if.end:
+  %cmp.i = fcmp oeq float %x, 0.000000e+00
+  %div = fdiv float 1.000000e+00, %x
+  %ret = select i1 %cmp.i, float 1.000000e+00, float %div
+  ret float %ret
+}
+
+define i1 @test5(double %x, i1 %cond) {
+; CHECK-LABEL: define i1 @test5(
+; CHECK-SAME: double [[X:%.*]], i1 [[COND:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[COND]], label [[IF:%.*]], label [[EXIT:%.*]]
+; CHECK:       if:
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp uno double [[X]], 0.000000e+00
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    ret i1 false
+; CHECK:       if.end:
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    [[Y:%.*]] = phi double [ -1.000000e+00, [[ENTRY:%.*]] ], [ [[X]], [[IF_END]] ]
+; CHECK-NEXT:    [[RET:%.*]] = tail call i1 @llvm.is.fpclass.f64(double [[Y]], i32 411)
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+entry:
+  br i1 %cond, label %if, label %exit
+if:
+  %cmp = fcmp uno double %x, 0.000000e+00
+  br i1 %cmp, label %if.then, label %if.end
+if.then:
+  ret i1 false
+if.end:
+  br label %exit
+exit:
+  %y = phi double [ -1.000000e+00, %entry ], [ %x, %if.end ]
+  %ret = tail call i1 @llvm.is.fpclass.f64(double %y, i32 411)
+  ret i1 %ret
+}
+
+define i1 @test6(double %x) {
+; CHECK-LABEL: define i1 @test6(
+; CHECK-SAME: double [[X:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = fcmp ogt double [[X]], 0.000000e+00
+; CHECK-NEXT:    br i1 [[CMP]], label [[LAND_RHS:%.*]], label [[LAND_END:%.*]]
+; CHECK:       land.rhs:
+; CHECK-NEXT:    [[ABS:%.*]] = tail call double @llvm.fabs.f64(double [[X]])
+; CHECK-NEXT:    [[AND_I:%.*]] = bitcast double [[ABS]] to i64
+; CHECK-NEXT:    [[CMP_I:%.*]] = icmp eq i64 [[AND_I]], 9218868437227405312
+; CHECK-NEXT:    br label [[LAND_END]]
+; CHECK:       land.end:
+; CHECK-NEXT:    [[RET:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[CMP_I]], [[LAND_RHS]] ]
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+entry:
+  %cmp = fcmp ogt double %x, 0.000000e+00
+  br i1 %cmp, label %land.rhs, label %land.end
+
+land.rhs:
+  %abs = tail call double @llvm.fabs.f64(double %x)
+  %and.i = bitcast double %abs to i64
+  %cmp.i = icmp eq i64 %and.i, 9218868437227405312
+  br label %land.end
+
+land.end:
+  %ret = phi i1 [ false, %entry ], [ %cmp.i, %land.rhs ]
+  ret i1 %ret
+}
+
+define i1 @test7(float %x) {
+; CHECK-LABEL: define i1 @test7(
+; CHECK-SAME: float [[X:%.*]]) {
+; CHECK-NEXT:    [[COND:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 345)
+; CHECK-NEXT:    br i1 [[COND]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[RET1:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 456)
+; CHECK-NEXT:    ret i1 [[RET1]]
+; CHECK:       if.else:
+; CHECK-NEXT:    [[RET2:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 456)
+; CHECK-NEXT:    ret i1 [[RET2]]
+;
+  %cond = call i1 @llvm.is.fpclass.f32(float %x, i32 345)
+  br i1 %cond, label %if.then, label %if.else
+if.then:
+  %ret1 = call i1 @llvm.is.fpclass.f32(float %x, i32 456)
+  ret i1 %ret1
+if.else:
+  %ret2 = call i1 @llvm.is.fpclass.f32(float %x, i32 456)
+  ret i1 %ret2
+}
+
+define i1 @test1_no_dominating(float %x, i1 %c) {
+; CHECK-LABEL: define i1 @test1_no_dominating(
+; CHECK-SAME: float [[X:%.*]], i1 [[C:%.*]]) {
+; CHECK-NEXT:  entry0:
+; CHECK-NEXT:    br i1 [[C]], label [[ENTRY:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       entry:
+; CHECK-NEXT:    [[COND:%.*]] = fcmp ueq float [[X]], 0.000000e+00
+; CHECK-NEXT:    br i1 [[COND]], label [[IF_THEN:%.*]], label [[IF_ELSE]]
+; CHECK:       if.then:
+; CHECK-NEXT:    ret i1 false
+; CHECK:       if.else:
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 783)
+; CHECK-NEXT:    ret i1 [[RET]]
+;
+entry0:
+  br i1 %c, label %entry, label %if.else
+
+entry:
+  %cond = fcmp ueq float %x, 0.000000e+00
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  ret i1 false
+
+if.else:
+  %ret = call i1 @llvm.is.fpclass.f32(float %x, i32 783)
+  ret i1 %ret
+}

>From b80a7db2d1b7b5266885b03892c95002de4a46f7 Mon Sep 17 00:00:00 2001
From: Yingwei Zheng <dtcxzyw2333 at gmail.com>
Date: Wed, 7 Feb 2024 14:09:58 +0800
Subject: [PATCH 2/2] [ValueTracking] Compute known FPClass from dominating
 condition

---
 llvm/lib/Analysis/DomConditionCache.cpp       |  5 +
 llvm/lib/Analysis/ValueTracking.cpp           | 94 +++++++++++++------
 .../InstCombine/fpclass-from-dom-cond.ll      | 21 ++---
 3 files changed, 80 insertions(+), 40 deletions(-)

diff --git a/llvm/lib/Analysis/DomConditionCache.cpp b/llvm/lib/Analysis/DomConditionCache.cpp
index c7f4cab415888..071d8301b554c 100644
--- a/llvm/lib/Analysis/DomConditionCache.cpp
+++ b/llvm/lib/Analysis/DomConditionCache.cpp
@@ -53,6 +53,11 @@ static void findAffectedValues(Value *Cond,
         AddAffected(X);
     }
   }
+  // Handle patterns that computeKnownFPClass() support.
+  if (match(Cond, m_FCmp(Pred, m_Value(A), m_Constant())))
+    AddAffected(A);
+  if (match(Cond, m_Intrinsic<Intrinsic::is_fpclass>(m_Value(A), m_Constant())))
+    AddAffected(A);
 }
 
 void DomConditionCache::registerBranch(BranchInst *BI) {
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 58db81f470130..9ce18631b05bb 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -4213,9 +4213,56 @@ llvm::fcmpImpliesClass(CmpInst::Predicate Pred, const Function &F, Value *LHS,
   return fcmpImpliesClass(Pred, F, LHS, *ConstRHS, LookThroughSrc);
 }
 
-static FPClassTest computeKnownFPClassFromAssumes(const Value *V,
-                                                  const SimplifyQuery &Q) {
-  FPClassTest KnownFromAssume = fcAllFlags;
+static void computeKnownFPClassFromCond(const Value *V, Value *Cond,
+                                        bool CondIsTrue,
+                                        const Instruction *CxtI,
+                                        KnownFPClass &KnownFromContext) {
+  CmpInst::Predicate Pred;
+  Value *LHS;
+  Value *RHS;
+  uint64_t ClassVal = 0;
+  // TODO: handle sign-bit check idiom
+  if (match(Cond, m_FCmp(Pred, m_Value(LHS), m_Value(RHS)))) {
+    const APFloat *CRHS;
+    if (match(RHS, m_APFloat(CRHS))) {
+      auto [CmpVal, MaskIfTrue, MaskIfFalse] = fcmpImpliesClass(
+          Pred, *CxtI->getParent()->getParent(), LHS, *CRHS, LHS != V);
+      if (CmpVal == V)
+        KnownFromContext.knownNot(~(CondIsTrue ? MaskIfTrue : MaskIfFalse));
+    }
+  } else if (match(Cond, m_Intrinsic<Intrinsic::is_fpclass>(
+                             m_Value(LHS), m_ConstantInt(ClassVal)))) {
+    FPClassTest Mask = static_cast<FPClassTest>(ClassVal);
+    KnownFromContext.knownNot(CondIsTrue ? ~Mask : Mask);
+  }
+}
+
+static KnownFPClass computeKnownFPClassFromContext(const Value *V,
+                                                   const SimplifyQuery &Q) {
+  KnownFPClass KnownFromContext;
+
+  if (!Q.CxtI)
+    return KnownFromContext;
+
+  if (Q.DC && Q.DT) {
+    // Handle dominating conditions.
+    for (BranchInst *BI : Q.DC->conditionsFor(V)) {
+      Value *Cond = BI->getCondition();
+
+      BasicBlockEdge Edge0(BI->getParent(), BI->getSuccessor(0));
+      if (Q.DT->dominates(Edge0, Q.CxtI->getParent()))
+        computeKnownFPClassFromCond(V, Cond, /*CondIsTrue=*/true, Q.CxtI,
+                                    KnownFromContext);
+
+      BasicBlockEdge Edge1(BI->getParent(), BI->getSuccessor(1));
+      if (Q.DT->dominates(Edge1, Q.CxtI->getParent()))
+        computeKnownFPClassFromCond(V, Cond, /*CondIsTrue=*/false, Q.CxtI,
+                                    KnownFromContext);
+    }
+  }
+
+  if (!Q.AC)
+    return KnownFromContext;
 
   // Try to restrict the floating-point classes based on information from
   // assumptions.
@@ -4233,25 +4280,11 @@ static FPClassTest computeKnownFPClassFromAssumes(const Value *V,
     if (!isValidAssumeForContext(I, Q.CxtI, Q.DT))
       continue;
 
-    CmpInst::Predicate Pred;
-    Value *LHS, *RHS;
-    uint64_t ClassVal = 0;
-    if (match(I->getArgOperand(0), m_FCmp(Pred, m_Value(LHS), m_Value(RHS)))) {
-      const APFloat *CRHS;
-      if (match(RHS, m_APFloat(CRHS))) {
-        auto [CmpVal, MaskIfTrue, MaskIfFalse] =
-            fcmpImpliesClass(Pred, *F, LHS, *CRHS, LHS != V);
-        if (CmpVal == V)
-          KnownFromAssume &= MaskIfTrue;
-      }
-    } else if (match(I->getArgOperand(0),
-                     m_Intrinsic<Intrinsic::is_fpclass>(
-                         m_Value(LHS), m_ConstantInt(ClassVal)))) {
-      KnownFromAssume &= static_cast<FPClassTest>(ClassVal);
-    }
+    computeKnownFPClassFromCond(V, I->getArgOperand(0), /*CondIsTrue=*/true,
+                                Q.CxtI, KnownFromContext);
   }
 
-  return KnownFromAssume;
+  return KnownFromContext;
 }
 
 void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
@@ -4359,10 +4392,8 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
       KnownNotFromFlags |= fcInf;
   }
 
-  if (Q.AC) {
-    FPClassTest AssumedClasses = computeKnownFPClassFromAssumes(V, Q);
-    KnownNotFromFlags |= ~AssumedClasses;
-  }
+  KnownFPClass AssumedClasses = computeKnownFPClassFromContext(V, Q);
+  KnownNotFromFlags |= ~AssumedClasses.KnownFPClasses;
 
   // We no longer need to find out about these bits from inputs if we can
   // assume this from flags/attributes.
@@ -4370,6 +4401,12 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
 
   auto ClearClassesFromFlags = make_scope_exit([=, &Known] {
     Known.knownNot(KnownNotFromFlags);
+    if (!Known.SignBit && AssumedClasses.SignBit) {
+      if (*AssumedClasses.SignBit)
+        Known.signBitMustBeOne();
+      else
+        Known.signBitMustBeZero();
+    }
   });
 
   if (!Op)
@@ -5271,7 +5308,8 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
 
       bool First = true;
 
-      for (Value *IncValue : P->incoming_values()) {
+      for (const Use &U : P->operands()) {
+        Value *IncValue = U.get();
         // Skip direct self references.
         if (IncValue == P)
           continue;
@@ -5280,8 +5318,10 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
         // Recurse, but cap the recursion to two levels, because we don't want
         // to waste time spinning around in loops. We need at least depth 2 to
         // detect known sign bits.
-        computeKnownFPClass(IncValue, DemandedElts, InterestedClasses, KnownSrc,
-                            PhiRecursionLimit, Q);
+        computeKnownFPClass(
+            IncValue, DemandedElts, InterestedClasses, KnownSrc,
+            PhiRecursionLimit,
+            Q.getWithInstruction(P->getIncomingBlock(U)->getTerminator()));
 
         if (First) {
           Known = KnownSrc;
diff --git a/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll b/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll
index e74ec2c3ec9eb..48c6e91057094 100644
--- a/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll
+++ b/llvm/test/Transforms/InstCombine/fpclass-from-dom-cond.ll
@@ -10,7 +10,7 @@ define i1 @test1(float %x) {
 ; CHECK:       if.then:
 ; CHECK-NEXT:    ret i1 false
 ; CHECK:       if.else:
-; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 783)
+; CHECK-NEXT:    [[RET:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 780)
 ; CHECK-NEXT:    ret i1 [[RET]]
 ;
 entry:
@@ -34,8 +34,7 @@ define i1 @test2(double %x) {
 ; CHECK:       if.then:
 ; CHECK-NEXT:    ret i1 false
 ; CHECK:       if.end:
-; CHECK-NEXT:    [[CMP_I:%.*]] = fcmp oeq double [[X]], 0.000000e+00
-; CHECK-NEXT:    ret i1 [[CMP_I]]
+; CHECK-NEXT:    ret i1 false
 ;
 entry:
   %cmp = fcmp olt double %x, 0x3EB0C6F7A0000000
@@ -54,8 +53,7 @@ define i1 @test3(float %x) {
 ; CHECK-NEXT:    [[CMP:%.*]] = fcmp ogt float [[X]], 3.000000e+00
 ; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
 ; CHECK:       if.then:
-; CHECK-NEXT:    [[ABS:%.*]] = call float @llvm.fabs.f32(float [[X]])
-; CHECK-NEXT:    [[RET:%.*]] = fcmp oeq float [[ABS]], 0x7FF0000000000000
+; CHECK-NEXT:    [[RET:%.*]] = fcmp oeq float [[X]], 0x7FF0000000000000
 ; CHECK-NEXT:    ret i1 [[RET]]
 ; CHECK:       if.else:
 ; CHECK-NEXT:    ret i1 false
@@ -80,10 +78,8 @@ define float @test4(float %x) {
 ; CHECK:       if.then:
 ; CHECK-NEXT:    ret float 1.000000e+00
 ; CHECK:       if.end:
-; CHECK-NEXT:    [[CMP_I:%.*]] = fcmp oeq float [[X]], 0.000000e+00
 ; CHECK-NEXT:    [[DIV:%.*]] = fdiv float 1.000000e+00, [[X]]
-; CHECK-NEXT:    [[RET:%.*]] = select i1 [[CMP_I]], float 1.000000e+00, float [[DIV]]
-; CHECK-NEXT:    ret float [[RET]]
+; CHECK-NEXT:    ret float [[DIV]]
 ;
 entry:
   %cmp = fcmp olt float %x, 0x3EB0C6F7A0000000
@@ -113,7 +109,7 @@ define i1 @test5(double %x, i1 %cond) {
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    [[Y:%.*]] = phi double [ -1.000000e+00, [[ENTRY:%.*]] ], [ [[X]], [[IF_END]] ]
-; CHECK-NEXT:    [[RET:%.*]] = tail call i1 @llvm.is.fpclass.f64(double [[Y]], i32 411)
+; CHECK-NEXT:    [[RET:%.*]] = tail call i1 @llvm.is.fpclass.f64(double [[Y]], i32 408)
 ; CHECK-NEXT:    ret i1 [[RET]]
 ;
 entry:
@@ -138,8 +134,7 @@ define i1 @test6(double %x) {
 ; CHECK-NEXT:    [[CMP:%.*]] = fcmp ogt double [[X]], 0.000000e+00
 ; CHECK-NEXT:    br i1 [[CMP]], label [[LAND_RHS:%.*]], label [[LAND_END:%.*]]
 ; CHECK:       land.rhs:
-; CHECK-NEXT:    [[ABS:%.*]] = tail call double @llvm.fabs.f64(double [[X]])
-; CHECK-NEXT:    [[AND_I:%.*]] = bitcast double [[ABS]] to i64
+; CHECK-NEXT:    [[AND_I:%.*]] = bitcast double [[X]] to i64
 ; CHECK-NEXT:    [[CMP_I:%.*]] = icmp eq i64 [[AND_I]], 9218868437227405312
 ; CHECK-NEXT:    br label [[LAND_END]]
 ; CHECK:       land.end:
@@ -167,10 +162,10 @@ define i1 @test7(float %x) {
 ; CHECK-NEXT:    [[COND:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 345)
 ; CHECK-NEXT:    br i1 [[COND]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
 ; CHECK:       if.then:
-; CHECK-NEXT:    [[RET1:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 456)
+; CHECK-NEXT:    [[RET1:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 328)
 ; CHECK-NEXT:    ret i1 [[RET1]]
 ; CHECK:       if.else:
-; CHECK-NEXT:    [[RET2:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 456)
+; CHECK-NEXT:    [[RET2:%.*]] = call i1 @llvm.is.fpclass.f32(float [[X]], i32 128)
 ; CHECK-NEXT:    ret i1 [[RET2]]
 ;
   %cond = call i1 @llvm.is.fpclass.f32(float %x, i32 345)



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