Instruction::isAssociative() returns true for fmul/fadd if they are tagged "unsafe" mode.
Approved by: Eli and Michael.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168848 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index 4208144..d93c1d7 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -468,6 +468,20 @@
Opcode == Add || Opcode == Mul;
}
+bool Instruction::isAssociative() const {
+ unsigned Opcode = getOpcode();
+ if (isAssociative(Opcode))
+ return true;
+
+ switch (Opcode) {
+ case FMul:
+ case FAdd:
+ return cast<FPMathOperator>(this)->hasUnsafeAlgebra();
+ default:
+ return false;
+ }
+}
+
/// isCommutative - Return true if the instruction is commutative:
///
/// Commutative operators satisfy: (x op y) === (y op x)