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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
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@ -253,7 +253,7 @@ public:
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///
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/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative.
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///
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bool isAssociative() const { return isAssociative(getOpcode()); }
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bool isAssociative() const;
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static bool isAssociative(unsigned op);
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/// isCommutative - Return true if the instruction is commutative:
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@ -468,6 +468,20 @@ bool Instruction::isAssociative(unsigned Opcode) {
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Opcode == Add || Opcode == Mul;
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}
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bool Instruction::isAssociative() const {
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unsigned Opcode = getOpcode();
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if (isAssociative(Opcode))
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return true;
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switch (Opcode) {
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case FMul:
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case FAdd:
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return cast<FPMathOperator>(this)->hasUnsafeAlgebra();
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default:
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return false;
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}
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}
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/// isCommutative - Return true if the instruction is commutative:
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///
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/// Commutative operators satisfy: (x op y) === (y op x)
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32
test/Transforms/InstCombine/fast-math.ll
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32
test/Transforms/InstCombine/fast-math.ll
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@ -0,0 +1,32 @@
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; testing-case "float fold(float a) { return 1.2f * a * 2.3f; }"
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; 1.2f and 2.3f is supposed to be fold.
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define float @fold(float %a) {
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fold:
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%mul = fmul fast float %a, 0x3FF3333340000000
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%mul1 = fmul fast float %mul, 0x4002666660000000
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ret float %mul1
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; CHECK: fold
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; CHECK: fmul float %a, 0x4006147AE0000000
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}
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; Same testing-case as the one used in fold() except that the operators have
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; fixed FP mode.
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define float @notfold(float %a) {
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notfold:
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; CHECK: notfold
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; CHECK: %mul = fmul fast float %a, 0x3FF3333340000000
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%mul = fmul fast float %a, 0x3FF3333340000000
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%mul1 = fmul float %mul, 0x4002666660000000
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ret float %mul1
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}
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define float @fold2(float %a) {
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notfold2:
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; CHECK: fold2
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; CHECK: fmul float %a, 0x4006147AE0000000
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%mul = fmul float %a, 0x3FF3333340000000
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%mul1 = fmul fast float %mul, 0x4002666660000000
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ret float %mul1
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}
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