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Fold bitconv(bitconv(x)) -> x. We now compile this:
void foo(double); void bar(double X) { foo(X); } to this: bar: save -96, %o6, %o6 or %g0, %i0, %o0 or %g0, %i1, %o1 call foo nop restore %g0, %g0, %g0 retl nop instead of this: bar: save -112, %o6, %o6 st %i1, [%i6+-4] st %i0, [%i6+-8] ldd [%i6+-8], %f0 std %f0, [%i6+-16] ld [%i6+-12], %o1 ld [%i6+-16], %o0 call foo nop restore %g0, %g0, %g0 retl nop on V8. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24981 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1757,6 +1757,9 @@ SDOperand DAGCombiner::visitBIT_CONVERT(SDNode *N) {
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if (Res.Val != N) return Res;
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}
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if (N0.getOpcode() == ISD::BIT_CONVERT) // conv(conv(x,t1),t2) -> conv(x,t2)
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return DAG.getNode(ISD::BIT_CONVERT, VT, N0.getOperand(0));
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return SDOperand();
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}
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@ -916,6 +916,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
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assert(MVT::getSizeInBits(VT)==MVT::getSizeInBits(Operand.getValueType()) &&
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"Cannot BIT_CONVERT between two different types!");
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if (VT == Operand.getValueType()) return Operand; // noop conversion.
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if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
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return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0));
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break;
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case ISD::FNEG:
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if (OpOpcode == ISD::FSUB) // -(X-Y) -> (Y-X)
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