Jay Foad 26e1ebd3ea [GlobalISel] Change ConstantFoldVectorBinop to return vector of APInt ...

Previously it built MIR for the results and returned a Register.

This avoids building constants for earlier elements of the vector if
later elements will fail to fold, and allows CSEMIRBuilder::buildInstr
to avoid unconditionally building a copy from the result.

Use a new helper function MachineIRBuilder::buildBuildVectorConstant
to build a G_BUILD_VECTOR of G_CONSTANTs.

Differential Revision: https://reviews.llvm.org/D117758

2022-05-13 09:33:07 +01:00

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