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2dcd508332
Some instructions (G_LOAD, G_SELECT, G_UNMERGE_VALUES) check if their uses will define/use FPRs (using `onlyUsesFP` and `onlyDefinesFP`). The register bank of a use isn't necessarily known when an instruction asks for this. Teach `hasFPConstraints` to look at the instructions feeding into a G_PHI when its destination bank is unknown. If any of them are FPR, assume the entire G_PHI will also be assigned a FPR. Since a phi can have many inputs, and those inputs can in turn be phis, restrict the search depth to a very low number. Also improve the docs for `hasFPConstraints` and friends a little. This is a 0.3% code size improvement on CTMark/Bullet at -O3, and a 0.2% code size improvement at CTMark/pairlocalalign at -O3. Differential Revision: https://reviews.llvm.org/D88177 |
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