975bb17e2f
In this patch we're looking at cases where we'd like to be able to use lui+slli, but can't because of the sign extending nature of lui on TARGET_64BIT. For example: 0x8001100000020UL. The trunk currently generates 4 instructions for that constant, when it can be done with 3 (lui+slli.uw+addi). When Zba is enabled, we can use lui+slli.uw as the slli.uw masks off the bits 32..63 before shifting, giving us the precise semantics we want. I strongly suspect we'll want to do the same for a set of constants with lui+add.uw, lui+shNadd.uw, so you'll see the beginnings of generalizing support for lui followed by a "uw" instruction. The new test just tests the set of cases that showed up while exploring a particular space of the constant synthesis problem. It's not meant to be exhaustive (failure to use shadd when profitable). gcc/ * config/riscv/riscv.cc (riscv_integer_op): Add field tracking if we want to use a "uw" instruction variant. (riscv_build_integer_1): Initialize the new field in various places. Use lui+slli.uw for some constants. (riscv_move_integer): Handle slli.uw. gcc/testsuite/ * gcc.target/riscv/synthesis-2.c: New test. |
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