Re: [PATCH 2/2] RISC-V: Constant synthesis by shifting the lower half

[Jeff Law]

On 8/8/24 11:10 AM, Raphael Moreira Zinsly wrote:
Improve handling of constants where the high half can be constructed
by shifting the low half.

gcc/ChangeLog:
        * config/riscv/riscv.cc (riscv_build_integer): Detect constants
        were the higher half is a shift of the lower half.

gcc/testsuite/ChangeLog:
        * gcc.target/riscv/synthesis-12.c: New test.
Don't you need to check somewhere that the upper/lower halves are the 
same after an appropriate shift?   It looks like you just assume they are.


Jeff