On Wed, May 2, 2018 at 3:05 PM, Jim Wilson wrote:>
> * config/riscv/riscv.c (riscv_extend_comparands): In unsigned QImode
> test, check for sign extended subreg and/or constant operands, and
> do a sign extend in that case.
>
> gcc/testsuite/
> * gcc.target/
In the RISC-V backend, there is code that does a zero-extend by default for
QImode compare arguments. This is because zero-extend is a single and insn,
whereas sign-extend is two shifts. However, if we have two values that are
already sign extended, or a sign extended value and a CONST_INT, then
