[RISC-V][PR target/121160] Avoid bogus force_reg call

When we canonicalize the comparison for a czero sequence we need to handle both
integer and fp comparisons.  Furthermore, within the integer space we want to
make sure we promote any sub-word objects to a full word.

All that is working fine.  After promotion we then force the value into a
register if it is not a register or constant already.   The idea is not to have
to special case subregs in subsequent code.  This works fine except when we're
presented with a floating point object that would be a subword.  (subreg:SF
(reg:SI)) on rv64 for example.

So this tightens up that force_reg step.   Bootstapped and regression tested on
riscv64-linux-gnu and tested on  riscv32-elf and riscv64-elf.

Pushing to the trunk after pre-commit verifies no regressions.

Jeff

	PR target/121160
gcc/
	* config/riscv/riscv.cc (canonicalize_comparands); Tighten check for
	forcing value into a GPR.

gcc/testsuite/
	* gcc.target/riscv/pr121160.c: New test.

0 files changed, 0 insertions, 0 deletions