RISC-V: Support CALL for RVV floating-point dynamic rounding

In basic dynamic rounding mode, we simply ignore call instructions and
we would like to take care of call in this PATCH.

During the call, the frm may be updated or keep as is. Thus, we must
make sure at least 2 things.

1. The static frm before call should not pollute the frm value in call.
2. The updated frm value in call should be sticky after call completed.

We will perfrom some steps to make above happen.

1. Mark call instruction with new mode DYN_CALL.
2. Mark the instruction after CALL from NONE to DYN.
3. When emit for a DYN_CALL, we will restore the frm value.
4. When emit from a DYN_CALL, we will backup the frm value.

Let's take a flow for this.

           +-------------+
           | Entry (DYN) | <- frrm a5
           +-------------+
          /               \
    +-------+             +-----------+
    | VFADD |             | VFADD RTZ |  <- fsrmi 1(RTZ)
    +-------+             +-----------+
          |                    |
    +-------+             +-----------+
    | CALL  |             | CALL      |  <- fsrm a5
    +-------+             +-----------+
          |                       |
+-----------+                 +-------+
| SHIFT     | <- frrm a5      | VFADD |  <- frrm a5
+-----------+                 +-------+
          |                  /
+-----------+               /
| VFADD RUP | <- fsrm1 3(RUP)
+-----------+             /
           \             /
            +-----------------+
            | Exit (DYN_EXIT) | <- fsrm a5
            +-----------------+

When call is the last insn of one bb, we take care of it when needed
for each insn by inserting one frm backup (frrm) insn to the end of
the current bb.

Signed-off-by: Pan Li <pan2.li@intel.com>
Co-Authored-By: Juzhe-Zhong <juzhe.zhong@rivai.ai>

gcc/ChangeLog:

	* config/riscv/riscv.cc (DYNAMIC_FRM_RTL): New macro.
	(STATIC_FRM_P): Ditto.
	(struct mode_switching_info): New struct for mode switching.
	(struct machine_function): Add new field mode switching.
	(riscv_emit_frm_mode_set): Add DYN_CALL emit.
	(riscv_frm_adjust_mode_after_call): New function for call mode.
	(riscv_frm_emit_after_call_in_bb_end): New function for emit
	insn when call as the end of bb.
	(riscv_frm_mode_needed): New function for frm mode needed.
	(frm_unknown_dynamic_p): Remove call check.
	(riscv_mode_needed): Extrac function for frm.
	(riscv_frm_mode_after): Add DYN_CALL after.
	(riscv_mode_entry): Remove backup rtl initialization.
	* config/riscv/vector.md (frm_mode): Add dyn_call.
	(fsrmsi_restore_exit): Rename to _volatile.
	(fsrmsi_restore_volatile): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/float-point-frm-insert-7.c: Adjust
	test cases.
	* gcc.target/riscv/rvv/base/float-point-frm-run-1.c: Ditto.
	* gcc.target/riscv/rvv/base/float-point-frm-run-2.c: Ditto.
	* gcc.target/riscv/rvv/base/float-point-frm-run-3.c: Ditto.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-33.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-34.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-35.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-36.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-37.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-38.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-39.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-40.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-41.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-42.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-43.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-44.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-45.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-46.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-47.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-48.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-49.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-50.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-51.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-52.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-53.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-54.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-55.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-56.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-57.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-58.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-59.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-60.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-61.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-62.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-63.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-64.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-65.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-66.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-67.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-68.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-69.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-70.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-71.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-72.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-73.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-74.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-75.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-76.c: New test.
	* gcc.target/riscv/rvv/base/float-point-dynamic-frm-77.c: New test.
	* gcc.target/riscv/rvv/base/float-point-frm-run-4.c: New test.
	* gcc.target/riscv/rvv/base/float-point-frm-run-5.c: New test.
	* gcc.target/riscv/rvv/base/float-point-frm-run.h: New test.

0 files changed, 0 insertions, 0 deletions