GCC modified for the FreeChainXenon project
e40a3d8651
This patch would like to fix a ICE in mode sw for below example code.
during RTL pass: mode_sw
test.c: In function ‘vbool16_t j(vuint64m4_t)’:
test.c:15:1: internal compiler error: in create_pre_exit, at
mode-switching.cc:451
15 | }
| ^
0x3978f12 create_pre_exit
__RISCV_BUILD__/../gcc/mode-switching.cc:451
0x3979e9e optimize_mode_switching
__RISCV_BUILD__/../gcc/mode-switching.cc:849
0x397b9bc execute
__RISCV_BUILD__/../gcc/mode-switching.cc:1324
extern size_t get_vl ();
vbool16_t
test (vuint64m4_t a)
{
unsigned long b;
return __riscv_vmsne_vx_u64m4_b16 (a, b, get_vl ());
}
The create_pre_exit would like to find a return value copy. If
not, there will be a reason in assert but not available for above
sample code when vector calling convension is enabled by default.
This patch would like to override the TARGET_FUNCTION_VALUE_REGNO_P
for vector register and then we will have hard_regno_nregs for copy_num,
aka there is a return value copy.
As a side-effect of allow vector in TARGET_FUNCTION_VALUE_REGNO_P, the
TARGET_GET_RAW_RESULT_MODE will have vector mode and which is sizeless
cannot be converted to fixed_size_mode. Thus override the hook
TARGET_GET_RAW_RESULT_MODE and return VOIDmode when the regno is-not-a
fixed_size_mode.
The below tests are passed for this patch.
* The fully riscv regression tests.
* The reproducing test in bugzilla PR114639.
PR target/114639
gcc/ChangeLog:
* config/riscv/riscv.cc (riscv_function_value_regno_p): New func
impl for hook TARGET_FUNCTION_VALUE_REGNO_P.
(riscv_get_raw_result_mode): New func imple for hook
TARGET_GET_RAW_RESULT_MODE.
(TARGET_FUNCTION_VALUE_REGNO_P): Impl the hook.
(TARGET_GET_RAW_RESULT_MODE): Ditto.
* config/riscv/riscv.h (V_RETURN): New macro for vector return.
(GP_RETURN_FIRST): New macro for the first GPR in return.
(GP_RETURN_LAST): New macro for the last GPR in return.
(FP_RETURN_FIRST): Diito but for FPR.
(FP_RETURN_LAST): Ditto.
(FUNCTION_VALUE_REGNO_P): Remove as deprecated and replace by
TARGET_FUNCTION_VALUE_REGNO_P.
gcc/testsuite/ChangeLog:
* g++.target/riscv/rvv/base/pr114639-1.C: New test.
* gcc.target/riscv/rvv/base/pr114639-1.c: New test.
Signed-off-by: Pan Li <pan2.li@intel.com>
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