When building riscv32-none-elf with "--enable-checking=yes,rtl", the
following ICE is observed:
cc1: internal compiler error: RTL check: expected code 'const_int', have
'const_double' in riscv_const_insns, at config/riscv/riscv.cc:1313
0x843c4d rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/rtl.cc:916
0x8eab61 riscv_const_insns(rtx_def*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/config/riscv/riscv.cc:1313
0x15443bb riscv_legitimate_constant_p
/mnt/nvme/dinux/local-workspace/gcc/gcc/config/riscv/riscv.cc:826
0xdd3c71 emit_move_insn(rtx_def*, rtx_def*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/expr.cc:4310
0x15f28e5 run_const_vector_selftests
/mnt/nvme/dinux/local-workspace/gcc/gcc/config/riscv/riscv-selftests.cc:285
0x15f37bd selftest::riscv_run_selftests()
/mnt/nvme/dinux/local-workspace/gcc/gcc/config/riscv/riscv-selftests.cc:364
0x1f6fba9 selftest::run_tests()
/mnt/nvme/dinux/local-workspace/gcc/gcc/selftest-run-tests.cc:111
0x11d1f39 toplev::run_self_tests()
/mnt/nvme/dinux/local-workspace/gcc/gcc/toplev.cc:2185
Fix by following the spirit of the adjacent comment, and using the
dedicated riscv_const_insns() function to calculate cost for loading a
constant element. Infinite recursion is not possible because the first
invocation is on a CONST_VECTOR, whereas the second is on a single
element of the vector (e.g. CONST_INT or CONST_DOUBLE).
Regression tested for riscv32-none-elf. No changes in gcc.sum and
g++.sum. I don't have setup to test riscv64.
gcc/ChangeLog:
* config/riscv/riscv.cc (riscv_const_insns): Recursively call
for constant element of a vector.
Signed-off-by: Dimitar Dimitrov <dimi...@dinux.eu>
---
gcc/config/riscv/riscv.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 3954c89a039..c15da1d0e30 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -1310,7 +1310,7 @@ riscv_const_insns (rtx x)
a general-purpose register. This means we need as many
insns as it takes to load the constant into the GPR
and one vmv.v.x. */
- return 1 + riscv_integer_cost (INTVAL (elt));
+ return 1 + riscv_const_insns (elt);
}
}
--
2.40.1
