* [PATCH] riscv: Fix insn cost calculation
@ 2023-06-06 4:51 Dimitar Dimitrov
2023-06-07 2:40 ` Jeff Law
0 siblings, 1 reply; 2+ messages in thread
From: Dimitar Dimitrov @ 2023-06-06 4:51 UTC (permalink / raw)
To: gcc-patches; +Cc: Dimitar Dimitrov
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 <dimitar@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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] riscv: Fix insn cost calculation
2023-06-06 4:51 [PATCH] riscv: Fix insn cost calculation Dimitar Dimitrov
@ 2023-06-07 2:40 ` Jeff Law
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Law @ 2023-06-07 2:40 UTC (permalink / raw)
To: Dimitar Dimitrov, gcc-patches
On 6/5/23 22:51, Dimitar Dimitrov wrote:
> 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.
I think most folks are using QEMU to test. Though I think most are
doing it in a rv64 environment.
>
> gcc/ChangeLog:
>
> * config/riscv/riscv.cc (riscv_const_insns): Recursively call
> for constant element of a vector.
OK for the trunk. I don't think this code is in gcc-13, but also OK as
a backport if I'm wrong and it is in gcc-13.
jeff
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2023-06-07 2:40 ` Jeff Law
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