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i386: fix -march=amd crash

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It started with g:3e2ae3ee285a57455d5a23bd352a68c289130186 where
new entry was added to processor_alias_table after generic node:

+  {"amdfam19h", PROCESSOR_GENERIC, CPU_GENERIC, 0,
+    M_CPU_TYPE (AMDFAM19H), P_NONE},

and then the following is violated:

/* NB: processor_alias_table stops at the "generic" entry.  */

gcc/ChangeLog:

	PR target/99753
	* common/config/i386/i386-common.c (ARRAY_SIZE): Fix off-by-one
	error.
	* config/i386/i386-options.c (ix86_option_override_internal):
	Add run-time assert.

gcc/testsuite/ChangeLog:

	PR target/99753
	* gcc.target/i386/pr99753.c: New test.
This commit is contained in:
Martin Liska 2021-03-24 15:58:03 +01:00
parent f225c6b0c5
commit 4f00c4d40a
3 changed files with 9 additions and 1 deletions
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2
gcc/common/config/i386/i386-common.c
View File

@ -2051,7 +2051,7 @@ const pta processor_alias_table[] =
};
/* NB: processor_alias_table stops at the "generic" entry. */
unsigned int const pta_size = ARRAY_SIZE (processor_alias_table) - 6;
unsigned int const pta_size = ARRAY_SIZE (processor_alias_table) - 7;
unsigned int const num_arch_names = ARRAY_SIZE (processor_alias_table);
/* Provide valid option values for -march and -mtune options. */

3
gcc/config/i386/i386-options.c
View File

@ -2042,6 +2042,9 @@ ix86_option_override_internal (bool main_args_p,
sorry ("%i-bit mode not compiled in",
(opts->x_ix86_isa_flags & OPTION_MASK_ISA_64BIT) ? 64 : 32);
/* Last processor_alias_table must point to "generic" entry. */
gcc_checking_assert (strcmp (processor_alias_table[pta_size - 1].name,
"generic") == 0);
for (i = 0; i < pta_size; i++)
if (! strcmp (opts->x_ix86_arch_string, processor_alias_table[i].name))
{

5
gcc/testsuite/gcc.target/i386/pr99753.c Normal file
View File

@ -0,0 +1,5 @@
/* PR target/99753 */
/* { dg-do compile } */
/* { dg-options "-march=amd -m32" } */
/* { dg-error "bad value .'amd'. for '-march=' switch" "" { target *-*-* } 0 } */