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arm, mve: Fix arm_mve_dlstp_check_dec_counter's use of single_pred

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Call 'single_pred_p' before 'single_pred' to verify it is safe to do so.

gcc/ChangeLog:

	* config/arm/arm.cc (arm_mve_dlstp_check_dec_counter): Call
	single_pred_p to verify it's safe to call single_pred.

gcc/testsuite/ChangeLog:

	* gcc.target/arm/mve/dlstp-loop-form.c: Add loop that triggered ICE.
This commit is contained in:
Andre Vieira 2024-11-20 09:23:50 +00:00
parent 95b5fd7316
commit 3ec0b7cd7c
2 changed files with 15 additions and 2 deletions
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5
gcc/config/arm/arm.cc
View File

@ -35379,9 +35379,10 @@ arm_mve_dlstp_check_dec_counter (loop *loop, rtx_insn* vctp_insn,
return NULL;
else if (REG_P (condconst))
{
basic_block pre_loop_bb = single_pred (loop_preheader_edge (loop)->src);
if (!pre_loop_bb)
basic_block preheader_b = loop_preheader_edge (loop)->src;
if (!single_pred_p (preheader_b))
return NULL;
basic_block pre_loop_bb = single_pred (preheader_b);
rtx initial_compare = NULL_RTX;
if (!(prev_nonnote_nondebug_insn_bb (BB_END (pre_loop_bb))

12
gcc/testsuite/gcc.target/arm/mve/dlstp-loop-form.c
View File

@ -25,3 +25,15 @@ void n() {
}
}
int a;
void g2() {
long b;
while (a) {
char *c;
for (long d = b; d > 0; d -= 4) {
mve_pred16_t e = vctp32q(d);
int32x4_t f;
vstrbq_p_s32(c, f, e);
}
}
}