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s390: Implement TARGET_INSN_COST [PR115835]

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Currently insn_cost() only considers the source part of a SET.
Implement TARGET_INSN_COST in order to also take the destination into
account.  This may make a difference in case of a MEM where the address
is a SYMBOL_REF.

Fixes testsuite/gcc.target/s390/section-anchors.c.

gcc/ChangeLog:

	PR target/115835
	* config/s390/s390.cc (s390_insn_cost): Implement.
	(TARGET_INSN_COST): Define.
This commit is contained in:
Stefan Schulze Frielinghaus 2025-03-11 08:59:15 +01:00
parent c39b0d4fae
commit 229f4f0404
1 changed files with 22 additions and 0 deletions
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22
gcc/config/s390/s390.cc
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@ -3900,6 +3900,26 @@ s390_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
return 2;
}
/* Implement TARGET_INSN_COST. */
static int
s390_insn_cost (rtx_insn *insn, bool speed)
{
/* For stores also consider the destination. Penalize if the address
contains a SYMBOL_REF since this has to be fixed up by reload. */
rtx pat = single_set (insn);
if (pat && MEM_P (SET_DEST (pat)))
{
rtx mem = SET_DEST (pat);
rtx addr = XEXP (mem, 0);
int penalty = contains_symbol_ref_p (addr) ? COSTS_N_INSNS (1) : 0;
int src_cost = set_src_cost (SET_SRC (pat), GET_MODE (mem), speed);
src_cost = src_cost > 0 ? src_cost : COSTS_N_INSNS (1);
return penalty + src_cost;
}
return pattern_cost (PATTERN (insn), speed);
}
/* Compute a (partial) cost for rtx X. Return true if the complete
cost has been computed, and false if subexpressions should be
scanned. In either case, *TOTAL contains the cost result. The
@ -18355,6 +18375,8 @@ s390_c_mode_for_floating_type (enum tree_index ti)
#undef TARGET_CANNOT_COPY_INSN_P
#define TARGET_CANNOT_COPY_INSN_P s390_cannot_copy_insn_p
#undef TARGET_INSN_COST
#define TARGET_INSN_COST s390_insn_cost
#undef TARGET_RTX_COSTS
#define TARGET_RTX_COSTS s390_rtx_costs
#undef TARGET_ADDRESS_COST