https://gcc.gnu.org/g:229f4f040485c0c05cfb707b30c9b983ed1f95d3
commit r15-7944-g229f4f040485c0c05cfb707b30c9b983ed1f95d3
Author: Stefan Schulze Frielinghaus <stefa...@gcc.gnu.org>
Date: Tue Mar 11 08:59:15 2025 +0100
s390: Implement TARGET_INSN_COST [PR115835]
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.
Diff:
---
gcc/config/s390/s390.cc | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/gcc/config/s390/s390.cc b/gcc/config/s390/s390.cc
index 29aef501fdd2..2f516967e7b1 100644
--- a/gcc/config/s390/s390.cc
+++ b/gcc/config/s390/s390.cc
@@ -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
