* [committed] [PR99422] LRA: Skip modifiers when processing memory address.
@ 2021-03-08 14:29 Vladimir Makarov
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From: Vladimir Makarov @ 2021-03-08 14:29 UTC (permalink / raw)
To: gcc-patches
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The following patch solves
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99422
The patch was successfully bootstrapped and tested on ppc64le, x86-64
and arm64.
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commit 04b4828c6dd215385fde6964a5e13da8a01a78ba (HEAD -> master)
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Mon Mar 8 09:24:57 2021 -0500
[PR99422] LRA: Skip modifiers when processing memory address.
Function process_address_1 can wrongly look at constraint modifiers
instead of the 1st constraint itself. The patch solves the problem.
gcc/ChangeLog:
PR target/99422
* lra-constraints.c (skip_contraint_modifiers): New function.
(process_address_1): Use it before lookup_constraint call.
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index 9253690561a..76e3ff7efe6 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -3392,6 +3392,21 @@ equiv_address_substitution (struct address_info *ad)
return change_p;
}
+/* Skip all modifiers and whitespaces in constraint STR and return the
+ result. */
+static const char *
+skip_contraint_modifiers (const char *str)
+{
+ for (;;str++)
+ switch (*str)
+ {
+ case '+' : case '&' : case '=': case '*': case ' ': case '\t':
+ case '$': case '^' : case '%': case '?': case '!':
+ break;
+ default: return str;
+ }
+}
+
/* Major function to make reloads for an address in operand NOP or
check its correctness (If CHECK_ONLY_P is true). The supported
cases are:
@@ -3426,8 +3441,8 @@ process_address_1 (int nop, bool check_only_p,
HOST_WIDE_INT scale;
rtx op = *curr_id->operand_loc[nop];
rtx mem = extract_mem_from_operand (op);
- const char *constraint = curr_static_id->operand[nop].constraint;
- enum constraint_num cn = lookup_constraint (constraint);
+ const char *constraint;
+ enum constraint_num cn;
bool change_p = false;
if (MEM_P (mem)
@@ -3435,6 +3450,9 @@ process_address_1 (int nop, bool check_only_p,
&& GET_CODE (XEXP (mem, 0)) == SCRATCH)
return false;
+ constraint
+ = skip_contraint_modifiers (curr_static_id->operand[nop].constraint);
+ cn = lookup_constraint (constraint);
if (insn_extra_address_constraint (cn)
/* When we find an asm operand with an address constraint that
doesn't satisfy address_operand to begin with, we clear
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