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Don't extract memory from operand for normal memory constraint.

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gcc/ChangeLog
	PR target/97540
	* ira.c: (ira_setup_alts): Extract memory from operand only
	for special memory constraint.
	* recog.c (asm_operand_ok): Ditto.
	* lra-constraints.c (process_alt_operands): MEM_P is
	required for normal memory constraint.

gcc/testsuite/ChangeLog
	* gcc.target/i386/pr97540.c: New test.
This commit is contained in:
liuhongt 2020-10-26 20:46:42 +08:00
parent db8b3e148d
commit 2e0aa43fc6
4 changed files with 20 additions and 4 deletions
gcc
ira.clra-constraints.crecog.c
testsuite/gcc.target/i386
pr97540.c

7
gcc/ira.c

@ -1845,6 +1845,7 @@ ira_setup_alts (rtx_insn *insn)
default:
{
enum constraint_num cn = lookup_constraint (p);
rtx mem = NULL;
switch (get_constraint_type (cn))
{
case CT_REGISTER:
@ -1867,8 +1868,12 @@ ira_setup_alts (rtx_insn *insn)
goto op_success;
case CT_MEMORY:
mem = op;
/* Fall through. */
case CT_SPECIAL_MEMORY:
if (MEM_P (extract_mem_from_operand (op)))
if (!mem)
mem = extract_mem_from_operand (op);
if (MEM_P (mem))
goto op_success;
win_p = true;
break;

3
gcc/lra-constraints.c

@ -2428,7 +2428,8 @@ process_alt_operands (int only_alternative)
break;
case CT_MEMORY:
if (satisfies_memory_constraint_p (op, cn))
if (MEM_P (op)
&& satisfies_memory_constraint_p (op, cn))
win = true;
else if (spilled_pseudo_p (op))
win = true;

8
gcc/recog.c

@ -1794,6 +1794,7 @@ asm_operand_ok (rtx op, const char *constraint, const char **constraints)
/* FALLTHRU */
default:
cn = lookup_constraint (constraint);
rtx mem = NULL;
switch (get_constraint_type (cn))
{
case CT_REGISTER:
@ -1812,10 +1813,13 @@ asm_operand_ok (rtx op, const char *constraint, const char **constraints)
break;
case CT_MEMORY:
mem = op;
/* Fall through. */
case CT_SPECIAL_MEMORY:
/* Every memory operand can be reloaded to fit. */
result = result || memory_operand (extract_mem_from_operand (op),
VOIDmode);
if (!mem)
mem = extract_mem_from_operand (op);
result = result || memory_operand (mem, VOIDmode);
break;
case CT_ADDRESS:

6
gcc/testsuite/gcc.target/i386/pr97540.c Normal file

@ -0,0 +1,6 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
int mt7615_add_interface_dev_0;
int ffs(int x) { asm("" : : "rm"(x)); }
int mt7615_add_interface() { ffs(~mt7615_add_interface_dev_0); }