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sched-deps.c (sched_analyze_1): On STACK_REGS targets...

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* sched-deps.c (sched_analyze_1): On STACK_REGS targets, x87, treat
	all writes to any stack register as a read/write dependency on
	FIRST_STACK_REG.
	(sched_analyze_2): Likewise, for reads from any stack register.

From-SVN: r98762
This commit is contained in:
Roger Sayle 2005-04-26 04:11:56 +00:00 committed by Roger Sayle
parent 21dad7e6b9
commit c3bdeea8f3
2 changed files with 26 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2005-04-25 Roger Sayle <roger@eyesopen.com>
* sched-deps.c (sched_analyze_1): On STACK_REGS targets, x87, treat
all writes to any stack register as a read/write dependency on
FIRST_STACK_REG.
(sched_analyze_2): Likewise, for reads from any stack register.
2005-04-25 Richard Henderson <rth@redhat.com>
* final.c (output_addr_const): Revert 2005-04-09 change.

19
gcc/sched-deps.c
View File

@ -534,6 +534,15 @@ sched_analyze_1 (struct deps *deps, rtx x, rtx insn)
{
regno = REGNO (dest);
#ifdef STACK_REGS
/* Treat all writes to a stack register as modifying the TOS. */
if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
{
SET_REGNO_REG_SET (reg_pending_uses, FIRST_STACK_REG);
regno = FIRST_STACK_REG;
}
#endif
/* A hard reg in a wide mode may really be multiple registers.
If so, mark all of them just like the first. */
if (regno < FIRST_PSEUDO_REGISTER)
@ -684,6 +693,16 @@ sched_analyze_2 (struct deps *deps, rtx x, rtx insn)
case REG:
{
int regno = REGNO (x);
#ifdef STACK_REGS
/* Treat all reads of a stack register as modifying the TOS. */
if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
{
SET_REGNO_REG_SET (reg_pending_sets, FIRST_STACK_REG);
regno = FIRST_STACK_REG;
}
#endif
if (regno < FIRST_PSEUDO_REGISTER)
{
int i = hard_regno_nregs[regno][GET_MODE (x)];