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caller-save.c: (this_insn_sets): Move into: (save_call_clobbered_regs).

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2005-11-24  J"orn Rennecke <joern.rennecke@st.com>

	* caller-save.c: (this_insn_sets): Move into:
	(save_call_clobbered_regs).
	(mark_set_regs): Get this_insn_sets from data.

	(save_call_clobbered_regs): Take sets of the return value by
	sibcalls into account.

From-SVN: r107469
This commit is contained in:
J"orn Rennecke 2005-11-24 19:08:20 +00:00 committed by Joern Rennecke
parent 8a99f6f92f
commit e30edd6c0f
2 changed files with 24 additions and 9 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2005-11-24 J"orn Rennecke <joern.rennecke@st.com>
* caller-save.c: (this_insn_sets): Move into:
(save_call_clobbered_regs).
(mark_set_regs): Get this_insn_sets from data.
(save_call_clobbered_regs): Take sets of the return value by
sibcalls into account.
2005-11-24 J"orn Rennecke <joern.rennecke@st.com>
PR target/21623:

24
gcc/caller-save.c
View File

@ -83,10 +83,6 @@ static int n_regs_saved;
insn. */
static HARD_REG_SET referenced_regs;
/* Computed in mark_set_regs, holds all registers set by the current
instruction. */
static HARD_REG_SET this_insn_sets;
static void mark_set_regs (rtx, rtx, void *);
static void mark_referenced_regs (rtx);
@ -370,6 +366,10 @@ save_call_clobbered_regs (void)
struct insn_chain *chain, *next;
enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
/* Computed in mark_set_regs, holds all registers set by the current
instruction. */
HARD_REG_SET this_insn_sets;
CLEAR_HARD_REG_SET (hard_regs_saved);
n_regs_saved = 0;
@ -448,7 +448,12 @@ save_call_clobbered_regs (void)
multi-hard-reg pseudo; then the pseudo is considered live
during the call, but the subreg that is set isn't. */
CLEAR_HARD_REG_SET (this_insn_sets);
note_stores (PATTERN (insn), mark_set_regs, NULL);
note_stores (PATTERN (insn), mark_set_regs, &this_insn_sets);
/* Sibcalls are considered to set the return value,
compare flow.c:propagate_one_insn. */
if (SIBLING_CALL_P (insn) && current_function_return_rtx)
mark_set_regs (current_function_return_rtx, NULL_RTX,
&this_insn_sets);
/* Compute which hard regs must be saved before this call. */
AND_COMPL_HARD_REG_SET (hard_regs_to_save, call_fixed_reg_set);
@ -484,16 +489,17 @@ save_call_clobbered_regs (void)
}
}
/* Here from note_stores when an insn stores a value in a register.
/* Here from note_stores, or directly from save_call_clobbered_regs, when
an insn stores a value in a register.
Set the proper bit or bits in this_insn_sets. All pseudos that have
been assigned hard regs have had their register number changed already,
so we can ignore pseudos. */
static void
mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED)
mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *data)
{
int regno, endregno, i;
enum machine_mode mode = GET_MODE (reg);
HARD_REG_SET *this_insn_sets = data;
if (GET_CODE (reg) == SUBREG)
{
@ -511,7 +517,7 @@ mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED,
endregno = regno + hard_regno_nregs[regno][mode];
for (i = regno; i < endregno; i++)
SET_HARD_REG_BIT (this_insn_sets, i);
SET_HARD_REG_BIT (*this_insn_sets, i);
}
/* Here from note_stores when an insn stores a value in a register.