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Handle CALL_INSN_FUNCTION_USAGE clobbers in regcprop.c 

2015-01-09  Tom de Vries  <tom@codesourcery.com>

	PR rtl-optimization/64539
	* regcprop.c (kill_clobbered_values): Factor out of ...
	(copyprop_hardreg_forward_1): ... here.  Use kill_clobbered_values
	instead of note_stores with kill_clobbered_value.

From-SVN: r219400
This commit is contained in:
Tom de Vries 2015-01-09 18:54:20 +00:00 committed by Tom de Vries
parent a5dbcace37
commit 486b97f297
2 changed files with 29 additions and 12 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2015-01-09 Tom de Vries <tom@codesourcery.com>
PR rtl-optimization/64539
* regcprop.c (kill_clobbered_values): Factor out of ...
(copyprop_hardreg_forward_1): ... here. Use kill_clobbered_values
instead of note_stores with kill_clobbered_value.
2015-01-09 Andreas Tobler <andreast@gcc.gnu.org>
* ginclude/unwind-arm-common.h: Revert previous commit.

34
gcc/regcprop.c
View File

@ -734,6 +734,26 @@ cprop_find_used_regs (rtx *loc, void *data)
}
}
/* Apply clobbers of INSN in PATTERN and C_I_F_U to value_data VD. */
static void
kill_clobbered_values (rtx_insn *insn, struct value_data *vd)
{
note_stores (PATTERN (insn), kill_clobbered_value, vd);
if (CALL_P (insn))
{
rtx exp;
for (exp = CALL_INSN_FUNCTION_USAGE (insn); exp; exp = XEXP (exp, 1))
{
rtx x = XEXP (exp, 0);
if (GET_CODE (x) == CLOBBER)
kill_value (SET_DEST (x), vd);
}
}
}
/* Perform the forward copy propagation on basic block BB. */
static bool
@ -800,7 +820,7 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
/* Within asms, a clobber cannot overlap inputs or outputs.
I wouldn't think this were true for regular insns, but
scan_rtx treats them like that... */
note_stores (PATTERN (insn), kill_clobbered_value, vd);
kill_clobbered_values (insn, vd);
/* Kill all auto-incremented values. */
/* ??? REG_INC is useless, since stack pushes aren't done that way. */
@ -1035,17 +1055,7 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd)
but instead among CLOBBERs on the CALL_INSN, we could wrongly
assume the value in it is still live. */
if (ksvd.ignore_set_reg)
{
note_stores (PATTERN (insn), kill_clobbered_value, vd);
for (exp = CALL_INSN_FUNCTION_USAGE (insn);
exp;
exp = XEXP (exp, 1))
{
rtx x = XEXP (exp, 0);
if (GET_CODE (x) == CLOBBER)
kill_value (SET_DEST (x), vd);
}
}
kill_clobbered_values (insn, vd);
}
bool copy_p = (set