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i386.c (expand_movstr, [...]): Fix inline-all-stringops sequence.

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* i386.c  (expand_movstr, expand_clrstr): Fix inline-all-stringops
	sequence.

From-SVN: r53128
This commit is contained in:
Jan Hubicka 2002-05-03 22:56:42 +02:00 committed by Jan Hubicka
parent b548220837
commit 37ad04a5a4
2 changed files with 31 additions and 16 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Fri May 3 22:53:37 CEST 2002 Jan Hubicka <jh@suse.cz>
* i386.c (expand_movstr, expand_clrstr): Fix inline-all-stringops
sequence.
2002-05-03 Richard Henderson <rth@redhat.com>
PR opt/6534

42
gcc/config/i386/i386.c
View File

@ -9244,6 +9244,9 @@ ix86_expand_movstr (dst, src, count_exp, align_exp)
{
rtx countreg2;
rtx label = NULL;
int desired_alignment = (TARGET_PENTIUMPRO
&& (count == 0 || count >= (unsigned int) 260)
? 8 : UNITS_PER_WORD);
/* In case we don't know anything about the alignment, default to
library version, since it is usually equally fast and result in
@ -9273,10 +9276,7 @@ ix86_expand_movstr (dst, src, count_exp, align_exp)
This is quite costy. Maybe we can revisit this decision later or
add some customizability to this code. */
if (count == 0
&& align < (TARGET_PENTIUMPRO && (count == 0
|| count >= (unsigned int) 260)
? 8 : UNITS_PER_WORD))
if (count == 0 && align < desired_alignment)
{
label = gen_label_rtx ();
emit_cmp_and_jump_insns (countreg, GEN_INT (UNITS_PER_WORD - 1),
@ -9298,10 +9298,7 @@ ix86_expand_movstr (dst, src, count_exp, align_exp)
emit_label (label);
LABEL_NUSES (label) = 1;
}
if (align <= 4
&& ((TARGET_PENTIUMPRO && (count == 0
|| count >= (unsigned int) 260))
|| TARGET_64BIT))
if (align <= 4 && desired_alignment > 4)
{
rtx label = ix86_expand_aligntest (destreg, 4);
emit_insn (gen_strmovsi (destreg, srcreg));
@ -9310,6 +9307,12 @@ ix86_expand_movstr (dst, src, count_exp, align_exp)
LABEL_NUSES (label) = 1;
}
if (label && desired_alignment > 4 && !TARGET_64BIT)
{
emit_label (label);
LABEL_NUSES (label) = 1;
label = NULL_RTX;
}
if (!TARGET_SINGLE_STRINGOP)
emit_insn (gen_cld ());
if (TARGET_64BIT)
@ -9455,6 +9458,10 @@ ix86_expand_clrstr (src, count_exp, align_exp)
{
rtx countreg2;
rtx label = NULL;
/* Compute desired alignment of the string operation. */
int desired_alignment = (TARGET_PENTIUMPRO
&& (count == 0 || count >= (unsigned int) 260)
? 8 : UNITS_PER_WORD);
/* In case we don't know anything about the alignment, default to
library version, since it is usually equally fast and result in
@ -9469,13 +9476,10 @@ ix86_expand_clrstr (src, count_exp, align_exp)
countreg = copy_to_mode_reg (counter_mode, count_exp);
zeroreg = copy_to_mode_reg (Pmode, const0_rtx);
if (count == 0
&& align < (TARGET_PENTIUMPRO && (count == 0
|| count >= (unsigned int) 260)
? 8 : UNITS_PER_WORD))
if (count == 0 && align < desired_alignment)
{
label = gen_label_rtx ();
emit_cmp_and_jump_insns (countreg, GEN_INT (UNITS_PER_WORD - 1),
emit_cmp_and_jump_insns (countreg, GEN_INT (desired_alignment - 1),
LEU, 0, counter_mode, 1, label);
}
if (align <= 1)
@ -9496,8 +9500,7 @@ ix86_expand_clrstr (src, count_exp, align_exp)
emit_label (label);
LABEL_NUSES (label) = 1;
}
if (align <= 4 && TARGET_PENTIUMPRO && (count == 0
|| count >= (unsigned int) 260))
if (align <= 4 && desired_alignment > 4)
{
rtx label = ix86_expand_aligntest (destreg, 4);
emit_insn (gen_strsetsi (destreg, (TARGET_64BIT
@ -9508,6 +9511,13 @@ ix86_expand_clrstr (src, count_exp, align_exp)
LABEL_NUSES (label) = 1;
}
if (label && desired_alignment > 4 && !TARGET_64BIT)
{
emit_label (label);
LABEL_NUSES (label) = 1;
label = NULL_RTX;
}
if (!TARGET_SINGLE_STRINGOP)
emit_insn (gen_cld ());
if (TARGET_64BIT)
@ -9523,12 +9533,12 @@ ix86_expand_clrstr (src, count_exp, align_exp)
emit_insn (gen_rep_stossi (destreg, countreg2, zeroreg,
destreg, countreg2));
}
if (label)
{
emit_label (label);
LABEL_NUSES (label) = 1;
}
if (TARGET_64BIT && align > 4 && count != 0 && (count & 4))
emit_insn (gen_strsetsi (destreg,
gen_rtx_SUBREG (SImode, zeroreg, 0)));