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re PR rtl-optimization/20291 (combine throws away clobbers before trying to split)

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PR rtl-optimization/20291
	* combine.c (try_combine): If splitting fails, re-try with
	original combined pattern, i.e. before clobber stripping.

From-SVN: r96476
This commit is contained in:
J"orn Rennecke 2005-03-15 12:39:01 +00:00 committed by Joern Rennecke
parent 6baba9bb58
commit 9b12dc4f93
2 changed files with 26 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-03-15 J"orn Rennecke <joern.rennecke@st.com>
PR rtl-optimization/20291
* combine.c (try_combine): If splitting fails, re-try with
original combined pattern, i.e. before clobber stripping.
2005-03-14 Eric Christopher <echristo@redhat.com>
* config/mips/mips.h (DWARF_CIE_DATA_ALIGNMENT): Change for

20
gcc/combine.c
View File

@ -1594,6 +1594,7 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
{
/* New patterns for I3 and I2, respectively. */
rtx newpat, newi2pat = 0;
rtvec newpat_vec_with_clobbers = 0;
int substed_i2 = 0, substed_i1 = 0;
/* Indicates need to preserve SET in I1 or I2 in I3 if it is not dead. */
int added_sets_1, added_sets_2;
@ -2154,6 +2155,18 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
/* Note which hard regs this insn has as inputs. */
mark_used_regs_combine (newpat);
/* If recog_for_combine fails, it strips existing clobbers. If we'll
consider splitting this pattern, we might need these clobbers. */
if (i1 && GET_CODE (newpat) == PARALLEL
&& GET_CODE (XVECEXP (newpat, 0, XVECLEN (newpat, 0) - 1)) == CLOBBER)
{
int len = XVECLEN (newpat, 0);
newpat_vec_with_clobbers = rtvec_alloc (len);
for (i = 0; i < len; i++)
RTVEC_ELT (newpat_vec_with_clobbers, i) = XVECEXP (newpat, 0, i);
}
/* Is the result of combination a valid instruction? */
insn_code_number = recog_for_combine (&newpat, i3, &new_i3_notes);
@ -2281,6 +2294,13 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
}
}
/* If recog_for_combine has discarded clobbers, try to use them
again for the split. */
if (m_split == 0 && newpat_vec_with_clobbers)
m_split
= split_insns (gen_rtx_PARALLEL (VOIDmode,
newpat_vec_with_clobbers), i3);
if (m_split && NEXT_INSN (m_split) == NULL_RTX)
{
m_split = PATTERN (m_split);