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| author | Jeffrey A Law <law@cygnus.com> | 1998-07-08 01:58:58 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1998-07-07 19:58:58 -0600 |
| commit | b98b49ac727f969a64be0dcd20d5493cdd325ac8 (patch) | |
| tree | a9d248d08ea5c8ed84300784f2a81fc120b1d6e0 /gcc | |
| parent | 67a00b49d6b636472ade6a137e818bdc2c003f5f (diff) | |
| download | gcc-b98b49ac727f969a64be0dcd20d5493cdd325ac8.zip gcc-b98b49ac727f969a64be0dcd20d5493cdd325ac8.tar.gz gcc-b98b49ac727f969a64be0dcd20d5493cdd325ac8.tar.bz2 | |
rtlanal.c (reg_overlap_mentioned_p): Handle STRICT_LOW_PART.
* rtlanal.c (reg_overlap_mentioned_p): Handle STRICT_LOW_PART. If
either argument is CONSTANT_P, then return zero.
* reload.c (reg_overlap_mentioned_for_reload_p): Similarly.
From-SVN: r21005
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/reload.c | 11 | ||||
| -rw-r--r-- | gcc/rtlanal.c | 11 |
3 files changed, 20 insertions, 6 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9b3a8ef..ecce7d2 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,9 @@ Wed Jul 8 02:43:34 1998 Jeffrey A Law (law@cygnus.com) + * rtlanal.c (reg_overlap_mentioned_p): Handle STRICT_LOW_PART. If + either argument is CONSTANT_P, then return zero. + * reload.c (reg_overlap_mentioned_for_reload_p): Similarly. + * configure.in: Also look at $srcdir/gas/configure to find a gas version #. diff --git a/gcc/reload.c b/gcc/reload.c index 0520554..0b76bb7 100644 --- a/gcc/reload.c +++ b/gcc/reload.c @@ -5822,7 +5822,14 @@ reg_overlap_mentioned_for_reload_p (x, in) { int regno, endregno; - if (GET_CODE (x) == SUBREG) + /* Overly conservative. */ + if (GET_CODE (x) == STRICT_LOW_PART) + x = XEXP (x, 0); + + /* If either argument is a constant, then modifying X can not affect IN. */ + if (CONSTANT_P (x) || CONSTANT_P (in)) + return 0; + else if (GET_CODE (x) == SUBREG) { regno = REGNO (SUBREG_REG (x)); if (regno < FIRST_PSEUDO_REGISTER) @@ -5844,8 +5851,6 @@ reg_overlap_mentioned_for_reload_p (x, in) abort (); } } - else if (CONSTANT_P (x)) - return 0; else if (GET_CODE (x) == MEM) return refers_to_mem_for_reload_p (in); else if (GET_CODE (x) == SCRATCH || GET_CODE (x) == PC diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index b410553..8f42391 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -817,7 +817,14 @@ reg_overlap_mentioned_p (x, in) { int regno, endregno; - if (GET_CODE (x) == SUBREG) + /* Overly conservative. */ + if (GET_CODE (x) == STRICT_LOW_PART) + x = XEXP (x, 0); + + /* If either argument is a constant, then modifying X can not affect IN. */ + if (CONSTANT_P (x) || CONSTANT_P (in)) + return 0; + else if (GET_CODE (x) == SUBREG) { regno = REGNO (SUBREG_REG (x)); if (regno < FIRST_PSEUDO_REGISTER) @@ -825,8 +832,6 @@ reg_overlap_mentioned_p (x, in) } else if (GET_CODE (x) == REG) regno = REGNO (x); - else if (CONSTANT_P (x)) - return 0; else if (GET_CODE (x) == MEM) { char *fmt; |