diff options
| author | paolo <paolo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-02-02 10:44:28 +0000 |
|---|---|---|
| committer | paolo <paolo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-02-02 10:44:28 +0000 |
| commit | 2f3f2ddf986ad223386f8ea7f4108de38eb72c86 (patch) | |
| tree | 4d91485aa960e611410df76a5f8d37fa1dde04d2 /gcc/rtlanal.c | |
| parent | 4aab44e7672c3c5058453a0d7959c7a162a32da3 (diff) | |
| download | gcc-2f3f2ddf986ad223386f8ea7f4108de38eb72c86.tar.gz | |
2004-02-02 Paolo Bonzini <bonzini@gnu.org>
* rtlanal.c (reg_overlap_mentioned_p) [!ENABLE_CHECKING]:
Don't test CONSTANT_P (x).
(reg_overlap_mentioned_p): Merge check for STRICT_LOWPART,
ZERO_EXTRACT, SIGN_EXTRACT with the switch statement.
Fix misindentation.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@77105 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/rtlanal.c')
| -rw-r--r-- | gcc/rtlanal.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 856af2f3a78..3744a327f20 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -1520,18 +1520,22 @@ reg_overlap_mentioned_p (rtx x, rtx in) { unsigned int regno, endregno; - /* Overly conservative. */ - if (GET_CODE (x) == STRICT_LOW_PART - || GET_CODE (x) == ZERO_EXTRACT - || GET_CODE (x) == SIGN_EXTRACT) - x = XEXP (x, 0); - - /* If either argument is a constant, then modifying X can not affect IN. */ - if (CONSTANT_P (x) || CONSTANT_P (in)) + /* If either argument is a constant, then modifying X can not + affect IN. Here we look at IN, we can profitably combine + CONSTANT_P (x) with the switch statement below. */ + if (CONSTANT_P (in)) return 0; + recurse: switch (GET_CODE (x)) { + case STRICT_LOW_PART: + case ZERO_EXTRACT: + case SIGN_EXTRACT: + /* Overly conservative. */ + x = XEXP (x, 0); + goto recurse; + case SUBREG: regno = REGNO (SUBREG_REG (x)); if (regno < FIRST_PSEUDO_REGISTER) @@ -1574,15 +1578,18 @@ reg_overlap_mentioned_p (rtx x, rtx in) for (i = XVECLEN (x, 0) - 1; i >= 0; i--) if (XEXP (XVECEXP (x, 0, i), 0) != 0 && reg_overlap_mentioned_p (XEXP (XVECEXP (x, 0, i), 0), in)) - return 1; + return 1; return 0; } default: - break; - } +#ifdef ENABLE_CHECKING + if (!CONSTANT_P (x)) + abort (); +#endif - abort (); + return 0; + } } /* Return the last value to which REG was set prior to INSN. If we can't |