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| author | Richard Sandiford <rdsandiford@googlemail.com> | 2009-10-22 22:30:12 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2009-10-22 22:30:12 +0000 |
| commit | bd7960b1e4ce9d64b2631d0b644eb8bf83845005 (patch) | |
| tree | 4f4554809ba030c1b41d267109a8f8706fa58231 /gcc/cselib.c | |
| parent | 2a31793e324e29c237dc9e46064280aa626374ad (diff) | |
| download | gcc-bd7960b1e4ce9d64b2631d0b644eb8bf83845005.zip gcc-bd7960b1e4ce9d64b2631d0b644eb8bf83845005.tar.gz gcc-bd7960b1e4ce9d64b2631d0b644eb8bf83845005.tar.bz2 | |
rtl.h (shallow_copy_rtvec): Declare.
gcc/
* rtl.h (shallow_copy_rtvec): Declare.
* rtl.c (shallow_copy_rtvec): New function.
* cselib.c (cselib_subst_to_values): Use it. Only modify an
rtx field if the subrtx has changed.
From-SVN: r153475
Diffstat (limited to 'gcc/cselib.c')
| -rw-r--r-- | gcc/cselib.c | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/gcc/cselib.c b/gcc/cselib.c index aa5f7b0..7065429 100644 --- a/gcc/cselib.c +++ b/gcc/cselib.c @@ -1422,30 +1422,31 @@ cselib_subst_to_values (rtx x) { rtx t = cselib_subst_to_values (XEXP (x, i)); - if (t != XEXP (x, i) && x == copy) - copy = shallow_copy_rtx (x); - - XEXP (copy, i) = t; + if (t != XEXP (x, i)) + { + if (x == copy) + copy = shallow_copy_rtx (x); + XEXP (copy, i) = t; + } } else if (fmt[i] == 'E') { - int j, k; + int j; for (j = 0; j < XVECLEN (x, i); j++) { rtx t = cselib_subst_to_values (XVECEXP (x, i, j)); - if (t != XVECEXP (x, i, j) && XVEC (x, i) == XVEC (copy, i)) + if (t != XVECEXP (x, i, j)) { - if (x == copy) - copy = shallow_copy_rtx (x); - - XVEC (copy, i) = rtvec_alloc (XVECLEN (x, i)); - for (k = 0; k < j; k++) - XVECEXP (copy, i, k) = XVECEXP (x, i, k); + if (XVEC (x, i) == XVEC (copy, i)) + { + if (x == copy) + copy = shallow_copy_rtx (x); + XVEC (copy, i) = shallow_copy_rtvec (XVEC (x, i)); + } + XVECEXP (copy, i, j) = t; } - - XVECEXP (copy, i, j) = t; } } } |