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| author | Richard Stallman <rms@gnu.org> | 1992-05-10 01:56:55 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1992-05-10 01:56:55 +0000 |
| commit | f1e60ec6d51d64b0a9d7683ba0bb8728f72aa6b8 (patch) | |
| tree | d28034accfc4bade6354b6324e6ad63ef09ff6cd /gcc/fold-const.c | |
| parent | 95d3562b5a4f0f6b30e36a99d4de2e15fd98637f (diff) | |
| download | gcc-f1e60ec6d51d64b0a9d7683ba0bb8728f72aa6b8.zip gcc-f1e60ec6d51d64b0a9d7683ba0bb8728f72aa6b8.tar.gz gcc-f1e60ec6d51d64b0a9d7683ba0bb8728f72aa6b8.tar.bz2 | |
*** empty log message ***
From-SVN: r951
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 2b39c11..75f5c18 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -2027,24 +2027,26 @@ optimize_bit_field_compare (code, compare_type, lhs, rhs) int lvolatilep = 0, rvolatilep = 0; tree linner, rinner; tree mask; + tree offset; /* Get all the information about the extractions being done. If the bit size if the same as the size of the underlying object, we aren't doing an extraction at all and so can do nothing. */ - linner = get_inner_reference (lhs, &lbitsize, &lbitpos, &lmode, + linner = get_inner_reference (lhs, &lbitsize, &lbitpos, &offset, &lmode, &lunsignedp, &lvolatilep); - if (lbitsize == GET_MODE_BITSIZE (lmode) || lbitsize < 0) + if (lbitsize == GET_MODE_BITSIZE (lmode) || lbitsize < 0 + || offset != 0) return 0; if (!const_p) { /* If this is not a constant, we can only do something if bit positions, sizes, and signedness are the same. */ - rinner = get_inner_reference (rhs, &rbitsize, &rbitpos, + rinner = get_inner_reference (rhs, &rbitsize, &rbitpos, &offset, &rmode, &runsignedp, &rvolatilep); if (lbitpos != rbitpos || lbitsize != rbitsize - || lunsignedp != runsignedp) + || lunsignedp != runsignedp || offset != 0) return 0; } @@ -2204,6 +2206,7 @@ decode_field_reference (exp, pbitsize, pbitpos, pmode, punsignedp, { tree mask = 0; tree inner; + tree offset; STRIP_NOPS (exp); @@ -2220,9 +2223,9 @@ decode_field_reference (exp, pbitsize, pbitpos, pmode, punsignedp, && TREE_CODE (exp) != BIT_FIELD_REF) return 0; - inner = get_inner_reference (exp, pbitsize, pbitpos, pmode, + inner = get_inner_reference (exp, pbitsize, pbitpos, &offset, pmode, punsignedp, pvolatilep); - if (*pbitsize < 0) + if (*pbitsize < 0 || offset != 0) return 0; if (mask == 0) |