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| author | Jim Wilson <wilson@gcc.gnu.org> | 1993-07-28 10:12:33 -0700 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1993-07-28 10:12:33 -0700 |
| commit | 8498efd0821d30f473d873bd4378484f914d9be5 (patch) | |
| tree | 4ecd48a57a442512fc6daa2e334c103cf346da60 | |
| parent | 0eb61c19ed94cea01e7e8e0540a932f15acf7ac7 (diff) | |
| download | gcc-8498efd0821d30f473d873bd4378484f914d9be5.zip gcc-8498efd0821d30f473d873bd4378484f914d9be5.tar.gz gcc-8498efd0821d30f473d873bd4378484f914d9be5.tar.bz2 | |
(expand_call): For unaligned arguments on
BYTES_BIG_ENDIAN machines, correct bitfield offset calculations.
From-SVN: r5013
| -rw-r--r-- | gcc/calls.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/gcc/calls.c b/gcc/calls.c index f426263..d9ec9da 100644 --- a/gcc/calls.c +++ b/gcc/calls.c @@ -1623,6 +1623,7 @@ expand_call (exp, target, ignore) < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) { int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); + int big_endian_correction = 0; args[i].n_aligned_regs = args[i].partial ? args[i].partial @@ -1631,6 +1632,13 @@ expand_call (exp, target, ignore) args[i].aligned_regs = (rtx *) alloca (sizeof (rtx) * args[i].n_aligned_regs); + /* Structures smaller than a word are aligned to the least signifcant + byte (to the right). On a BYTES_BIG_ENDIAN machine, this means we + must skip the empty high order bytes when calculating the bit + offset. */ + if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD) + big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); + for (j = 0; j < args[i].n_aligned_regs; j++) { rtx reg = gen_reg_rtx (word_mode); @@ -1651,12 +1659,10 @@ expand_call (exp, target, ignore) bitpos < BITS_PER_WORD && bytes > 0; bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT) { - int xbitpos = (BYTES_BIG_ENDIAN - ? BITS_PER_WORD - bitpos - bitsize - : bitpos); + int xbitpos = bitpos + big_endian_correction; store_bit_field (reg, bitsize, xbitpos, word_mode, - extract_bit_field (word, bitsize, xbitpos, 1, + extract_bit_field (word, bitsize, bitpos, 1, NULL_RTX, word_mode, word_mode, bitsize / BITS_PER_UNIT, |