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| author | Andreas Krebbel <krebbel1@de.ibm.com> | 2006-04-25 12:11:25 +0000 |
|---|---|---|
| committer | Andreas Krebbel <krebbel@gcc.gnu.org> | 2006-04-25 12:11:25 +0000 |
| commit | 495db1a1155904059e4239dc124c85717245d761 (patch) | |
| tree | d52d7694a2925756c7a06010431f2e6f09f3fa68 /gcc/expmed.c | |
| parent | 6d75cd5f57c4d23cdbd5acf9da32daf5265c07af (diff) | |
| download | gcc-495db1a1155904059e4239dc124c85717245d761.zip gcc-495db1a1155904059e4239dc124c85717245d761.tar.gz gcc-495db1a1155904059e4239dc124c85717245d761.tar.bz2 | |
expmed.c (store_bit_field): Handle paradoxical subregs on big endian machines.
2006-04-25 Andreas Krebbel <krebbel1@de.ibm.com>
* expmed.c (store_bit_field): Handle paradoxical subregs on big endian
machines.
2006-04-25 Andreas Krebbel <krebbel1@de.ibm.com>
* gcc.dg/20060425-1.c: New testcase.
From-SVN: r113248
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index a4396c2..31b8241 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -363,7 +363,25 @@ store_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, meaningful at a much higher level; when structures are copied between memory and regs, the higher-numbered regs always get higher addresses. */ - bitnum += SUBREG_BYTE (op0) * BITS_PER_UNIT; + int inner_mode_size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0))); + int outer_mode_size = GET_MODE_SIZE (GET_MODE (op0)); + + byte_offset = 0; + + /* Paradoxical subregs need special handling on big endian machines. */ + if (SUBREG_BYTE (op0) == 0 && inner_mode_size < outer_mode_size) + { + int difference = inner_mode_size - outer_mode_size; + + if (WORDS_BIG_ENDIAN) + byte_offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD; + if (BYTES_BIG_ENDIAN) + byte_offset += difference % UNITS_PER_WORD; + } + else + byte_offset = SUBREG_BYTE (op0); + + bitnum += byte_offset * BITS_PER_UNIT; op0 = SUBREG_REG (op0); } |