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| author | Adam Nemet <anemet@caviumnetworks.com> | 2008-11-18 02:08:24 +0000 |
|---|---|---|
| committer | Adam Nemet <nemet@gcc.gnu.org> | 2008-11-18 02:08:24 +0000 |
| commit | a990abffbfc5ee94b38f986f266cd5c365c0c045 (patch) | |
| tree | 5a743df1e9e72a72b5cbac89bebae2c44dd3bd74 /gcc/expmed.c | |
| parent | da8f5862ce62b97b095d833ea31a82f3848f79fa (diff) | |
| download | gcc-a990abffbfc5ee94b38f986f266cd5c365c0c045.tar.gz | |
expmed.c (extract_bit_field_1): Also use a temporary and convert_extracted_bit_field when...
* expmed.c (extract_bit_field_1): Also use a temporary and
convert_extracted_bit_field when the conversion from ext_mode to
the target mode requires explicit truncation.
testsuite/
* gcc.c-torture/execute/20081117-1.c: New test.
From-SVN: r141960
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 0c7e611e188..70a0d18bcb5 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -1533,7 +1533,13 @@ extract_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize, if (GET_MODE (xtarget) != ext_mode) { - if (REG_P (xtarget)) + /* Don't use LHS paradoxical subreg if explicit truncation is needed + between the mode of the extraction (word_mode) and the target + mode. Instead, create a temporary and use convert_move to set + the target. */ + if (REG_P (xtarget) + && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (GET_MODE (xtarget)), + GET_MODE_BITSIZE (ext_mode))) { xtarget = gen_lowpart (ext_mode, xtarget); if (GET_MODE_SIZE (ext_mode) |