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| author | Jakub Jelinek <jakub@redhat.com> | 2008-09-11 09:33:23 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2008-09-11 09:33:23 +0200 |
| commit | d898d29bf9d642a49bb2502416ecdfe0a21d6ac1 (patch) | |
| tree | 654aa05676a650f4bfb708a7c200e82d0a1e39c8 /gcc/expmed.c | |
| parent | ace428e3133f0aa7f4cb90180e716114bf73d705 (diff) | |
| download | gcc-d898d29bf9d642a49bb2502416ecdfe0a21d6ac1.zip gcc-d898d29bf9d642a49bb2502416ecdfe0a21d6ac1.tar.gz gcc-d898d29bf9d642a49bb2502416ecdfe0a21d6ac1.tar.bz2 | |
re PR target/37382 (ICE in extract_insn: <var_decl 0x7fda26ff4b40 swig_module>) 0))
PR target/37382
* expmed.c (extract_low_bits): Avoid creating invalid subregs.
* dse.c (find_shift_sequence): Use extract_low_bits instead of
simplify_gen_subreg.
* gcc.c-torture/compile/pr37382.c: New test.
From-SVN: r140265
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 0daf7fa..6099c4b 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -1991,8 +1991,22 @@ extract_low_bits (enum machine_mode mode, enum machine_mode src_mode, rtx src) return src; if (CONSTANT_P (src)) - return simplify_gen_subreg (mode, src, src_mode, - subreg_lowpart_offset (mode, src_mode)); + { + /* simplify_gen_subreg can't be used here, as if simplify_subreg + fails, it will happily create (subreg (symbol_ref)) or similar + invalid SUBREGs. */ + unsigned int byte = subreg_lowpart_offset (mode, src_mode); + rtx ret = simplify_subreg (mode, src, src_mode, byte); + if (ret) + return ret; + + if (GET_MODE (src) == VOIDmode + || !validate_subreg (mode, src_mode, src, byte)) + return NULL_RTX; + + src = force_reg (GET_MODE (src), src); + return gen_rtx_SUBREG (mode, src, byte); + } if (GET_MODE_CLASS (mode) == MODE_CC || GET_MODE_CLASS (src_mode) == MODE_CC) return NULL_RTX; |