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| author | Vladimir Makarov <vmakarov@redhat.com> | 2008-10-06 15:34:26 +0000 |
|---|---|---|
| committer | Vladimir Makarov <vmakarov@gcc.gnu.org> | 2008-10-06 15:34:26 +0000 |
| commit | 3517d3a0870e7081d4ded0fa4cc590c602713a8c (patch) | |
| tree | 6208c8b2d1a94f1fa3c249de54b5c7b56339df26 /gcc/doc | |
| parent | e84319a3ffa34ad21ba267ec06d2dfc6fa180bc7 (diff) | |
| download | gcc-3517d3a0870e7081d4ded0fa4cc590c602713a8c.zip gcc-3517d3a0870e7081d4ded0fa4cc590c602713a8c.tar.gz gcc-3517d3a0870e7081d4ded0fa4cc590c602713a8c.tar.bz2 | |
re PR middle-end/37535 (gcc/libgcc2.c:404: internal compiler error: Floating point exception)
2008-10-06 Vladimir Makarov <vmakarov@redhat.com>
PR middle-end/37535
* ira-lives.c (mark_reg_live, mark_reg_dead): New functions.
(mark_ref_live, mark_ref_dead): Use them.
(def_conflicts_with_inputs_p): Remove.
(mark_early_clobbers): New function.
(process_bb_node_lives): Call preprocess_constraints and
mark_early_clobbers.
* doc/rtx.texi (clobber): Change how RA deals with clobbers.
From-SVN: r140906
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/rtl.texi | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index 148e19d..a12de21 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -2930,9 +2930,11 @@ constituent instructions might not. When a @code{clobber} expression for a register appears inside a @code{parallel} with other side effects, the register allocator guarantees that the register is unoccupied both before and after that -insn. However, the reload phase may allocate a register used for one of -the inputs unless the @samp{&} constraint is specified for the selected -alternative (@pxref{Modifiers}). You can clobber either a specific hard +insn if it is a hard register clobber or the @samp{&} constraint +is specified for at least one alternative (@pxref{Modifiers}) of the +clobber. However, the reload phase may allocate a register used for +one of the inputs unless the @samp{&} constraint is specified for the +selected alternative. You can clobber either a specific hard register, a pseudo register, or a @code{scratch} expression; in the latter two cases, GCC will allocate a hard register that is available there for use as a temporary. |