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| author | wilson <wilson@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-03-08 17:50:37 +0000 |
|---|---|---|
| committer | wilson <wilson@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-03-08 17:50:37 +0000 |
| commit | db8e9ed4b7297a4bc1639cadce0565ce25f98587 (patch) | |
| tree | 1a1b10b8f474423521688b3622cb9fc89a44b410 /gcc | |
| parent | 02f1afa569313a1bffb2ee2d197d0df4dce0c4a4 (diff) | |
| download | gcc-db8e9ed4b7297a4bc1639cadce0565ce25f98587.tar.gz | |
Fix performance problem on SH with unnecessary move instructions.
* local-alloc.c (combine_regs): Don't combine if we have a hard reg
for which CLASS_LIKELY_SPILLED_P is true.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@25644 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 3 | ||||
| -rw-r--r-- | gcc/local-alloc.c | 5 |
2 files changed, 8 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fc6d1efa11c..4f83b46e2dd 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,8 @@ Mon Mar 8 16:04:44 1999 Jim Wilson <wilson@cygnus.com> + * local-alloc.c (combine_regs): Don't combine if we have a hard reg + for which CLASS_LIKELY_SPILLED_P is true. + * unroll.c (loop_iterations): Only call loop_find_equiv_value if we have a REG or SUBREG. diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index ea97f33f5b5..d3dde6b7555 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -1648,6 +1648,11 @@ combine_regs (usedreg, setreg, may_save_copy, insn_number, insn, already_dead) || ureg == sreg /* Don't try to connect two different hardware registers. */ || (ureg < FIRST_PSEUDO_REGISTER && sreg < FIRST_PSEUDO_REGISTER) + /* Don't use a hard reg that might be spilled. */ + || (ureg < FIRST_PSEUDO_REGISTER + && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (ureg))) + || (sreg < FIRST_PSEUDO_REGISTER + && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (sreg))) /* Don't connect two different machine modes if they have different implications as to which registers may be used. */ || !MODES_TIEABLE_P (GET_MODE (usedreg), GET_MODE (setreg))) |