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| author | Kwok Cheung Yeung <kcy@codesourcery.com> | 2019-11-10 18:22:38 +0000 |
|---|---|---|
| committer | Kwok Cheung Yeung <kcy@gcc.gnu.org> | 2019-11-10 18:22:38 +0000 |
| commit | 4b77a3806c4f2e27d149da326a689286043e433c (patch) | |
| tree | f0271bda2d2013bec6262840401f4aae8802ecab /gcc/lra-spills.c | |
| parent | b53513884626d162d4fad4bf144207f5fb762910 (diff) | |
| download | gcc-4b77a3806c4f2e27d149da326a689286043e433c.zip gcc-4b77a3806c4f2e27d149da326a689286043e433c.tar.gz gcc-4b77a3806c4f2e27d149da326a689286043e433c.tar.bz2 | |
[LRA] Do not use eliminable registers for spilling
The liveness of eliminable hard registers is not tracked by LRA between
basic blocks, so they should not be used as spill registers as LRA may
decide to allocate them to pseudos while the spilled value is still live.
2019-11-10 Kwok Cheung Yeung <kcy@codesourcery.com>
gcc/
* lra-spills.c (assign_spill_hard_regs): Do not spill into
registers in eliminable_regset.
From-SVN: r278024
Diffstat (limited to 'gcc/lra-spills.c')
| -rw-r--r-- | gcc/lra-spills.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/lra-spills.c b/gcc/lra-spills.c index 0068e52..54f76cc 100644 --- a/gcc/lra-spills.c +++ b/gcc/lra-spills.c @@ -283,6 +283,8 @@ assign_spill_hard_regs (int *pseudo_regnos, int n) for (k = 0; k < spill_class_size; k++) { hard_regno = ira_class_hard_regs[spill_class][k]; + if (TEST_HARD_REG_BIT (eliminable_regset, hard_regno)) + continue; if (! overlaps_hard_reg_set_p (conflict_hard_regs, mode, hard_regno)) break; } |