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| author | Richard Kenner <kenner@gcc.gnu.org> | 1994-11-18 18:23:49 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1994-11-18 18:23:49 -0500 |
| commit | 4841ba4b1d6d93eb360f046d908643d26f0b042c (patch) | |
| tree | 4701fcef836e9a8b2749bc3156de8d503b06ee76 /gcc/regclass.c | |
| parent | 1ced4e9b049df5ba9f4ba699f6df044c463061ef (diff) | |
| download | gcc-4841ba4b1d6d93eb360f046d908643d26f0b042c.zip gcc-4841ba4b1d6d93eb360f046d908643d26f0b042c.tar.gz gcc-4841ba4b1d6d93eb360f046d908643d26f0b042c.tar.bz2 | |
(record_reg_classes): When handling case of single SET between a hard register alone in a class and a pseudo...
(record_reg_classes): When handling case of single SET
between a hard register alone in a class and a pseudo, make sure the
register is the only member of the class.
From-SVN: r8511
Diffstat (limited to 'gcc/regclass.c')
| -rw-r--r-- | gcc/regclass.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/gcc/regclass.c b/gcc/regclass.c index 129fbaf..5e75854 100644 --- a/gcc/regclass.c +++ b/gcc/regclass.c @@ -1364,6 +1364,7 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn) int regno = REGNO (ops[!i]); enum machine_mode mode = GET_MODE (ops[!i]); int class; + int nr; if (regno >= FIRST_PSEUDO_REGISTER && prefclass != 0 && (reg_class_size[prefclass[regno]] @@ -1373,7 +1374,21 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn) for (class = 0; class < N_REG_CLASSES; class++) if (TEST_HARD_REG_BIT (reg_class_contents[class], regno) && reg_class_size[class] == CLASS_MAX_NREGS (class, mode)) - op_costs[i].cost[class] = -1; + { + if (reg_class_size[class] == 1) + op_costs[i].cost[class] = -1; + else + { + for (nr = 0; nr < HARD_REGNO_NREGS(regno, mode); nr++) + { + if (!TEST_HARD_REG_BIT (reg_class_contents[class], regno + nr)) + break; + } + + if (nr == HARD_REGNO_NREGS(regno,mode)) + op_costs[i].cost[class] = -1; + } + } } } |