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From-SVN: r223
This commit is contained in:
Richard Stallman 1992-01-20 18:46:58 +00:00
parent 70beb07542
commit b4b4db944d
1 changed files with 22 additions and 4 deletions
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26
gcc/global.c
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@ -308,15 +308,33 @@ global_alloc (file)
/* Track which registers have already been used. Start with registers
explicitly in the rtl, then registers allocated by local register
allocation.
We consider registers that do not have to be saved over calls as if
they were already used since there is no cost in using them. */
allocation. */
CLEAR_HARD_REG_SET (regs_used_so_far);
#ifdef LEAF_REGISTERS
/* If we are doing the leaf function optimization, and this is a leaf
function, it means that the registers that take work to save are those
that need a register window. So prefer the ones that can be used in
a leaf function. */
{
char *cheap_regs;
static char leaf_regs[] = LEAF_REGISTERS;
if (only_leaf_regs_used () && leaf_function_p ())
cheap_regs = leaf_regs;
else
cheap_regs = call_used_regs;
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (regs_ever_live[i] || cheap_regs[i])
SET_HARD_REG_BIT (regs_used_so_far, i);
}
#else
/* We consider registers that do not have to be saved over calls as if
they were already used since there is no cost in using them. */
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (regs_ever_live[i] || call_used_regs[i])
SET_HARD_REG_BIT (regs_used_so_far, i);
#endif
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
if (reg_renumber[i] >= 0)