diff options
Diffstat (limited to 'gcc/regrename.c')
| -rw-r--r-- | gcc/regrename.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/gcc/regrename.c b/gcc/regrename.c index ae25e2171fb..d24a6955923 100644 --- a/gcc/regrename.c +++ b/gcc/regrename.c @@ -1,5 +1,5 @@ /* Register renaming for the GNU compiler. - Copyright (C) 2000 Free Software Foundation, Inc. + Copyright (C) 2000, 2001 Free Software Foundation, Inc. This file is part of GNU CC. @@ -219,9 +219,14 @@ regrename_optimize () /* Don't clobber traceback for noreturn functions. */ if (frame_pointer_needed) { - SET_HARD_REG_BIT (unavailable, FRAME_POINTER_REGNUM); + int i; + + for (i = HARD_REGNO_NREGS (FRAME_POINTER_REGNUM, Pmode); i--;) + SET_HARD_REG_BIT (unavailable, FRAME_POINTER_REGNUM + i); + #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM - SET_HARD_REG_BIT (unavailable, HARD_FRAME_POINTER_REGNUM); + for (i = HARD_REGNO_NREGS (HARD_FRAME_POINTER_REGNUM, Pmode); i--;) + SET_HARD_REG_BIT (unavailable, HARD_FRAME_POINTER_REGNUM + i); #endif } @@ -233,8 +238,7 @@ regrename_optimize () struct du_chain *this = all_chains; struct du_chain *tmp, *last; HARD_REG_SET this_unavailable; - int reg = REGNO (*this->loc), treg; - int nregs = HARD_REGNO_NREGS (reg, GET_MODE (*this->loc)); + int reg = REGNO (*this->loc); int i; all_chains = this->next_chain; @@ -282,9 +286,10 @@ regrename_optimize () /* Now potential_regs is a reasonable approximation, let's have a closer look at each register still in there. */ - for (treg = 0; treg < FIRST_PSEUDO_REGISTER; treg++) + for (new_reg = 0; new_reg < FIRST_PSEUDO_REGISTER; new_reg++) { - new_reg = treg; + int nregs = HARD_REGNO_NREGS (new_reg, GET_MODE (*this->loc)); + for (i = nregs - 1; i >= 0; --i) if (TEST_HARD_REG_BIT (this_unavailable, new_reg + i) || fixed_regs[new_reg + i] @@ -292,6 +297,12 @@ regrename_optimize () /* Can't use regs which aren't saved by the prologue. */ || (! regs_ever_live[new_reg + i] && ! call_used_regs[new_reg + i]) +#ifdef LEAF_REGISTERS + /* We can't use a non-leaf register if we're in a + leaf function. */ + || (current_function_is_leaf + && !LEAF_REGISTERS[new_reg + i]) +#endif #ifdef HARD_REGNO_RENAME_OK || ! HARD_REGNO_RENAME_OK (reg + i, new_reg + i) #endif |