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| author | Alan Modra <amodra@bigpond.net.au> | 2003-12-06 12:22:31 +0000 |
|---|---|---|
| committer | Alan Modra <amodra@gcc.gnu.org> | 2003-12-06 22:52:31 +1030 |
| commit | df2ef49bbf1d8e81db688fb49ddaf7e614b71961 (patch) | |
| tree | 806d63a055d1e8b44cd4e930d2d4c903a4cfaee2 /gcc/global.c | |
| parent | 929a3294725cb55f539bde39b50672cf24055c07 (diff) | |
| download | gcc-df2ef49bbf1d8e81db688fb49ddaf7e614b71961.zip gcc-df2ef49bbf1d8e81db688fb49ddaf7e614b71961.tar.gz gcc-df2ef49bbf1d8e81db688fb49ddaf7e614b71961.tar.bz2 | |
re PR rtl-optimization/13169 (asm using r30 or r31 confuses global_alloc)
PR 13169
* basic-block.h (PROP_ASM_SCAN): Define.
* final.c (regs_asm_clobbered): New array.
* regs.h (regs_asm_clobbered): Declare.
* flow.c (life_analysis): Init it.
(mark_set_regs): Set PROP_ASM_SCAN for asms.
(mark_set_1): Set regs_asm_clobbered.
* global.c (global_alloc): Don't set eliminable_regset when
regs_asm_clobbered.
From-SVN: r74363
Diffstat (limited to 'gcc/global.c')
| -rw-r--r-- | gcc/global.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/gcc/global.c b/gcc/global.c index c808e20..c337cd4 100644 --- a/gcc/global.c +++ b/gcc/global.c @@ -343,22 +343,42 @@ global_alloc (FILE *file) #ifdef ELIMINABLE_REGS for (i = 0; i < ARRAY_SIZE (eliminables); i++) { - SET_HARD_REG_BIT (eliminable_regset, eliminables[i].from); + bool cannot_elim + = (! CAN_ELIMINATE (eliminables[i].from, eliminables[i].to) + || (eliminables[i].to == STACK_POINTER_REGNUM && need_fp)); - if (! CAN_ELIMINATE (eliminables[i].from, eliminables[i].to) - || (eliminables[i].to == STACK_POINTER_REGNUM && need_fp)) - SET_HARD_REG_BIT (no_global_alloc_regs, eliminables[i].from); + if (!regs_asm_clobbered[eliminables[i].from]) + { + SET_HARD_REG_BIT (eliminable_regset, eliminables[i].from); + + if (cannot_elim) + SET_HARD_REG_BIT (no_global_alloc_regs, eliminables[i].from); + } + else if (cannot_elim) + error ("%s cannot be used in asm here", + reg_names[eliminables[i].from]); } #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM - SET_HARD_REG_BIT (eliminable_regset, HARD_FRAME_POINTER_REGNUM); - if (need_fp) - SET_HARD_REG_BIT (no_global_alloc_regs, HARD_FRAME_POINTER_REGNUM); + if (!regs_asm_clobbered[HARD_FRAME_POINTER_REGNUM]) + { + SET_HARD_REG_BIT (eliminable_regset, HARD_FRAME_POINTER_REGNUM); + if (need_fp) + SET_HARD_REG_BIT (no_global_alloc_regs, HARD_FRAME_POINTER_REGNUM); + } + else if (need_fp) + error ("%s cannot be used in asm here", + reg_names[HARD_FRAME_POINTER_REGNUM]); #endif #else - SET_HARD_REG_BIT (eliminable_regset, FRAME_POINTER_REGNUM); - if (need_fp) - SET_HARD_REG_BIT (no_global_alloc_regs, FRAME_POINTER_REGNUM); + if (!regs_asm_clobbered[FRAME_POINTER_REGNUM]) + { + SET_HARD_REG_BIT (eliminable_regset, FRAME_POINTER_REGNUM); + if (need_fp) + SET_HARD_REG_BIT (no_global_alloc_regs, FRAME_POINTER_REGNUM); + } + else if (need_fp) + error ("%s cannot be used in asm here", reg_names[FRAME_POINTER_REGNUM]); #endif /* Track which registers have already been used. Start with registers |