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| author | Jim Wilson <wilson@gcc.gnu.org> | 1993-10-05 16:22:04 -0700 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1993-10-05 16:22:04 -0700 |
| commit | df5f5124d52b891ed9f0ee6da1d21d6ef4fbc82f (patch) | |
| tree | 551127c5c736e073b2526982560a9af56214bc1d /gcc/sched.c | |
| parent | 67c8d7deb23a770b7aca61dd995c98f465c1ba0b (diff) | |
| download | gcc-df5f5124d52b891ed9f0ee6da1d21d6ef4fbc82f.zip gcc-df5f5124d52b891ed9f0ee6da1d21d6ef4fbc82f.tar.gz gcc-df5f5124d52b891ed9f0ee6da1d21d6ef4fbc82f.tar.bz2 | |
(sched_analyze_2): Make volatile asms depend on all
pseudo registers.
From-SVN: r5621
Diffstat (limited to 'gcc/sched.c')
| -rw-r--r-- | gcc/sched.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/sched.c b/gcc/sched.c index 7f9c831..ac0b7a5 100644 --- a/gcc/sched.c +++ b/gcc/sched.c @@ -1940,11 +1940,16 @@ sched_analyze_2 (x, insn) rtx u; /* Traditional and volatile asm instructions must be considered to use - and clobber all hard registers and all of memory. So must - TRAP_IF and UNSPEC_VOLATILE operations. */ + and clobber all hard registers, all pseudo-registers and all of + memory. So must TRAP_IF and UNSPEC_VOLATILE operations. + + Consider for instance a volatile asm that changes the fpu rounding + mode. An insn should not be moved across this even if it only uses + pseudo-regs because it might give an incorrectly rounded result. */ if (code != ASM_OPERANDS || MEM_VOLATILE_P (x)) { - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + int max_reg = max_reg_num (); + for (i = 0; i < max_reg; i++) { for (u = reg_last_uses[i]; u; u = XEXP (u, 1)) add_dependence (insn, XEXP (u, 0), REG_DEP_ANTI); |