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| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/c4x/c4x.c | 11 |
2 files changed, 13 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a710137..fd4905a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2001-01-05 Michael Hayes <m.hayes@elec.canterbury.ac.nz> + * config/c4x/c4x.c (c4x_expand_prologue): Don't compile an ISR + with more than 32767 words of local storage. + +2001-01-05 Michael Hayes <m.hayes@elec.canterbury.ac.nz> + * config/c4x/c4x.c (c4x_init_builtins): Remove builtin support for 'abs', 'labs', and 'fabs'. (c4x_expand_builtin): Likewise. diff --git a/gcc/config/c4x/c4x.c b/gcc/config/c4x/c4x.c index 230b54c..496da47 100644 --- a/gcc/config/c4x/c4x.c +++ b/gcc/config/c4x/c4x.c @@ -826,10 +826,15 @@ c4x_expand_prologue () insn = emit_insn (gen_movqi (gen_rtx_REG (QImode, AR3_REGNO), gen_rtx_REG (QImode, SP_REGNO))); RTX_FRAME_RELATED_P (insn) = 1; - /* FIXME: Assume ISR doesn't require more than 32767 words - of local variables. */ + /* We require that an ISR uses fewer than 32768 words of + local variables, otherwise we have to go to lots of + effort to save a register, load it with the desired size, + adjust the stack pointer, and then restore the modified + register. Frankly, I think it is a poor ISR that + requires more than 32767 words of local temporary + storage! */ if (size > 32767) - error ("ISR %s requires %d words of local vars, max is 32767.", + fatal ("ISR %s requires %d words of local vars, max is 32767.", current_function_name, size); insn = emit_insn (gen_addqi3 (gen_rtx_REG (QImode, SP_REGNO), gen_rtx_REG (QImode, SP_REGNO), |