From 69f6e760a80eef94fa88119e4f2ac4c63353dc78 Mon Sep 17 00:00:00 2001 From: Michael Hayes Date: Fri, 5 Jan 2001 04:09:02 +0000 Subject: [PATCH] c4x.c (c4x_expand_prologue): Don't compile an ISR with more than 32767 words of local storage. * config/c4x/c4x.c (c4x_expand_prologue): Don't compile an ISR with more than 32767 words of local storage. From-SVN: r38703 --- gcc/ChangeLog | 5 +++++ gcc/config/c4x/c4x.c | 11 ++++++++--- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a710137906b..fd4905ae632 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2001-01-05 Michael Hayes + + * 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 * config/c4x/c4x.c (c4x_init_builtins): Remove builtin support diff --git a/gcc/config/c4x/c4x.c b/gcc/config/c4x/c4x.c index 230b54cf0d2..496da47ada2 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), -- 2.30.2