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| author | Richard Henderson <rth@redhat.com> | 2002-10-07 03:22:49 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2002-10-07 03:22:49 -0700 |
| commit | de3beb7c7d5dc4ee86e0b9bb14199b47d2e988bf (patch) | |
| tree | 4f473610f9cfb03c7a89d174e7077ffe161fe12a /gcc/config | |
| parent | 01f4137fea19db8118b225ce86b39aa6831b7ba2 (diff) | |
| download | gcc-de3beb7c7d5dc4ee86e0b9bb14199b47d2e988bf.zip gcc-de3beb7c7d5dc4ee86e0b9bb14199b47d2e988bf.tar.gz gcc-de3beb7c7d5dc4ee86e0b9bb14199b47d2e988bf.tar.bz2 | |
i960.c (i960_setup_incoming_varargs): Create a new rtx for comparing the argument pointer against zero.
* config/i960/i960.c (i960_setup_incoming_varargs): Create a
new rtx for comparing the argument pointer against zero.
(i960_va_start): Similarly.
From-SVN: r57897
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i960/i960.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/gcc/config/i960/i960.c b/gcc/config/i960/i960.c index bde6710..f353c72 100644 --- a/gcc/config/i960/i960.c +++ b/gcc/config/i960/i960.c @@ -2552,16 +2552,20 @@ i960_setup_incoming_varargs (cum, mode, type, pretend_size, no_rtl) if (cum->ca_nstackparms == 0 && first_reg < NPARM_REGS && !no_rtl) { rtx label = gen_label_rtx (); - rtx regblock; + rtx regblock, fake_arg_pointer_rtx; - /* If arg_pointer_rtx == 0, no arguments were passed on the stack + /* Use a different rtx than arg_pointer_rtx so that cse and friends + can go on believing that the argument pointer can never be zero. */ + fake_arg_pointer_rtx = gen_raw_REG (Pmode, ARG_POINTER_REGNUM); + + /* If the argument pointer is 0, no arguments were passed on the stack and we need to allocate a chunk to save the registers (if any arguments were passed on the stack the caller would allocate the 48 bytes as well). We must allocate all 48 bytes (12*4) because va_start assumes it. */ - emit_insn (gen_cmpsi (arg_pointer_rtx, const0_rtx)); + emit_insn (gen_cmpsi (fake_arg_pointer_rtx, const0_rtx)); emit_jump_insn (gen_bne (label)); - emit_insn (gen_rtx_SET (VOIDmode, arg_pointer_rtx, + emit_insn (gen_rtx_SET (VOIDmode, fake_arg_pointer_rtx, stack_pointer_rtx)); emit_insn (gen_rtx_SET (VOIDmode, stack_pointer_rtx, memory_address (SImode, @@ -2598,6 +2602,7 @@ i960_va_start (valist, nextarg) rtx nextarg ATTRIBUTE_UNUSED; { tree s, t, base, num; + rtx fake_arg_pointer_rtx; /* The array type always decays to a pointer before we get here, so we can't use ARRAY_REF. */ @@ -2606,7 +2611,10 @@ i960_va_start (valist, nextarg) build (PLUS_EXPR, unsigned_type_node, valist, TYPE_SIZE_UNIT (TREE_TYPE (valist)))); - s = make_tree (unsigned_type_node, arg_pointer_rtx); + /* Use a different rtx than arg_pointer_rtx so that cse and friends + can go on believing that the argument pointer can never be zero. */ + fake_arg_pointer_rtx = gen_raw_REG (Pmode, ARG_POINTER_REGNUM); + s = make_tree (unsigned_type_node, fake_arg_pointer_rtx); t = build (MODIFY_EXPR, unsigned_type_node, base, s); TREE_SIDE_EFFECTS (t) = 1; expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL); |