/* Data flow analysis for GNU compiler.
- Copyright (C) 1987, 88, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1987, 88, 92-96, 1997 Free Software Foundation, Inc.
This file is part of GNU CC.
/* Return 1 if register REGNO was used before it was set.
In other words, if it is live at function entry.
- Don't count global register variables, though. */
+ Don't count global register variables or variables in registers
+ that can be used for function arg passing, though. */
int
regno_uninitialized (regno)
int regno;
{
if (n_basic_blocks == 0
- || (regno < FIRST_PSEUDO_REGISTER && global_regs[regno]))
+ || (regno < FIRST_PSEUDO_REGISTER
+ && (global_regs[regno] || FUNCTION_ARG_REGNO_P (regno))))
return 0;
return (basic_block_live_at_start[0][regno / REGSET_ELT_BITS]