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(regno_uninitialized): Return 0 if reg is used for args.

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From-SVN: r13562
This commit is contained in:
Richard Kenner 1997-01-29 16:00:25 -05:00
parent 538fe8cddb
commit 6a45254e5b
1 changed files with 5 additions and 3 deletions
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8
gcc/flow.c
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@ -1,5 +1,5 @@
/* 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.
@ -1897,14 +1897,16 @@ libcall_dead_p (x, needed, note, insn)
/* 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]