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riscv-gcc-1
Commit 6a45254e by Richard Kenner
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(regno_uninitialized): Return 0 if reg is used for args. 

From-SVN: r13562
parent 538fe8cd
Showing with 5 additions and 3 deletions
gcc/flow.c
/* Data flow analysis for GNU compiler. /* 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. This file is part of GNU CC.
...@@ -1897,14 +1897,16 @@ libcall_dead_p (x, needed, note, insn) ...@@ -1897,14 +1897,16 @@ libcall_dead_p (x, needed, note, insn)
/* Return 1 if register REGNO was used before it was set. /* Return 1 if register REGNO was used before it was set.
In other words, if it is live at function entry. 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 int
regno_uninitialized (regno) regno_uninitialized (regno)
int regno; int regno;
{ {
if (n_basic_blocks == 0 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 0;
return (basic_block_live_at_start[0][regno / REGSET_ELT_BITS] return (basic_block_live_at_start[0][regno / REGSET_ELT_BITS]
......
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