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| author | Richard Kenner <kenner@gcc.gnu.org> | 1997-01-29 16:00:25 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1997-01-29 16:00:25 -0500 |
| commit | 6a45254e5be88f3767f80cf19d640eb44b23c1e7 (patch) | |
| tree | c9cea23da69849d09d230e9e8dac7e6e68d6d0f7 /gcc/flow.c | |
| parent | 538fe8cddb437db19ca4bd0b833084e701ef71e1 (diff) | |
| download | gcc-6a45254e5be88f3767f80cf19d640eb44b23c1e7.zip gcc-6a45254e5be88f3767f80cf19d640eb44b23c1e7.tar.gz gcc-6a45254e5be88f3767f80cf19d640eb44b23c1e7.tar.bz2 | |
(regno_uninitialized): Return 0 if reg is used for args.
From-SVN: r13562
Diffstat (limited to 'gcc/flow.c')
| -rw-r--r-- | gcc/flow.c | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -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] |