diff options
| author | Richard Kenner <kenner@gcc.gnu.org> | 1995-03-18 16:57:23 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1995-03-18 16:57:23 -0500 |
| commit | 88285acf31c379ab8de092d79027dd164f0b21bc (patch) | |
| tree | b0a51875dc451e9c5ef69376bdda3e5da7efc070 /gcc | |
| parent | 6bc2f582c27d6880d5cfae7cdc1cfc9009afb2ef (diff) | |
| download | gcc-88285acf31c379ab8de092d79027dd164f0b21bc.zip gcc-88285acf31c379ab8de092d79027dd164f0b21bc.tar.gz gcc-88285acf31c379ab8de092d79027dd164f0b21bc.tar.bz2 | |
(mark_used_regs, case SUBREG): Set reg_changes_size even for integer
modes.
From-SVN: r9205
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/flow.c | 13 |
1 files changed, 9 insertions, 4 deletions
@@ -1,5 +1,5 @@ /* Data flow analysis for GNU compiler. - Copyright (C) 1987, 1988, 1992, 1993, 1994 Free Software Foundation, Inc. + Copyright (C) 1987, 88, 92, 93, 94, 1995 Free Software Foundation, Inc. This file is part of GNU CC. @@ -2379,9 +2379,7 @@ mark_used_regs (needed, live, x, final, insn) if (GET_CODE (SUBREG_REG (x)) == REG && REGNO (SUBREG_REG (x)) >= FIRST_PSEUDO_REGISTER && (GET_MODE_SIZE (GET_MODE (x)) - != GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) - && (INTEGRAL_MODE_P (GET_MODE (x)) - || INTEGRAL_MODE_P (GET_MODE (SUBREG_REG (x))))) + != GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))) reg_changes_size[REGNO (SUBREG_REG (x))] = 1; /* While we're here, optimize this case. */ @@ -2572,6 +2570,13 @@ mark_used_regs (needed, live, x, final, insn) || GET_CODE (testreg) == SIGN_EXTRACT || GET_CODE (testreg) == SUBREG) { + if (GET_CODE (testreg) == SUBREG + && GET_CODE (SUBREG_REG (testreg)) == REG + && REGNO (SUBREG_REG (testreg)) >= FIRST_PSEUDO_REGISTER + && (GET_MODE_SIZE (GET_MODE (testreg)) + != GET_MODE_SIZE (GET_MODE (SUBREG_REG (testreg))))) + reg_changes_size[REGNO (SUBREG_REG (testreg))] = 1; + /* Modifying a single register in an alternate mode does not use any of the old value. But these other ways of storing in a register do use the old value. */ |