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(mark_used_regs, case SUBREG): Set reg_changes_size even for integer 

modes.

From-SVN: r9205
This commit is contained in:
Richard Kenner 1995-03-18 16:57:23 -05:00
parent 6bc2f582c2
commit 88285acf31
1 changed files with 9 additions and 4 deletions
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13
gcc/flow.c
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@ -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. */