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(stupid_mark_refs): Handle SUBREG of pseudo-reg in a SET_DEST same as

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we handle a pseudo-reg in a SET_DEST.

From-SVN: r10541
This commit is contained in:
Richard Kenner 1995-10-29 07:45:32 -05:00
parent 4f069e1470
commit 2d43e08975
1 changed files with 12 additions and 3 deletions
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15
gcc/stupid.c
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@ -1,5 +1,5 @@
/* Dummy data flow analysis for GNU compiler in nonoptimizing mode. /* Dummy data flow analysis for GNU compiler in nonoptimizing mode.
Copyright (C) 1987, 1991, 1994 Free Software Foundation, Inc. Copyright (C) 1987, 1991, 1994, 1995 Free Software Foundation, Inc.
This file is part of GNU CC. This file is part of GNU CC.
@ -423,10 +423,19 @@ stupid_mark_refs (x, insn)
if (code == SET || code == CLOBBER) if (code == SET || code == CLOBBER)
{ {
if (SET_DEST (x) != 0 && GET_CODE (SET_DEST (x)) == REG) if (SET_DEST (x) != 0
&& (GET_CODE (SET_DEST (x)) == REG
|| (GET_CODE (SET_DEST (x)) == SUBREG
&& GET_CODE (SUBREG_REG (SET_DEST (x))) == REG
&& (REGNO (SUBREG_REG (SET_DEST (x)))
>= FIRST_PSEUDO_REGISTER))))
{ {
/* Register is being assigned. */ /* Register is being assigned. */
regno = REGNO (SET_DEST (x)); /* If setting a SUBREG, we treat the entire reg as being set. */
if (GET_CODE (SET_DEST (x)) == SUBREG)
regno = REGNO (SUBREG_REG (SET_DEST (x)));
else
regno = REGNO (SET_DEST (x));
/* For hard regs, update the where-live info. */ /* For hard regs, update the where-live info. */
if (regno < FIRST_PSEUDO_REGISTER) if (regno < FIRST_PSEUDO_REGISTER)