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(gen_reload): Handle paradoxical SUBREGs.

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From-SVN: r9208
This commit is contained in:
Richard Kenner 1995-03-18 16:59:10 -05:00
parent 94bafba741
commit 7a5b18b055
1 changed files with 15 additions and 1 deletions
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16
gcc/reload1.c
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@ -1,5 +1,5 @@
/* Reload pseudo regs into hard regs for insns that require hard regs.
Copyright (C) 1987, 88, 89, 92, 93, 1994 Free Software Foundation, Inc.
Copyright (C) 1987, 88, 89, 92, 93, 94, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -6649,6 +6649,20 @@ gen_reload (out, in, opnum, type)
enum reload_type type;
{
rtx last = get_last_insn ();
rtx tem;
/* If IN is a paradoxical SUBREG, remove it and try to put the
opposite SUBREG on OUT. Likewise for a paradoxical SUBREG on OUT. */
if (GET_CODE (in) == SUBREG
&& (GET_MODE_SIZE (GET_MODE (in))
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (in))))
&& (tem = gen_lowpart_common (GET_MODE (SUBREG_REG (in)), out)) != 0)
in = SUBREG_REG (in), out = tem;
else if (GET_CODE (out) == SUBREG
&& (GET_MODE_SIZE (GET_MODE (out))
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (out))))
&& (tem = gen_lowpart_common (GET_MODE (SUBREG_REG (out)), in)) != 0)
out = SUBREG_REG (out), in = tem;
/* How to do this reload can get quite tricky. Normally, we are being
asked to reload a simple operand, such as a MEM, a constant, or a pseudo