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(gen_lowpart_common): Return a new hard reg even if not valid in MODE 

if the input REG is not valid in its mode.

From-SVN: r6249
This commit is contained in:
Richard Kenner 1993-12-20 19:16:01 -05:00
parent 405c549531
commit 674d5d8bef
1 changed files with 7 additions and 2 deletions
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9
gcc/emit-rtl.c
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@ -595,9 +595,14 @@ gen_lowpart_common (mode, x)
else if (GET_CODE (x) == REG)
{
/* If the register is not valid for MODE, return 0. If we don't
do this, there is no way to fix up the resulting REG later. */
do this, there is no way to fix up the resulting REG later.
But we do do this if the current REG is not valid for its
mode. This latter is a kludge, but is required due to the
way that parameters are passed on some machines, most
notably Sparc. */
if (REGNO (x) < FIRST_PSEUDO_REGISTER
&& ! HARD_REGNO_MODE_OK (REGNO (x) + word, mode))
&& ! HARD_REGNO_MODE_OK (REGNO (x) + word, mode)
&& HARD_REGNO_MODE_OK (REGNO (x), GET_MODE (x)))
return 0;
else if (REGNO (x) < FIRST_PSEUDO_REGISTER
/* integrate.c can't handle parts of a return value register. */