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emit-rtl.c (gen_lowpart_common): Skip count by HARD_REGNO_NREGS.

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* emit-rtl.c (gen_lowpart_common): Skip count by HARD_REGNO_NREGS.
(gen_highpart): Likewise.

From-SVN: r18945
This commit is contained in:
Richard Henderson 1998-04-01 17:33:22 -08:00 committed by Richard Henderson
parent 79363e2fa5
commit 4901a64393
2 changed files with 23 additions and 10 deletions
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3
gcc/ChangeLog
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@ -3,6 +3,9 @@ Thu Apr 2 01:01:34 1998 Richard Henderson <rth@cygnus.com>
* configure (alpha-*-linuxecoff, alpha-*-linux-gnulibc1):
Run fixincludes.
* emit-rtl.c (gen_lowpart_common): Skip count by HARD_REGNO_NREGS.
(gen_highpart): Likewise.
Wed Apr 1 22:26:22 1998 Jeffrey A Law (law@cygnus.com)
* fold-const.c optimze_bit_field_compare): Initialize rnbitpos,

30
gcc/emit-rtl.c
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@ -652,6 +652,17 @@ gen_lowpart_common (mode, x)
: gen_rtx_SUBREG (mode, SUBREG_REG (x), SUBREG_WORD (x) + word));
else if (GET_CODE (x) == REG)
{
/* Let the backend decide how many registers to skip. This is needed
in particular for Sparc64 where fp regs are smaller than a word. */
/* ??? Note that subregs are now ambiguous, in that those against
pseudos are sized by the Word Size, while those against hard
regs are sized by the underlying register size. Better would be
to always interpret the subreg offset parameter as bytes or bits. */
if (WORDS_BIG_ENDIAN && REGNO (x) < FIRST_PSEUDO_REGISTER)
word = (HARD_REGNO_NREGS (REGNO (x), GET_MODE (x))
- HARD_REGNO_NREGS (REGNO (x), mode));
/* 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.
But we do do this if the current REG is not valid for its
@ -1002,17 +1013,16 @@ gen_highpart (mode, x)
{
int word = 0;
if (! WORDS_BIG_ENDIAN
&& GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD)
word = ((GET_MODE_SIZE (GET_MODE (x))
- MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD))
/ UNITS_PER_WORD);
/* Let the backend decide how many registers to skip. This is needed
in particular for sparc64 where fp regs are smaller than a word. */
/* ??? Note that subregs are now ambiguous, in that those against
pseudos are sized by the Word Size, while those against hard
regs are sized by the underlying register size. Better would be
to always interpret the subreg offset parameter as bytes or bits. */
/*
* ??? This fails miserably for complex values being passed in registers
* where the sizeof the real and imaginary part are not equal to the
* sizeof SImode. FIXME
*/
if (! WORDS_BIG_ENDIAN && REGNO (x) < FIRST_PSEUDO_REGISTER)
word = (HARD_REGNO_NREGS (REGNO (x), GET_MODE (x))
- HARD_REGNO_NREGS (REGNO (x), mode));
if (REGNO (x) < FIRST_PSEUDO_REGISTER
/* integrate.c can't handle parts of a return value register. */