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(gen_lowpart_common, gen_highpart, operand_subword): Don't make a new

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REG for stack, frame, or arg pointer.

From-SVN: r2382
This commit is contained in:
Richard Kenner 1992-10-09 07:30:07 -04:00
parent 26ecfc7614
commit cb00f51acf
1 changed files with 23 additions and 3 deletions
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26
gcc/emit-rtl.c
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@ -529,7 +529,14 @@ gen_lowpart_common (mode, x)
else if (REGNO (x) < FIRST_PSEUDO_REGISTER
/* integrate.c can't handle parts of a return value register. */
&& (! REG_FUNCTION_VALUE_P (x)
|| ! rtx_equal_function_value_matters))
|| ! rtx_equal_function_value_matters)
/* We want to keep the stack, frame, and arg pointers
special. */
&& REGNO (x) != FRAME_POINTER_REGNUM
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
&& REGNO (x) != ARG_POINTER_REGNUM
#endif
&& REGNO (x) != STACK_POINTER_REGNUM)
return gen_rtx (REG, mode, REGNO (x) + word);
else
return gen_rtx (SUBREG, mode, x, word);
@ -776,7 +783,13 @@ gen_highpart (mode, x)
- MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD))
/ UNITS_PER_WORD);
#endif
if (REGNO (x) < FIRST_PSEUDO_REGISTER)
if (REGNO (x) < FIRST_PSEUDO_REGISTER
/* We want to keep the stack, frame, and arg pointers special. */
&& REGNO (x) != FRAME_POINTER_REGNUM
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
&& REGNO (x) != ARG_POINTER_REGNUM
#endif
&& REGNO (x) != STACK_POINTER_REGNUM)
return gen_rtx (REG, mode, REGNO (x) + word);
else
return gen_rtx (SUBREG, mode, x, word);
@ -860,7 +873,14 @@ operand_subword (op, i, validate_address, mode)
return 0;
else if (REGNO (op) >= FIRST_PSEUDO_REGISTER
|| (REG_FUNCTION_VALUE_P (op)
&& rtx_equal_function_value_matters))
&& rtx_equal_function_value_matters)
/* We want to keep the stack, frame, and arg pointers
special. */
|| REGNO (op) == FRAME_POINTER_REGNUM
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|| REGNO (op) == ARG_POINTER_REGNUM
#endif
|| REGNO (op) == STACK_POINTER_REGNUM)
return gen_rtx (SUBREG, word_mode, op, i);
else
return gen_rtx (REG, word_mode, REGNO (op) + i);