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alias.c (nonoverlapping_memrefs_p): Not overlapping if one base is constant and one is on frame.

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* alias.c (nonoverlapping_memrefs_p): Not overlapping if one base is
	constant and one is on frame.
	If know memref offset, adjust size from decl.

From-SVN: r46925
This commit is contained in:
Richard Kenner 2001-11-11 10:51:17 +00:00 • committed by Richard Kenner
parent 6f38bb171d
commit d746694a45
2 changed files with 18 additions and 9 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Sun Nov 11 05:56:01 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* alias.c (nonoverlapping_memrefs_p): Not overlapping if one base is
constant and one is on frame.
If know memref offset, adjust size from decl.
2001-11-11 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* alpha/unicosmk.h (ASM_OUTPUT_DOUBLE, ASM_OUTPUT_FLOAT): Fix

21
gcc/alias.c
View file

@ -1798,13 +1798,16 @@ nonoverlapping_memrefs_p (x, y)
if (GET_CODE (basey) == PLUS && GET_CODE (XEXP (basey, 1)) == CONST_INT)
offsety = INTVAL (XEXP (basey, 1)), basey = XEXP (basey, 0);
/* If the bases are both constant and they are different, we know these
do not overlap. If they are both registers, we can only deduce
something if they are the same register. */
if (CONSTANT_P (basex) && CONSTANT_P (basey) && ! rtx_equal_p (basex, basey))
return 1;
else if (! rtx_equal_p (basex, basey))
return 0;
/* If the bases are different, we know they do not overlap if both
are constants or if one is a constant and the other a pointer into the
stack frame. Otherwise a different base means we can't tell if they
overlap or not. */
if (! rtx_equal_p (basex, basey))
return ((CONSTANT_P (basex) && CONSTANT_P (basey))
|| (CONSTANT_P (basex) && REG_P (basey)
&& REGNO (basey) <= LAST_VIRTUAL_REGISTER)
|| (CONSTANT_P (basey) && REG_P (basex)
&& REGNO (basex) <= LAST_VIRTUAL_REGISTER));
sizex = (REG_P (rtlx) ? GET_MODE_SIZE (GET_MODE (rtlx))
: MEM_SIZE (rtlx) ? INTVAL (MEM_SIZE (rtlx))
@ -1816,9 +1819,9 @@ nonoverlapping_memrefs_p (x, y)
/* If we have an offset or size for either memref, it can update the values
computed above. */
if (MEM_OFFSET (x))
offsetx += INTVAL (MEM_OFFSET (x));
offsetx += INTVAL (MEM_OFFSET (x)), sizex -= INTVAL (MEM_OFFSET (x));
if (MEM_OFFSET (y))
offsety += INTVAL (MEM_OFFSET (y));
offsety += INTVAL (MEM_OFFSET (y)), sizey -= INTVAL (MEM_OFFSET (y));
if (MEM_SIZE (x))
sizex = INTVAL (MEM_SIZE (x));