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(true_dependence, anti_dependence, output_dependence): 

Assume that MEM_IN_STRUCT_P QImode varying addresses can overlap a
non-MEM_IN_STRUCT_P fixed address.

From-SVN: r3426
This commit is contained in:
Jim Wilson 1993-02-05 15:33:36 -08:00
parent 0a56ad627e
commit 0b298be417
1 changed files with 11 additions and 2 deletions
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13
gcc/sched.c
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@ -696,8 +696,11 @@ memrefs_conflict_p (xsize, x, ysize, y, c)
changed. A volatile and non-volatile reference can be interchanged
though.
A MEM_IN_STRUCT reference at a varying address can never conflict with a
non-MEM_IN_STRUCT reference at a fixed address. */
A MEM_IN_STRUCT reference at a non-QImode varying address can never
conflict with a non-MEM_IN_STRUCT reference at a fixed address. We must
allow QImode aliasing because the ANSI C standard allows character
pointers to alias anything. We are assuming that characters are
always QImode here. */
/* Read dependence: X is read after read in MEM takes place. There can
only be a dependence here if both reads are volatile. */
@ -731,8 +734,10 @@ true_dependence (mem, x)
|| (memrefs_conflict_p (SIZE_FOR_MODE (mem), XEXP (mem, 0),
SIZE_FOR_MODE (x), XEXP (x, 0), 0)
&& ! (MEM_IN_STRUCT_P (mem) && rtx_addr_varies_p (mem)
&& GET_MODE (mem) != QImode
&& ! MEM_IN_STRUCT_P (x) && ! rtx_addr_varies_p (x))
&& ! (MEM_IN_STRUCT_P (x) && rtx_addr_varies_p (x)
&& GET_MODE (x) != QImode
&& ! MEM_IN_STRUCT_P (mem) && ! rtx_addr_varies_p (mem))));
}
@ -753,8 +758,10 @@ anti_dependence (mem, x)
|| (memrefs_conflict_p (SIZE_FOR_MODE (mem), XEXP (mem, 0),
SIZE_FOR_MODE (x), XEXP (x, 0), 0)
&& ! (MEM_IN_STRUCT_P (mem) && rtx_addr_varies_p (mem)
&& GET_MODE (mem) != QImode
&& ! MEM_IN_STRUCT_P (x) && ! rtx_addr_varies_p (x))
&& ! (MEM_IN_STRUCT_P (x) && rtx_addr_varies_p (x)
&& GET_MODE (x) != QImode
&& ! MEM_IN_STRUCT_P (mem) && ! rtx_addr_varies_p (mem))));
}
@ -769,8 +776,10 @@ output_dependence (mem, x)
|| (memrefs_conflict_p (SIZE_FOR_MODE (mem), XEXP (mem, 0),
SIZE_FOR_MODE (x), XEXP (x, 0), 0)
&& ! (MEM_IN_STRUCT_P (mem) && rtx_addr_varies_p (mem)
&& GET_MODE (mem) != QImode
&& ! MEM_IN_STRUCT_P (x) && ! rtx_addr_varies_p (x))
&& ! (MEM_IN_STRUCT_P (x) && rtx_addr_varies_p (x)
&& GET_MODE (x) != QImode
&& ! MEM_IN_STRUCT_P (mem) && ! rtx_addr_varies_p (mem))));
}