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alias.c: Update comments for ADDRESS.

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* alias.c: Update comments for ADDRESS.
        (nonlocal_reference_p): Look inside the ADDRESS to determine if
        it is a local memory reference.

From-SVN: r30210
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Jeffrey A Law 1999-10-27 06:18:11 +00:00 • committed by Jeff Law
parent c831fdea4b
commit b3b5ad95e6
2 changed files with 27 additions and 8 deletions
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gcc/ChangeLog
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@ -4,6 +4,10 @@ Tue Oct 26 23:15:03 1999 Mark Mitchell <mark@codesourcery.com>
Tue Oct 26 23:29:18 1999 Jeffrey A Law (law@cygnus.com)
* alias.c: Update comments for ADDRESS.
(nonlocal_reference_p): Look inside the ADDRESS to determine if
it is a local memory reference.
* c-typeck.c (build_function_call): Check that the built-in
function is of class BUILT_IN_NORMAL before trying to recongize
it as BUILT_IN_ABS.

31
gcc/alias.c
View file

@ -121,12 +121,16 @@ static int nonlocal_reference_p PROTO((rtx));
A base address can be an ADDRESS, SYMBOL_REF, or LABEL_REF. ADDRESS
expressions represent certain special values: function arguments and
the stack, frame, and argument pointers. The contents of an address
expression are not used (but they are descriptive for debugging);
only the address and mode matter. Pointer equality, not rtx_equal_p,
determines whether two ADDRESS expressions refer to the same base
address. The mode determines whether it is a function argument or
other special value. */
the stack, frame, and argument pointers.
The contents of an ADDRESS is not normally used, the mode of the
ADDRESS determines whether the ADDRESS is a function argument or some
other special value. Pointer equality, not rtx_equal_p, determines whether
two ADDRESS expressions refer to the same base address.
The only use of the contents of an ADDRESS is for determining if the
current function performs nonlocal memory memory references for the
purposes of marking the function as a constant function. */
static rtx *reg_base_value;
static rtx *new_reg_base_value;
@ -1422,8 +1426,19 @@ nonlocal_reference_p (x)
base = find_base_term (XEXP (x, 0));
if (base)
{
/* Stack references are local. */
if (GET_CODE (base) == ADDRESS && GET_MODE (base) == Pmode)
/* A Pmode ADDRESS could be a reference via the structure value
address or static chain. Such memory references are nonlocal.
Thus, we have to examine the contents of the ADDRESS to find
out if this is a local reference or not. */
if (GET_CODE (base) == ADDRESS
&& GET_MODE (base) == Pmode
&& (XEXP (base, 0) == stack_pointer_rtx
|| XEXP (base, 0) == arg_pointer_rtx
#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
|| XEXP (base, 0) == hard_frame_pointer_rtx
#endif
|| XEXP (base, 0) == frame_pointer_rtx))
return 0;
/* Constants in the function's constant pool are constant. */
if (GET_CODE (base) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (base))