gcse.c (store_killed_in_insn): Consider pure calls as potential store killers in addition to normal calls.

* gcse.c (store_killed_in_insn): Consider pure calls
	as potential store killers in addition to normal calls.

	* gcc.c-torture/execute/20011024-1.c: New test.

From-SVN: r47675
This commit is contained in:
Jakub Jelinek 2001-12-05 15:17:49 +01:00 committed by Jakub Jelinek
parent 7254c5fa73
commit 1218665b70
4 changed files with 43 additions and 1 deletions

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@ -1,3 +1,8 @@
2001-12-05 Jakub Jelinek <jakub@redhat.com>
* gcse.c (store_killed_in_insn): Consider pure calls
as potential store killers in addition to normal calls.
2001-12-05 Jakub Jelinek <jakub@redhat.com>
* expr.c (expand_expr): When checking promoted value, use

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@ -6498,8 +6498,21 @@ store_killed_in_insn (x, insn)
if (GET_CODE (insn) == CALL_INSN)
{
/* A normal or pure call might read from pattern,
but a const call will not. */
if (CONST_OR_PURE_CALL_P (insn))
return 0;
{
rtx link;
for (link = CALL_INSN_FUNCTION_USAGE (insn);
link;
link = XEXP (link, 1))
if (GET_CODE (XEXP (link, 0)) == USE
&& GET_CODE (XEXP (XEXP (link, 0), 0)) == MEM
&& GET_CODE (XEXP (XEXP (XEXP (link, 0), 0), 0)) == SCRATCH)
return 1;
return 0;
}
else
return 1;
}

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@ -6,6 +6,8 @@
* g++.dg/other/anon-union.C: New test.
* gcc.c-torture/execute/20011024-1.c: New test.
2001-12-04 Joseph S. Myers <jsm28@cam.ac.uk>
* gcc.c-torture/execute/20000722-1.x,

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@ -0,0 +1,22 @@
/* Test whether store motion recognizes pure functions as potentially reading
any memory. */
typedef __SIZE_TYPE__ size_t;
extern void *memcpy (void *dest, const void *src, size_t n);
extern size_t strlen (const char *s);
extern int strcmp (const char *s1, const char *s2) __attribute__((pure));
char buf[50];
static void foo (void)
{
if (memcpy (buf, "abc", 4) != buf) abort ();
if (strcmp (buf, "abc")) abort ();
memcpy (buf, "abcdefgh", strlen ("abcdefgh") + 1);
}
int main (void)
{
foo ();
return 0;
}