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df-scan.c (df_get_call_refs): Mark global registers as both a DF_REF_REG_USE and a non-clobber DF_REF_REG_DEF.

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gcc/:

2007-10-22  Seongbae Park <seongbae.park@gmail.com>
	David S. Miller  <davem@davemloft.net>

	* df-scan.c (df_get_call_refs): Mark global registers as both a
	DF_REF_REG_USE and a non-clobber DF_REF_REG_DEF.

gcc/testsuite/:

2007-10-22  David S. Miller  <davem@davemloft.net>

	* gcc.dg/globalreg-1.c: New test.

From-SVN: r129573
This commit is contained in:
David S. Miller
2007-10-22 21:37:02 -07:00
parent eb1f867d0d
commit e237b8ddcc
4 changed files with 76 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@@ -1,3 +1,9 @@
2007-10-22 Seongbae Park <seongbae.park@gmail.com>
David S. Miller <davem@davemloft.net>
* df-scan.c (df_get_call_refs): Mark global registers as both a
DF_REF_REG_USE and a non-clobber DF_REF_REG_DEF.
2007-10-22 Richard Sandiford <rsandifo@nildram.co.uk>
PR target/33169

17
gcc/df-scan.c
View File

@@ -1584,12 +1584,19 @@ df_insn_refs_record (struct dataflow *dflow, basic_block bb, rtx insn)
so they are recorded as used. */
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i])
df_uses_record (dflow, &regno_reg_rtx[i],
DF_REF_REG_USE, bb, insn,
0);
{
df_uses_record (dflow, &regno_reg_rtx[i],
DF_REF_REG_USE, bb, insn, 0);
df_ref_record (dflow, regno_reg_rtx[i], &regno_reg_rtx[i],
bb, insn, DF_REF_REG_DEF, 0, true);
}
EXECUTE_IF_SET_IN_BITMAP (df_invalidated_by_call, 0, ui, bi)
df_ref_record (dflow, regno_reg_rtx[ui], &regno_reg_rtx[ui], bb,
insn, DF_REF_REG_DEF, DF_REF_MAY_CLOBBER, false);
{
if (!global_regs[ui])
df_ref_record (dflow, regno_reg_rtx[ui], &regno_reg_rtx[ui], bb,
insn, DF_REF_REG_DEF, DF_REF_MAY_CLOBBER, false);
}
}
}

4
gcc/testsuite/ChangeLog
View File

@@ -1,3 +1,7 @@
2007-10-22 David S. Miller <davem@davemloft.net>
* gcc.dg/globalreg-1.c: New test.
2007-10-18 Uros Bizjak <ubizjak@gmail.com>
PR target/32961

54
gcc/testsuite/gcc.dg/globalreg-1.c Normal file
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@@ -0,0 +1,54 @@
/* { dg-do run { target sparc*-*-* } } */
/* { dg-options "-std=gnu99 -Os" } */
/* This is a massively distilled test case based upon
mm/memory.c:unmap_vmas() in the Linux kernel when compiled
on sparc64 for SMP which uses a global register as the
base of the per-cpu variable area.
Because of a bug in global register handling in the dataflow
code, the loop-invariant pass would move 'expression(regval)'
outside of the loop. */
extern void exit(int);
extern void abort(void);
register unsigned long regval __asm__("g6");
extern void cond_resched(void);
unsigned int var;
static unsigned long expression(unsigned long v)
{
unsigned long ret;
__asm__("" : "=r" (ret) : "0" (0));
return ret + v;
}
void func(unsigned long *pp)
{
int i;
for (i = 0; i < 56; i++) {
cond_resched();
*pp = expression(regval);
}
}
void __attribute__((noinline)) cond_resched(void)
{
regval++;
}
int main(void)
{
unsigned long val;
regval = 100;
func(&val);
if (val != 156)
abort();
exit(0);
}