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re PR rtl-optimization/46226 (asm goto may leave stack pointer invalid)

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PR rtl-opt/46226
* stmt.c (expand_asm_operands): Call do_pending_stack_adjust
for asm goto.

From-SVN: r166067
This commit is contained in:
Richard Henderson 2010-10-29 09:56:18 -07:00 committed by Richard Henderson
parent a9c64fcc1e
commit f802f27b85
3 changed files with 46 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2010-10-29 Richard Henderson <rth@redhat.com>
PR rtl-opt/46226
* stmt.c (expand_asm_operands): Call do_pending_stack_adjust
for asm goto.
2010-10-29 Paul Koning <ni1d@arrl.net>
* config/pdp11/pdp11.c (output_move_quad): Fix ICE for CPU

4
gcc/stmt.c
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@ -776,6 +776,10 @@ expand_asm_operands (tree string, tree outputs, tree inputs,
/* Second pass evaluates arguments. */
/* Make sure stack is consistent for asm goto. */
if (nlabels > 0)
do_pending_stack_adjust ();
ninout = 0;
for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
{

36
gcc/testsuite/gcc.dg/pr46226.c Normal file
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@ -0,0 +1,36 @@
/* { dg-do run } */
/* { dg-options "-Os -fomit-frame-pointer" } */
/* { dg-options "-Os -fomit-frame-pointer -mno-accumulate-outgoing-args -fno-asynchronous-unwind-tables" { target { i?86-*-* x86_64-*-* } } } */
extern void abort(void);
static void *p[2];
void __attribute__((noinline))
g(int x, ...)
{
asm volatile ("" : : "g"(x));
}
void __attribute__((noinline))
f(int x)
{
p[0] = __builtin_return_address (0);
if (x == 0)
g(0);
g(1, 2, 3, 4, 5, 6, 7);
asm goto ("jmp %l0" : : : : label);
abort ();
label:
p[1] = __builtin_return_address (0);
}
int main()
{
f(1);
if (p[0] != p[1])
abort ();
return 0;
}