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re PR inline-asm/11676 (operand to volatile asm incorrectly removed)

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PR inline-asm/11676
        * cse.c (count_reg_usage): Handle asm_operands properly.

From-SVN: r69816
This commit is contained in:
Richard Henderson 2003-07-26 08:53:14 -07:00 committed by Richard Henderson
parent cd65f08202
commit a6c14a644c
4 changed files with 48 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-07-26 Richard Henderson <rth@redhat.com>
PR inline-asm/11676
* cse.c (count_reg_usage): Handle asm_operands properly.
2003-07-26 Roger Sayle <roger@eyesopen.com>
* builtins.def (DEF_FALLBACK_BUILTIN): Delete.

10
gcc/cse.c
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@ -7384,6 +7384,16 @@ count_reg_usage (rtx x, int *counts, rtx dest, int incr)
count_reg_usage (XEXP (x, 1), counts, NULL_RTX, incr);
return;
case ASM_OPERANDS:
/* If the asm is volatile, then this insn cannot be deleted,
and so the inputs *must* be live. */
if (MEM_VOLATILE_P (x))
dest = NULL_RTX;
/* Iterate over just the inputs, not the constraints as well. */
for (i = ASM_OPERANDS_INPUT_LENGTH (x) - 1; i >= 0; i--)
count_reg_usage (ASM_OPERANDS_INPUT (x, i), counts, dest, incr);
return;
case INSN_LIST:
abort ();

9
gcc/testsuite/gcc.dg/asm-8.c Normal file
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@ -0,0 +1,9 @@
/* PR inline-asm/11676 */
/* { dg-do compile } */
/* { dg-options "-O -Wall" } */
void foo(void)
{
long x = 0;
asm volatile ("" : "=r"(x) : "r"(x)); /* { dg-bogus "uninitialized" } */
}

24
gcc/testsuite/gcc.dg/i386-asm-1.c Normal file
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@ -0,0 +1,24 @@
/* PR inline-asm/11676 */
/* { dg-do run { target i?86-*-* } } */
/* { dg-options "-O2" } */
static int bar(int x) __asm__("bar");
static int __attribute__((regparm(1), noinline, used))
bar(int x)
{
if (x != 0)
abort ();
}
static int __attribute__((regparm(1), noinline))
foo(int x)
{
x = 0;
__asm__ __volatile__("call bar" : "=a"(x) : "a"(x));
}
int main()
{
foo(1);
return 0;
}