re PR rtl-optimization/61801 (sched2 miscompiles syscall sequence with -g)

2014-07-17  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/61801
	* sched-deps.c (sched_analyze_2): For ASM_OPERANDS and
	ASM_INPUT don't set reg_pending_barrier if it appears in a
	debug-insn.

From-SVN: r212738

gcc/ChangeLog

+2014-07-17  Richard Biener  <rguenther@suse.de>
+
+	PR rtl-optimization/61801
+	* sched-deps.c (sched_analyze_2): For ASM_OPERANDS and
+	ASM_INPUT don't set reg_pending_barrier if it appears in a
+	debug-insn.
+
 2014-07-16  DJ Delorie  <dj@redhat.com>
 
 	* config/rx/rx.c (rx_option_override): Fix alignment values.

gcc/sched-deps.c

@@ -2750,7 +2750,8 @@ sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn)
 	   Consider for instance a volatile asm that changes the fpu rounding
 	   mode.  An insn should not be moved across this even if it only uses
 	   pseudo-regs because it might give an incorrectly rounded result.  */
-	if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
+	if ((code != ASM_OPERANDS || MEM_VOLATILE_P (x))
+	    && !DEBUG_INSN_P (insn))
 	  reg_pending_barrier = TRUE_BARRIER;
 
 	/* For all ASM_OPERANDS, we must traverse the vector of input operands.