@@ -1496,10 +1496,12 @@ dwarf2out_frame_debug_cfa_val_expression (rtx set)
update_row_reg_save (cur_row, dwf_regno (dest), cfi);
}
-/* A subroutine of dwarf2out_frame_debug, process a REG_CFA_RESTORE note. */
+/* A subroutine of dwarf2out_frame_debug, process a REG_CFA_RESTORE
+ note. When called with EMIT_CFI set to false emitting a CFI
+ statement is suppressed. */
static void
-dwarf2out_frame_debug_cfa_restore (rtx reg)
+dwarf2out_frame_debug_cfa_restore (rtx reg, bool emit_cfi)
{
gcc_assert (REG_P (reg));
@@ -1507,7 +1509,8 @@ dwarf2out_frame_debug_cfa_restore (rtx reg)
if (!span)
{
unsigned int regno = dwf_regno (reg);
- add_cfi_restore (regno);
+ if (emit_cfi)
+ add_cfi_restore (regno);
update_row_reg_save (cur_row, regno, NULL);
}
else
@@ -1522,7 +1525,8 @@ dwarf2out_frame_debug_cfa_restore (rtx reg)
reg = XVECEXP (span, 0, par_index);
gcc_assert (REG_P (reg));
unsigned int regno = dwf_regno (reg);
- add_cfi_restore (regno);
+ if (emit_cfi)
+ add_cfi_restore (regno);
update_row_reg_save (cur_row, regno, NULL);
}
}
@@ -2309,6 +2313,7 @@ dwarf2out_frame_debug (rtx_insn *insn)
break;
case REG_CFA_RESTORE:
+ case REG_CFA_NO_RESTORE:
n = XEXP (note, 0);
if (n == NULL)
{
@@ -2317,7 +2322,7 @@ dwarf2out_frame_debug (rtx_insn *insn)
n = XVECEXP (n, 0, 0);
n = XEXP (n, 0);
}
- dwarf2out_frame_debug_cfa_restore (n);
+ dwarf2out_frame_debug_cfa_restore (n, REG_NOTE_KIND (note) == REG_CFA_RESTORE);
handled_one = true;
break;
@@ -157,6 +157,11 @@ REG_CFA_NOTE (CFA_VAL_EXPRESSION)
first pattern is the register to be restored. */
REG_CFA_NOTE (CFA_RESTORE)
+/* Like CFA_RESTORE but without actually emitting CFI. This can be
+ used to tell the verification infrastructure that a register is
+ saved without intending to restore it. */
+REG_CFA_NOTE (CFA_NO_RESTORE)
+
/* Attached to insns that are RTX_FRAME_RELATED_P, marks insn that sets
vDRAP from DRAP. If vDRAP is a register, vdrap_reg is initalized
to the argument, if it is a MEM, it is ignored. */