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rtlanal.c (rtx_addr_can_trap_p): Virtual registers cannot trap. 

* rtlanal.c (rtx_addr_can_trap_p): Virtual registers cannot trap.
        Auto-inc addresses trap only if their base register does.

From-SVN: r40914
This commit is contained in:
Richard Henderson 2001-03-27 23:34:51 -08:00 committed by Richard Henderson
parent 54590688b5
commit 4f73495e07
2 changed files with 22 additions and 5 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
2001-03-27 Richard Henderson <rth@redhat.com>
* rtlanal.c (rtx_addr_can_trap_p): Virtual registers cannot trap.
Auto-inc addresses trap only if their base register does.
* except.c (can_throw_internal): Rename from can_throw.
* except.h, resource.c: Update references.

24
gcc/rtlanal.c
View File

@ -216,10 +216,16 @@ rtx_addr_can_trap_p (x)
case REG:
/* As in rtx_varies_p, we have to use the actual rtx, not reg number. */
return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == stack_pointer_rtx
/* The arg pointer varies if it is not a fixed register. */
|| (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM]));
if (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
|| x == stack_pointer_rtx
/* The arg pointer varies if it is not a fixed register. */
|| (x == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM]))
return 0;
/* All of the virtual frame registers are stack references. */
if (REGNO (x) >= FIRST_VIRTUAL_REGISTER
&& REGNO (x) <= LAST_VIRTUAL_REGISTER)
return 0;
return 1;
case CONST:
return rtx_addr_can_trap_p (XEXP (x, 0));
@ -234,8 +240,16 @@ rtx_addr_can_trap_p (x)
&& CONSTANT_P (XEXP (x, 1))));
case LO_SUM:
case PRE_MODIFY:
return rtx_addr_can_trap_p (XEXP (x, 1));
case PRE_DEC:
case PRE_INC:
case POST_DEC:
case POST_INC:
case POST_MODIFY:
return rtx_addr_can_trap_p (XEXP (x, 0));
default:
break;
}