* PR 7409/Loop optimization bug patch
@ 2002-07-25 11:18 Hartmut Penner
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From: Hartmut Penner @ 2002-07-25 11:18 UTC (permalink / raw)
To: mark, gcc-patches; +Cc: uweigand
A proposed patch for problem described in PR7409 is appended here.
The problem was, that the usage of a register as a parameter was not taken
into acount in the function find_single_use_in_loop.
Index: loop.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/loop.c,v
retrieving revision 1.389.2.7
diff -u -r1.389.2.7 loop.c
--- loop.c 15 Jun 2002 01:12:04 -0000 1.389.2.7
+++ loop.c 25 Jul 2002 17:41:28 -0000
@@ -3448,6 +3448,19 @@
const char *fmt = GET_RTX_FORMAT (code);
int i, j;
+ if (x == PATTERN (insn) && GET_CODE (insn) == CALL_INSN)
+ {
+ rtx link;
+ for (link = CALL_INSN_FUNCTION_USAGE (insn); link; link = XEXP (link, 1))
+ {
+ rtx op, reg;
+
+ if (GET_CODE (op = XEXP (link, 0)) == USE
+ && GET_CODE (reg = XEXP (op, 0)) == REG)
+ regs->array[REGNO (reg)].single_usage = const0_rtx;
+ }
+ }
+
if (code == REG)
regs->array[REGNO (x)].single_usage
= (regs->array[REGNO (x)].single_usage != 0
Mit freundlichem Gruß / Best regards,
Hartmut Penner
GCC for S/390 Development
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