Here's a gcc 2.95.2 patch from the gcc-bug list which fixes a problem in
"long long" on i[345]86 (i686 was not affected).
Ben
--
-----------=======-=-======-=========-----------=====------------=-=------
/ Ben Collins -- ...on that fantastic voyage... -- Debian GNU/Linux \
` [EMAIL PROTECTED] -- [EMAIL PROTECTED] -- [EMAIL PROTECTED] '
`---=========------=======-------------=-=-----=-===-======-------=--=---'
Bernd
* reload1.c (conflicts_with_override): New function.
(emit_input_reload_insns): Use it to tighten test for validity
of substituting into output of previous insn.
Index: reload1.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/reload1.c,v
retrieving revision 1.241
diff -u -p -r1.241 reload1.c
--- reload1.c 2000/11/14 10:23:37 1.241
+++ reload1.c 2000/11/24 15:11:43
@@ -417,6 +417,7 @@ static int reload_reg_reaches_end_p PARA
enum reload_type));
static int allocate_reload_reg PARAMS ((struct insn_chain *, int,
int));
+static int conflicts_with_override PARAMS ((rtx));
static void failed_reload PARAMS ((rtx, int));
static int set_reload_reg PARAMS ((int, int));
static void choose_reload_regs_init PARAMS ((struct insn_chain *, rtx *));
@@ -4882,6 +4883,21 @@ reload_reg_free_for_value_p (regno, opnu
return 1;
}
+/* Determine whether the reload reg X overlaps any rtx'es used for
+ overriding inheritance. Return nonzero if so. */
+
+static int
+conflicts_with_override (x)
+ rtx x;
+{
+ int i;
+ for (i = 0; i < n_reloads; i++)
+ if (reload_override_in[i]
+ && reg_overlap_mentioned_p (x, reload_override_in[i]))
+ return 1;
+ return 0;
+}
+
/* Give an error message saying we failed to find a reload for INSN,
and clear out reload R. */
static void
@@ -6215,6 +6231,7 @@ emit_input_reload_insns (chain, rl, old,
&& dead_or_set_p (insn, old)
/* This is unsafe if some other reload
uses the same reg first. */
+ && ! conflicts_with_override (reloadreg)
&& reload_reg_free_for_value_p (REGNO (reloadreg),
rl->opnum,
rl->when_needed,
