PR rtl-optimization/15139
* combine.c: Include params.h.
(count_rtxs): New function.
(record_value_for_reg): If replace_rtx would replace at least
2 occurrences of REG in VALUE and TEM is really large, replace REG with
(clobber (const_int 0)) instead of TEM.
* params.def (PARAM_MAX_LAST_VALUE_RTL): New.
* params.h (MAX_LAST_VALUE_RTL): New.
* Makefile.in (combine.o): Depend on $(PARAMS_H).
* doc/invoke.texi (--param max-last-value-rtl=N): Document.
* gcc.dg/
20050111-2.c: New test.
From-SVN: r93892
2005-01-19 Jakub Jelinek <jakub@redhat.com>
+ PR rtl-optimization/15139
+ * combine.c: Include params.h.
+ (count_rtxs): New function.
+ (record_value_for_reg): If replace_rtx would replace at least
+ 2 occurrences of REG in VALUE and TEM is really large, replace REG with
+ (clobber (const_int 0)) instead of TEM.
+ * params.def (PARAM_MAX_LAST_VALUE_RTL): New.
+ * params.h (MAX_LAST_VALUE_RTL): New.
+ * Makefile.in (combine.o): Depend on $(PARAMS_H).
+ * doc/invoke.texi (--param max-last-value-rtl=N): Document.
+
PR c/17297
* c-typeck.c (digest_init): Only call build_vector if all constructor
elements are *_CST nodes.
combine.o : combine.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
$(FLAGS_H) function.h insn-config.h $(INSN_ATTR_H) $(REGS_H) $(EXPR_H) \
rtlhooks-def.h $(BASIC_BLOCK_H) $(RECOG_H) real.h hard-reg-set.h \
- toplev.h $(TM_P_H) $(TREE_H) $(TARGET_H) output.h
+ toplev.h $(TM_P_H) $(TREE_H) $(TARGET_H) output.h $(PARAMS_H)
regclass.o : regclass.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
hard-reg-set.h $(FLAGS_H) $(BASIC_BLOCK_H) $(REGS_H) insn-config.h \
$(RECOG_H) reload.h real.h toplev.h function.h output.h $(GGC_H) \
#include "rtlhooks-def.h"
/* Include output.h for dump_file. */
#include "output.h"
+#include "params.h"
/* Number of attempts to combine instructions in this function. */
return gen_binary (reversed_code, mode, op0, op1);
}
\f
+/* Utility function for record_value_for_reg. Count number of
+ rtxs in X. */
+static int
+count_rtxs (rtx x)
+{
+ enum rtx_code code = GET_CODE (x);
+ const char *fmt;
+ int i, ret = 1;
+
+ if (GET_RTX_CLASS (code) == '2'
+ || GET_RTX_CLASS (code) == 'c')
+ {
+ rtx x0 = XEXP (x, 0);
+ rtx x1 = XEXP (x, 1);
+
+ if (x0 == x1)
+ return 1 + 2 * count_rtxs (x0);
+
+ if ((GET_RTX_CLASS (GET_CODE (x1)) == '2'
+ || GET_RTX_CLASS (GET_CODE (x1)) == 'c')
+ && (x0 == XEXP (x1, 0) || x0 == XEXP (x1, 1)))
+ return 2 + 2 * count_rtxs (x0)
+ + count_rtxs (x == XEXP (x1, 0)
+ ? XEXP (x1, 1) : XEXP (x1, 0));
+
+ if ((GET_RTX_CLASS (GET_CODE (x0)) == '2'
+ || GET_RTX_CLASS (GET_CODE (x0)) == 'c')
+ && (x1 == XEXP (x0, 0) || x1 == XEXP (x0, 1)))
+ return 2 + 2 * count_rtxs (x1)
+ + count_rtxs (x == XEXP (x0, 0)
+ ? XEXP (x0, 1) : XEXP (x0, 0));
+ }
+
+ fmt = GET_RTX_FORMAT (code);
+ for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+ if (fmt[i] == 'e')
+ ret += count_rtxs (XEXP (x, i));
+
+ return ret;
+}
+\f
/* Utility function for following routine. Called when X is part of a value
being stored into last_set_value. Sets last_set_table_tick
for each register mentioned. Similar to mention_regs in cse.c */
&& GET_CODE (XEXP (tem, 0)) == CLOBBER
&& GET_CODE (XEXP (tem, 1)) == CLOBBER)
tem = XEXP (tem, 0);
+ else if (count_occurrences (value, reg, 1) >= 2)
+ {
+ /* If there are two or more occurrences of REG in VALUE,
+ prevent the value from growing too much. */
+ if (count_rtxs (tem) > MAX_LAST_VALUE_RTL)
+ tem = gen_rtx_CLOBBER (GET_MODE (tem), const0_rtx);
+ }
value = replace_rtx (copy_rtx (value), reg, tem);
}
The maximum number of insns in a region to be considered for
interblock scheduling. The default value is 100.
+@item max-last-value-rtl
+
+The maximum size measured as number of RTLs that can be recorded in an expression
+in combiner for a pseudo register as last known value of that register. The default
+is 10000.
+
@item integer-share-limit
Small integer constants can use a shared data structure, reducing the
compiler's memory usage and increasing its speed. This sets the maximum
"The maximum number of insns in a region to be considered for interblock scheduling",
100, 0, 0)
+DEFPARAM(PARAM_MAX_LAST_VALUE_RTL,
+ "max-last-value-rtl",
+ "The maximum number of RTL nodes that can be recorded as combiner's last value",
+ 10000, 0, 0)
+
/* INTEGER_CST nodes are shared for values [{-1,0} .. N) for
{signed,unsigned} integral types. This determines N.
Experimentation shows 256 to be a good value. */
PARAM_VALUE (PARAM_MAX_ALIASED_VOPS)
#define INTEGER_SHARE_LIMIT \
PARAM_VALUE (PARAM_INTEGER_SHARE_LIMIT)
+#define MAX_LAST_VALUE_RTL \
+ PARAM_VALUE (PARAM_MAX_LAST_VALUE_RTL)
#endif /* ! GCC_PARAMS_H */
2005-01-19 Jakub Jelinek <jakub@redhat.com>
+ PR rtl-optimization/15139
+ * gcc.dg/20050111-2.c: New test.
+
PR c/17297
* gcc.c-torture/compile/20050113-1.c: New testcase.
--- /dev/null
+/* PR rtl-optimization/15139 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -funroll-loops" } */
+
+void
+foo (double **a, double **z)
+{
+ long int i, j;
+ double d = -1.0;
+
+ for (i = 0; i < 6; i++)
+ for (j = 0; j < 5; j++)
+ d = z[i][j] > d ? z[i][j] : d;
+
+ for (i = 0; i < 6; i++)
+ for (j = 0; j < 5; j++)
+ z[i][j] /= d;
+
+ for (i = 0; i < 5; i++)
+ a[i][j] = z[i][j];
+}