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authorhubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4>2000-12-16 19:00:57 +0000
committerhubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4>2000-12-16 19:00:57 +0000
commit8faee5397ccc16a55c7ef987653c0361821bc85d (patch)
treea9e92ed8d4dcc8862d2338c0e826b01bf139a898 /gcc/genattrtab.c
parentb63957b3fffaa796d62c12b9d0c2273923207c2a (diff)
downloadgcc-8faee5397ccc16a55c7ef987653c0361821bc85d.tar.gz
* i386.md (ashrsi3_cmpno, ashrhi3_cmpno, ashrqi3_cmpno, lshrsi3_cmpno,
lshrhi3_cmpno): Remove redundant '@' from the template. * i386.md (cmpstrsi_1): Fix type of the compare. * genattrtab.c (attr_rtx_cost): New function. (simplify_test_exp): Avoid overactive inlining; use temporary obstacks for tests. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@38310 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/genattrtab.c')
-rw-r--r--gcc/genattrtab.c59
1 files changed, 58 insertions, 1 deletions
diff --git a/gcc/genattrtab.c b/gcc/genattrtab.c
index 98b11256610..c69ad537696 100644
--- a/gcc/genattrtab.c
+++ b/gcc/genattrtab.c
@@ -460,6 +460,7 @@ static rtx attr_eq PARAMS ((const char *, const char *));
static const char *attr_numeral PARAMS ((int));
static int attr_equal_p PARAMS ((rtx, rtx));
static rtx attr_copy_rtx PARAMS ((rtx));
+static int attr_rtx_cost PARAMS ((rtx));
#define oballoc(size) obstack_alloc (hash_obstack, size)
@@ -3151,6 +3152,53 @@ simplify_or_tree (exp, pterm, insn_code, insn_index)
return exp;
}
+/* Compute approximate cost of the expression. Used to decide whether
+ expression is cheap enought for inline. */
+static int
+attr_rtx_cost (x)
+ rtx x;
+{
+ int cost = 0;
+ enum rtx_code code;
+ if (!x)
+ return 0;
+ code = GET_CODE (x);
+ switch (code)
+ {
+ case MATCH_OPERAND:
+ if (XSTR (x, 1)[0])
+ return 10;
+ else
+ return 0;
+ case EQ_ATTR:
+ /* Alternatives don't result into function call. */
+ if (!strcmp (XSTR (x, 0), "alternative"))
+ return 0;
+ else
+ return 5;
+ default:
+ {
+ int i, j;
+ const char *fmt = GET_RTX_FORMAT (code);
+ for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+ {
+ switch (fmt[i])
+ {
+ case 'V':
+ case 'E':
+ for (j = 0; j < XVECLEN (x, i); j++)
+ cost += attr_rtx_cost (XVECEXP (x, i, j));
+ break;
+ case 'e':
+ cost += attr_rtx_cost (XEXP (x, i));
+ break;
+ }
+ }
+ }
+ break;
+ }
+ return cost;
+}
/* Given an expression, see if it can be simplified for a particular insn
code based on the values of other attributes being tested. This can
@@ -3407,7 +3455,16 @@ simplify_test_exp (exp, insn_code, insn_index)
for (av = attr->first_value; av; av = av->next)
for (ie = av->first_insn; ie; ie = ie->next)
if (ie->insn_code == insn_code)
- return evaluate_eq_attr (exp, av->value, insn_code, insn_index);
+ {
+ rtx x;
+ struct obstack *old = rtl_obstack;
+ rtl_obstack = temp_obstack;
+ x = evaluate_eq_attr (exp, av->value, insn_code, insn_index);
+ x = SIMPLIFY_TEST_EXP (x, insn_code, insn_index);
+ rtl_obstack = old;
+ if (attr_rtx_cost(x) < 20)
+ return attr_copy_rtx (x);
+ }
break;
default: