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author | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-12-16 19:00:57 +0000 |
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committer | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-12-16 19:00:57 +0000 |
commit | 8faee5397ccc16a55c7ef987653c0361821bc85d (patch) | |
tree | a9e92ed8d4dcc8862d2338c0e826b01bf139a898 /gcc/genattrtab.c | |
parent | b63957b3fffaa796d62c12b9d0c2273923207c2a (diff) | |
download | gcc-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.c | 59 |
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: |