summaryrefslogtreecommitdiff
path: root/packages/gcc/gcc-4.3.1/debian/gcc-i386-emit-cld.dpatch
blob: 1267b00e18a3ccd5abd43d8751d4eead53d45faa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
#! /bin/sh -e

# DP: Emit cld instruction when stringops are used (i386).

dir=
if [ $# -eq 3 -a "$2" = '-d' ]; then
    pdir="-d $3"
    dir="$3/"
elif [ $# -ne 1 ]; then
    echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
    exit 1
fi
case "$1" in
    -patch)
        patch $pdir -f --no-backup-if-mismatch -p0 < $0
        ;;
    -unpatch)
        patch $pdir -f --no-backup-if-mismatch -R -p0 < $0
        ;;
    *)
        echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
        exit 1
esac
exit 0

2008-03-06  Uros Bizjak  <ubizjak@gmail.com>

	* config/i386/i386.h (TARGET_CLD): New define.
	(struct machine_function): Add needs_cld field.
	(ix86_current_function_needs_cld): New define.
	* config/i386/i386.md (UNSPEC_CLD): New unspec volatile constant.
	("cld"): New isns pattern.
	("strmov_singleop"): Set ix86_current_function_needs_cld flag.
	("rep_mov"): Ditto.
	("strset_singleop"): Ditto.
	("rep_stos"): Ditto.
	("cmpstrnqi_nz_1"): Ditto.
	("cmpstrnqi_1"): Ditto.
	("strlenqi_1"): Ditto.
	* config/i386/i386.c (ix86_expand_prologue): Emit cld insn for
	TARGET_CLD when ix86_current_function_needs_cld is set.

Index: gcc/config/i386/i386.h
===================================================================
--- gcc/config/i386/i386.h	(revision 132966)
+++ gcc/config/i386/i386.h	(working copy)
@@ -388,6 +388,7 @@ extern unsigned int ix86_arch_features[X
 
 extern int x86_prefetch_sse;
 
+#define TARGET_CLD		1
 #define TARGET_ABM		x86_abm
 #define TARGET_CMPXCHG16B	x86_cmpxchg16b
 #define TARGET_POPCNT		x86_popcnt
@@ -2446,8 +2447,9 @@ struct machine_function GTY(())
   int save_varrargs_registers;
   int accesses_prev_frame;
   int optimize_mode_switching[MAX_386_ENTITIES];
-  /* Set by ix86_compute_frame_layout and used by prologue/epilogue expander to
-     determine the style used.  */
+  int needs_cld;
+  /* Set by ix86_compute_frame_layout and used by prologue/epilogue
+     expander to determine the style used.  */
   int use_fast_prologue_epilogue;
   /* Number of saved registers USE_FAST_PROLOGUE_EPILOGUE has been computed
      for.  */
@@ -2467,6 +2469,7 @@ struct machine_function GTY(())
 #define ix86_stack_locals (cfun->machine->stack_locals)
 #define ix86_save_varrargs_registers (cfun->machine->save_varrargs_registers)
 #define ix86_optimize_mode_switching (cfun->machine->optimize_mode_switching)
+#define ix86_current_function_needs_cld (cfun->machine->needs_cld)
 #define ix86_tls_descriptor_calls_expanded_in_cfun \
   (cfun->machine->tls_descriptor_call_expanded_p)
 /* Since tls_descriptor_call_expanded is not cleared, even if all TLS
Index: gcc/config/i386/i386.md
===================================================================
--- gcc/config/i386/i386.md	(revision 132966)
+++ gcc/config/i386/i386.md	(working copy)
@@ -205,6 +205,7 @@
    (UNSPECV_XCHG		12)
    (UNSPECV_LOCK		13)
    (UNSPECV_PROLOGUE_USE	14)
+   (UNSPECV_CLD			15)
   ])
 
 ;; Constants to represent pcomtrue/pcomfalse variants
@@ -18519,6 +18520,14 @@
 
 ;; Block operation instructions
 
+(define_insn "cld"
+  [(unspec_volatile [(const_int 0)] UNSPECV_CLD)]
+  ""
+  "cld"
+  [(set_attr "length" "1")
+   (set_attr "length_immediate" "0")
+   (set_attr "modrm" "0")])
+
 (define_expand "movmemsi"
   [(use (match_operand:BLK 0 "memory_operand" ""))
    (use (match_operand:BLK 1 "memory_operand" ""))
@@ -18591,7 +18600,7 @@
 	      (set (match_operand 2 "register_operand" "")
 		   (match_operand 5 "" ""))])]
   "TARGET_SINGLE_STRINGOP || optimize_size"
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*strmovdi_rex_1"
   [(set (mem:DI (match_operand:DI 2 "register_operand" "0"))
@@ -18708,7 +18717,7 @@
 		   (match_operand 3 "memory_operand" ""))
 	      (use (match_dup 4))])]
   ""
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*rep_movdi_rex64"
   [(set (match_operand:DI 2 "register_operand" "=c") (const_int 0))
@@ -18868,7 +18877,7 @@
 	      (set (match_operand 0 "register_operand" "")
 		   (match_operand 3 "" ""))])]
   "TARGET_SINGLE_STRINGOP || optimize_size"
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*strsetdi_rex_1"
   [(set (mem:DI (match_operand:DI 1 "register_operand" "0"))
@@ -18962,7 +18971,7 @@
 	      (use (match_operand 3 "register_operand" ""))
 	      (use (match_dup 1))])]
   ""
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*rep_stosdi_rex64"
   [(set (match_operand:DI 1 "register_operand" "=c") (const_int 0))
@@ -19138,7 +19147,7 @@
 	      (clobber (match_operand 1 "register_operand" ""))
 	      (clobber (match_dup 2))])]
   ""
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*cmpstrnqi_nz_1"
   [(set (reg:CC FLAGS_REG)
@@ -19185,7 +19194,7 @@
 	      (clobber (match_operand 1 "register_operand" ""))
 	      (clobber (match_dup 2))])]
   ""
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*cmpstrnqi_1"
   [(set (reg:CC FLAGS_REG)
@@ -19254,7 +19263,7 @@
 	      (clobber (match_operand 1 "register_operand" ""))
 	      (clobber (reg:CC FLAGS_REG))])]
   ""
-  "")
+  "ix86_current_function_needs_cld = 1;")
 
 (define_insn "*strlenqi_1"
   [(set (match_operand:SI 0 "register_operand" "=&c")
Index: gcc/config/i386/i386.c
===================================================================
--- gcc/config/i386/i386.c	(revision 132966)
+++ gcc/config/i386/i386.c	(working copy)
@@ -6498,6 +6498,10 @@ ix86_expand_prologue (void)
 	emit_insn (gen_prologue_use (pic_offset_table_rtx));
       emit_insn (gen_blockage ());
     }
+
+  /* Emit cld instruction if stringops are used in the function.  */
+  if (TARGET_CLD && ix86_current_function_needs_cld)
+    emit_insn (gen_cld ());
 }
 
 /* Emit code to restore saved registers using MOV insns.  First register