The RTL combiner will transform "if ((x & C) == C) goto label;"
into "if ((~x & C) == 0) goto label;" and will try to match it with
the insn patterns.
/* example */
void test_0(int a) {
if ((char)a == 255)
foo();
}
void test_1(int a) {
if ((unsigned short)a == 0xFFFF)
foo();
}
void test_2(int a) {
if ((a & 0x00003F80) != 0x00003F80)
foo();
}
;; before
test_0:
extui a2, a2, 0, 8
movi a3, 0xff
bne a2, a3, .L1
j.l foo, a9
.L1:
ret.n
test_1:
movi.n a3, -1
extui a2, a2, 0, 16
extui a3, a3, 16, 16
bne a2, a3, .L3
j.l foo, a9
.L3:
ret.n
test_2:
movi a3, 0x80
extui a2, a2, 7, 7
addmi a3, a3, 0x3f00
slli a2, a2, 7
beq a2, a3, .L5
j.l foo, a9
.L5:
ret.n
;; after
test_0:
movi a3, 0xff
bnall a2, a3, .L1
j.l foo, a9
.L1:
ret.n
test_1:
movi.n a3, -1
extui a3, a3, 16, 16
bnall a2, a3, .L3
j.l foo, a9
.L3:
ret.n
test_2:
movi a3, 0x80
addmi a3, a3, 0x3f00
ball a2, a3, .L5
j.l foo, a9
.L5:
ret.n
gcc/ChangeLog:
* config/xtensa/xtensa.md (*masktrue_const_bitcmpl):
Add a new insn_and_split pattern, and a few split patterns for
spacial cases.
---
gcc/config/xtensa/xtensa.md | 84 +++++++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index c02f1a56641..899ce2755aa 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -1714,6 +1714,90 @@
(set_attr "mode" "none")
(set_attr "length" "3")])
+(define_insn_and_split "*masktrue_const_bitcmpl"
+ [(set (pc)
+ (if_then_else (match_operator 3 "boolean_operator"
+ [(and:SI (not:SI (match_operand:SI 0 "register_operand"
"r"))
+ (match_operand:SI 1 "const_int_operand" "i"))
+ (const_int 0)])
+ (label_ref (match_operand 2 "" ""))
+ (pc)))]
+ "exact_log2 (INTVAL (operands[1])) < 0"
+ "#"
+ "&& can_create_pseudo_p ()"
+ [(set (match_dup 4)
+ (match_dup 1))
+ (set (pc)
+ (if_then_else (match_op_dup 3
+ [(and:SI (not:SI (match_dup 0))
+ (match_dup 4))
+ (const_int 0)])
+ (label_ref (match_dup 2))
+ (pc)))]
+{
+ operands[4] = gen_reg_rtx (SImode);
+}
+ [(set_attr "type" "jump")
+ (set_attr "mode" "none")
+ (set (attr "length")
+ (if_then_else (match_test "TARGET_DENSITY
+ && IN_RANGE (INTVAL (operands[1]), -32, 95)")
+ (const_int 5)
+ (if_then_else (match_test "xtensa_simm12b (INTVAL
(operands[1]))")
+ (const_int 6)
+ (const_int 10))))])
+
+(define_split
+ [(set (pc)
+ (if_then_else (match_operator 2 "boolean_operator"
+ [(subreg:HQI (not:SI (match_operand:SI 0
"register_operand")) 0)
+ (const_int 0)])
+ (label_ref (match_operand 1 ""))
+ (pc)))]
+ "!BYTES_BIG_ENDIAN"
+ [(set (pc)
+ (if_then_else (match_op_dup 2
+ [(and:SI (not:SI (match_dup 0))
+ (match_dup 3))
+ (const_int 0)])
+ (label_ref (match_dup 1))
+ (pc)))]
+{
+ operands[3] = GEN_INT ((1 << GET_MODE_BITSIZE (<MODE>mode)) - 1);
+})
+
+(define_split
+ [(set (pc)
+ (if_then_else (match_operator 2 "boolean_operator"
+ [(subreg:HI (not:SI (match_operand:SI 0
"register_operand")) 2)
+ (const_int 0)])
+ (label_ref (match_operand 1 ""))
+ (pc)))]
+ "BYTES_BIG_ENDIAN"
+ [(set (pc)
+ (if_then_else (match_op_dup 2
+ [(and:SI (not:SI (match_dup 0))
+ (const_int 65535))
+ (const_int 0)])
+ (label_ref (match_dup 1))
+ (pc)))])
+
+(define_split
+ [(set (pc)
+ (if_then_else (match_operator 2 "boolean_operator"
+ [(subreg:QI (not:SI (match_operand:SI 0
"register_operand")) 3)
+ (const_int 0)])
+ (label_ref (match_operand 1 ""))
+ (pc)))]
+ "BYTES_BIG_ENDIAN"
+ [(set (pc)
+ (if_then_else (match_op_dup 2
+ [(and:SI (not:SI (match_dup 0))
+ (const_int 255))
+ (const_int 0)])
+ (label_ref (match_dup 1))
+ (pc)))])
+
(define_insn_and_split "*masktrue_const_pow2_minus_one"
[(set (pc)
(if_then_else (match_operator 4 "boolean_operator"
--
2.20.1
