This patch introduces a bit_optab iterator that maps IOR/XOR to bset and
binv (and one day bclr if we need it). That allows us to combine some
patterns that only differed in the RTL opcode (IOR vs XOR) and in the
name/assembly (bset vs binv).
Additionally this also allow us to use the iterator in the
bset<mode>mask and bsetidisi patterns thus potentially fixing a missed
optimization.
This has gone through my tester. I'll wait for a verdict from
pre-commit CI before moving forward.
Jeff
diff --git a/gcc/config/riscv/bitmanip.md b/gcc/config/riscv/bitmanip.md
index ae5e7e510c0..17a036bdb60 100644
--- a/gcc/config/riscv/bitmanip.md
+++ b/gcc/config/riscv/bitmanip.md
@@ -569,22 +569,22 @@ (define_insn_and_split "*minmax"
;; ZBS extension.
-(define_insn "*bset<mode>"
+(define_insn "*<bit_optab><mode>"
[(set (match_operand:X 0 "register_operand" "=r")
- (ior:X (ashift:X (const_int 1)
- (match_operand:QI 2 "register_operand" "r"))
- (match_operand:X 1 "register_operand" "r")))]
+ (any_or:X (ashift:X (const_int 1)
+ (match_operand:QI 2 "register_operand" "r"))
+ (match_operand:X 1 "register_operand" "r")))]
"TARGET_ZBS"
- "bset\t%0,%1,%2"
+ "<bit_optab>\t%0,%1,%2"
[(set_attr "type" "bitmanip")])
-(define_insn "*bset<mode>_mask"
+(define_insn "*<bit_optab><mode>_mask"
[(set (match_operand:X 0 "register_operand" "=r")
- (ior:X (ashift:X (const_int 1)
- (subreg:QI
- (and:X (match_operand:X 2 "register_operand" "r")
- (match_operand 3 "<X:shiftm1>"
"<X:shiftm1p>")) 0))
- (match_operand:X 1 "register_operand" "r")))]
+ (any_or:X (ashift:X (const_int 1)
+ (subreg:QI
+ (and:X (match_operand:X 2 "register_operand" "r")
+ (match_operand 3 "<X:shiftm1>"
"<X:shiftm1p>")) 0))
+ (match_operand:X 1 "register_operand" "r")))]
"TARGET_ZBS"
"bset\t%0,%1,%2"
[(set_attr "type" "bitmanip")])
@@ -655,24 +655,24 @@ (define_insn "*bset<mode>_1_mask"
"bset\t%0,x0,%1"
[(set_attr "type" "bitmanip")])
-(define_insn "*bseti<mode>"
+(define_insn "*<bit_optab>i<mode>"
[(set (match_operand:X 0 "register_operand" "=r")
- (ior:X (match_operand:X 1 "register_operand" "r")
- (match_operand:X 2 "single_bit_mask_operand" "DbS")))]
+ (any_or:X (match_operand:X 1 "register_operand" "r")
+ (match_operand:X 2 "single_bit_mask_operand" "DbS")))]
"TARGET_ZBS"
- "bseti\t%0,%1,%S2"
+ "<bit_optab>i\t%0,%1,%S2"
[(set_attr "type" "bitmanip")])
;; As long as the SImode operand is not a partial subreg, we can use a
;; bseti without postprocessing, as the middle end is smart enough to
;; stay away from the signbit.
-(define_insn "*bsetidisi"
+(define_insn "*<bit_optab>idisi"
[(set (match_operand:DI 0 "register_operand" "=r")
- (ior:DI (sign_extend:DI (match_operand:SI 1 "register_operand" "r"))
- (match_operand 2 "single_bit_mask_operand" "i")))]
+ (any_or:DI (sign_extend:DI (match_operand:SI 1 "register_operand" "r"))
+ (match_operand 2 "single_bit_mask_operand" "i")))]
"TARGET_ZBS && TARGET_64BIT
&& !partial_subreg_p (operands[1])"
- "bseti\t%0,%1,%S2"
+ "<bit_optab>i\t%0,%1,%S2"
[(set_attr "type" "bitmanip")])
;; We can easily handle zero extensions
@@ -781,23 +781,6 @@ (define_split
(and:DI (rotate:DI (const_int -2) (match_dup 1))
(match_dup 3)))])
-(define_insn "*binv<mode>"
- [(set (match_operand:X 0 "register_operand" "=r")
- (xor:X (ashift:X (const_int 1)
- (match_operand:QI 2 "register_operand" "r"))
- (match_operand:X 1 "register_operand" "r")))]
- "TARGET_ZBS"
- "binv\t%0,%1,%2"
- [(set_attr "type" "bitmanip")])
-
-(define_insn "*binvi<mode>"
- [(set (match_operand:X 0 "register_operand" "=r")
- (xor:X (match_operand:X 1 "register_operand" "r")
- (match_operand:X 2 "single_bit_mask_operand" "DbS")))]
- "TARGET_ZBS"
- "binvi\t%0,%1,%S2"
- [(set_attr "type" "bitmanip")])
-
(define_insn "*bext<mode>"
[(set (match_operand:X 0 "register_operand" "=r")
(zero_extract:X (match_operand:X 1 "register_operand" "r")
diff --git a/gcc/config/riscv/iterators.md b/gcc/config/riscv/iterators.md
index 1e37e843023..20745faa55e 100644
--- a/gcc/config/riscv/iterators.md
+++ b/gcc/config/riscv/iterators.md
@@ -275,6 +275,9 @@ (define_code_attr optab [(ashift "ashl")
(fix "fix_trunc")
(unsigned_fix "fixuns_trunc")])
+(define_code_attr bit_optab [(ior "bset")
+ (xor "binv")])
+
;; <or_optab> code attributes
(define_code_attr or_optab [(ior "ior")
(xor "xor")])
