https://gcc.gnu.org/g:23e7e8c94fe6a0385d15503d878bfb75c718eb14
commit 23e7e8c94fe6a0385d15503d878bfb75c718eb14
Author: Jeff Law <j...@ventanamicro.com>
Date: Thu Jun 20 08:43:37 2024 -0600
[RISC-V] Minor cleanup/improvement to bset/binv patterns
Changes since V1:
Whitespace fixes noted by the linter
Missed using the iterator for the output template in
<bit_optab><mode>_mask pattern!
--
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.
gcc/
* config/riscv/bitmanip.md (<bit_optab><mode>): New unified
pattern for bset/binv using a code iterator.
(<bit_optab>i<mode>): Likewise.
(<bit_optab><mode>_mask): Likewise. Support XOR via any_or.
(<bit_optab>isidi): Likewise.
* config/riscv/iterators.md (bit_optab): New iterator.
(cherry picked from commit f739ad5e35b0a60dec65bb12f8d07aadd0c98196)
Diff:
---
gcc/config/riscv/bitmanip.md | 59 ++++++++++++++++---------------------------
gcc/config/riscv/iterators.md | 3 +++
2 files changed, 25 insertions(+), 37 deletions(-)
diff --git a/gcc/config/riscv/bitmanip.md b/gcc/config/riscv/bitmanip.md
index ae5e7e510c0..3eedabffca0 100644
--- a/gcc/config/riscv/bitmanip.md
+++ b/gcc/config/riscv/bitmanip.md
@@ -569,24 +569,26 @@
;; 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"
+ "<bit_optab>\t%0,%1,%2"
[(set_attr "type" "bitmanip")])
(define_insn "*bset<mode>_1"
@@ -655,24 +657,24 @@
"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 +783,6 @@
(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 @@
(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")])
