A move/bstrins pair is as fast as a (addi.w|lu12i.w|lu32i.d|lu52i.d)/and
pair, and twice fast as a srli/slli pair. When the src reg and the dst
reg happens to be the same, the move instruction can be optimized away.
gcc/ChangeLog:
* config/loongarch/predicates.md (high_bitmask_operand): New
predicate.
* config/loongarch/constraints.md (Yy): New constriant.
* config/loongarch/loongarch.md (and<mode>3_align): New
define_insn_and_split.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/bstrins-1.c: New test.
* gcc.target/loongarch/bstrins-2.c: New test.
---
Bootstrapped and regtested on loongarch64-linux-gnu. Ok for trunk?
gcc/config/loongarch/constraints.md | 5 +++++
gcc/config/loongarch/loongarch.md | 17 +++++++++++++++++
gcc/config/loongarch/predicates.md | 4 ++++
gcc/testsuite/gcc.target/loongarch/bstrins-1.c | 9 +++++++++
gcc/testsuite/gcc.target/loongarch/bstrins-2.c | 14 ++++++++++++++
5 files changed, 49 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/loongarch/bstrins-1.c
create mode 100644 gcc/testsuite/gcc.target/loongarch/bstrins-2.c
diff --git a/gcc/config/loongarch/constraints.md
b/gcc/config/loongarch/constraints.md
index f07d31650d2..12cf5e2924a 100644
--- a/gcc/config/loongarch/constraints.md
+++ b/gcc/config/loongarch/constraints.md
@@ -94,6 +94,7 @@
;; "A constant @code{move_operand} that can be safely loaded using
;; @code{la}."
;; "Yx"
+;; "Yy"
;; "Z" -
;; "ZC"
;; "A memory operand whose address is formed by a base register and offset
@@ -291,6 +292,10 @@ (define_constraint "Yx"
"@internal"
(match_operand 0 "low_bitmask_operand"))
+(define_constraint "Yy"
+ "@internal"
+ (match_operand 0 "high_bitmask_operand"))
+
(define_constraint "YI"
"@internal
A replicated vector const in which the replicated value is in the range
diff --git a/gcc/config/loongarch/loongarch.md
b/gcc/config/loongarch/loongarch.md
index 5c80c169cbf..25c1d323ba0 100644
--- a/gcc/config/loongarch/loongarch.md
+++ b/gcc/config/loongarch/loongarch.md
@@ -1542,6 +1542,23 @@ (define_insn "and<mode>3_extended"
[(set_attr "move_type" "pick_ins")
(set_attr "mode" "<MODE>")])
+(define_insn_and_split "and<mode>3_align"
+ [(set (match_operand:GPR 0 "register_operand" "=r")
+ (and:GPR (match_operand:GPR 1 "register_operand" "r")
+ (match_operand:GPR 2 "high_bitmask_operand" "Yy")))]
+ ""
+ "#"
+ ""
+ [(set (match_dup 0) (match_dup 1))
+ (set (zero_extract:GPR (match_dup 0) (match_dup 2) (const_int 0))
+ (const_int 0))]
+{
+ int len;
+
+ len = low_bitmask_len (<MODE>mode, ~INTVAL (operands[2]));
+ operands[2] = GEN_INT (len);
+})
+
(define_insn_and_split "*bstrins_<mode>_for_mask"
[(set (match_operand:GPR 0 "register_operand" "=r")
(and:GPR (match_operand:GPR 1 "register_operand" "r")
diff --git a/gcc/config/loongarch/predicates.md
b/gcc/config/loongarch/predicates.md
index eba7f246c84..58e406ea522 100644
--- a/gcc/config/loongarch/predicates.md
+++ b/gcc/config/loongarch/predicates.md
@@ -293,6 +293,10 @@ (define_predicate "low_bitmask_operand"
(and (match_code "const_int")
(match_test "low_bitmask_len (mode, INTVAL (op)) > 12")))
+(define_predicate "high_bitmask_operand"
+ (and (match_code "const_int")
+ (match_test "low_bitmask_len (mode, ~INTVAL (op)) > 0")))
+
(define_predicate "d_operand"
(and (match_code "reg")
(match_test "GP_REG_P (REGNO (op))")))
diff --git a/gcc/testsuite/gcc.target/loongarch/bstrins-1.c
b/gcc/testsuite/gcc.target/loongarch/bstrins-1.c
new file mode 100644
index 00000000000..7cb3a952322
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/bstrins-1.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=loongarch64 -mabi=lp64d" } */
+/* { dg-final { scan-assembler "bstrins\\.d\t\\\$r4,\\\$r0,4,0" } } */
+
+long
+x (long a)
+{
+ return a & -32;
+}
diff --git a/gcc/testsuite/gcc.target/loongarch/bstrins-2.c
b/gcc/testsuite/gcc.target/loongarch/bstrins-2.c
new file mode 100644
index 00000000000..9777f502e5a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/bstrins-2.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=loongarch64 -mabi=lp64d" } */
+/* { dg-final { scan-assembler "bstrins\\.d\t\\\$r\[0-9\]+,\\\$r0,4,0" } } */
+
+struct aligned_buffer {
+ _Alignas(32) char x[1024];
+};
+
+extern int f(char *);
+int g(void)
+{
+ struct aligned_buffer buf;
+ return f(buf.x);
+}
--
2.45.2
