Following testcase:
struct S1
{
unsigned char val;
unsigned char pad1;
unsigned short pad2;
};
struct S2
{
unsigned char pad1;
unsigned char val;
unsigned short pad2;
};
struct S1 test_and (struct S1 a, struct S2 b)
{
a.val &= b.val;
return a;
}
compiles with -O2 to:
movl %esi, %edx
movl %edi, %eax
movzbl %dh, %esi
andb %sil, %al
ANDB could use high register %dh instead of %sil:
movl %edi, %eax
movl %esi, %edx
andb %dh, %al
Patch introduces strict_low_part QImode insn patterns with one of
its input arguments extracted from high register.
PR target/78904
gcc/ChangeLog:
* config/i386/i386.md (*addqi_ext<mode>_1_slp):
New define_insn_and_split pattern.
(*subqi_ext<mode>_1_slp): Ditto.
(*<any_logic:code>qi_ext<mode>_1_slp): Ditto.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr78904-7.c: New test.
* gcc.target/i386/pr78904-7a.c: New test.
* gcc.target/i386/pr78904-7b.c: New test.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Uros.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 84cc50c7bb2..6136e46b1bc 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -6615,6 +6615,36 @@ (define_insn_and_split "*add<mode>_1_slp"
(const_string "alu")))
(set_attr "mode" "<MODE>")])
+;; Alternative 1 is needed to work around LRA limitation, see PR82524.
+(define_insn_and_split "*addqi_ext<mode>_1_slp"
+ [(set (strict_low_part (match_operand:QI 0 "register_operand" "+Q,&Q"))
+ (plus:QI
+ (subreg:QI
+ (match_operator:SWI248 3 "extract_operator"
+ [(match_operand 2 "int248_register_operand" "Q,Q")
+ (const_int 8)
+ (const_int 8)]) 0)
+ (match_operand:QI 1 "nonimmediate_operand" "0,!Q")))
+ (clobber (reg:CC FLAGS_REG))]
+ ""
+ "@
+ add{b}\t{%h2, %0|%0, %h2}
+ #"
+ "reload_completed
+ && !rtx_equal_p (operands[0], operands[1])"
+ [(set (strict_low_part (match_dup 0)) (match_dup 1))
+ (parallel
+ [(set (strict_low_part (match_dup 0))
+ (plus:QI
+ (subreg:QI
+ (match_op_dup 3
+ [(match_dup 0) (const_int 8) (const_int 8)]) 0)
+ (match_dup 1)))
+ (clobber (reg:CC FLAGS_REG))])]
+ ""
+ [(set_attr "type" "alu")
+ (set_attr "mode" "QI")])
+
;; Split non destructive adds if we cannot use lea.
(define_split
[(set (match_operand:SWI48 0 "register_operand")
@@ -7628,6 +7658,36 @@ (define_insn_and_split "*sub<mode>_1_slp"
[(set_attr "type" "alu")
(set_attr "mode" "<MODE>")])
+;; Alternative 1 is needed to work around LRA limitation, see PR82524.
+(define_insn_and_split "*subqi_ext<mode>_1_slp"
+ [(set (strict_low_part (match_operand:QI 0 "register_operand" "+Q,&Q"))
+ (minus:QI
+ (match_operand:QI 1 "nonimmediate_operand" "0,!Q")
+ (subreg:QI
+ (match_operator:SWI248 3 "extract_operator"
+ [(match_operand 2 "int248_register_operand" "Q,Q")
+ (const_int 8)
+ (const_int 8)]) 0)))
+ (clobber (reg:CC FLAGS_REG))]
+ ""
+ "@
+ sub{b}\t{%h2, %0|%0, %h2}
+ #"
+ "reload_completed
+ && !rtx_equal_p (operands[0], operands[1])"
+ [(set (strict_low_part (match_dup 0)) (match_dup 1))
+ (parallel
+ [(set (strict_low_part (match_dup 0))
+ (minus:QI
+ (match_dup 1)
+ (subreg:QI
+ (match_op_dup 3
+ [(match_dup 0) (const_int 8) (const_int 8)]) 0)))
+ (clobber (reg:CC FLAGS_REG))])]
+ ""
+ [(set_attr "type" "alu")
+ (set_attr "mode" "QI")])
+
(define_insn "*sub<mode>_2"
[(set (reg FLAGS_REG)
(compare
@@ -11423,6 +11483,36 @@ (define_insn_and_split "*<code><mode>_1_slp"
[(set_attr "type" "alu")
(set_attr "mode" "<MODE>")])
+;; Alternative 1 is needed to work around LRA limitation, see PR82524.
+(define_insn_and_split "*<code>qi_ext<mode>_1_slp"
+ [(set (strict_low_part (match_operand:QI 0 "register_operand" "+Q,&Q"))
+ (any_logic:QI
+ (subreg:QI
+ (match_operator:SWI248 3 "extract_operator"
+ [(match_operand 2 "int248_register_operand" "Q,Q")
+ (const_int 8)
+ (const_int 8)]) 0)
+ (match_operand:QI 1 "nonimmediate_operand" "0,!Q")))
+ (clobber (reg:CC FLAGS_REG))]
+ ""
+ "@
+ <logic>{b}\t{%h2, %0|%0, %h2}
+ #"
+ "reload_completed
+ && !rtx_equal_p (operands[0], operands[1])"
+ [(set (strict_low_part (match_dup 0)) (match_dup 1))
+ (parallel
+ [(set (strict_low_part (match_dup 0))
+ (any_logic:QI
+ (match_dup 1)
+ (subreg:QI
+ (match_op_dup 3
+ [(match_dup 0) (const_int 8) (const_int 8)]) 0)))
+ (clobber (reg:CC FLAGS_REG))])]
+ ""
+ [(set_attr "type" "alu")
+ (set_attr "mode" "QI")])
+
(define_split
[(set (match_operand:SWI248 0 "register_operand")
(and:SWI248 (match_operand:SWI248 1 "nonimmediate_operand")
diff --git a/gcc/testsuite/gcc.target/i386/pr78904-7.c
b/gcc/testsuite/gcc.target/i386/pr78904-7.c
new file mode 100644
index 00000000000..e52a26992ab
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr78904-7.c
@@ -0,0 +1,64 @@
+/* PR target/78904 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -masm=att" } */
+/* { dg-final { scan-assembler-not "movzbl" } } */
+/* { dg-final { scan-assembler-not "movb" } } */
+
+struct S1
+{
+ unsigned char val;
+ unsigned char pad1;
+ unsigned short pad2;
+};
+
+struct S2
+{
+ unsigned char pad1;
+ unsigned char val;
+ unsigned short pad2;
+};
+
+struct S1 test_and (struct S1 a, struct S2 b)
+{
+ a.val &= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]andb" } } */
+
+struct S1 test_or (struct S1 a, struct S2 b)
+{
+ a.val |= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]orb" } } */
+
+struct S1 test_xor (struct S1 a, struct S2 b)
+{
+ a.val ^= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]xorb" } } */
+
+struct S1 test_add (struct S1 a, struct S2 b)
+{
+ a.val += b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]addb" } } */
+
+struct S1 test_sub (struct S1 a, struct S2 b)
+{
+ a.val -= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]subb" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr78904-7a.c
b/gcc/testsuite/gcc.target/i386/pr78904-7a.c
new file mode 100644
index 00000000000..c060a482ba2
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr78904-7a.c
@@ -0,0 +1,62 @@
+/* PR target/78904 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -masm=att" } */
+/* { dg-final { scan-assembler-not "movzbl" } } */
+/* { dg-final { scan-assembler-not "movb" } } */
+
+struct S1
+{
+ unsigned char val;
+ unsigned char pad1;
+};
+
+struct S2
+{
+ unsigned char pad1;
+ unsigned char val;
+};
+
+struct S1 test_and (struct S1 a, struct S2 b)
+{
+ a.val &= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]andb" } } */
+
+struct S1 test_or (struct S1 a, struct S2 b)
+{
+ a.val |= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]orb" } } */
+
+struct S1 test_xor (struct S1 a, struct S2 b)
+{
+ a.val ^= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]xorb" } } */
+
+struct S1 test_add (struct S1 a, struct S2 b)
+{
+ a.val += b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]addb" } } */
+
+struct S1 test_sub (struct S1 a, struct S2 b)
+{
+ a.val -= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]subb" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr78904-7b.c
b/gcc/testsuite/gcc.target/i386/pr78904-7b.c
new file mode 100644
index 00000000000..76dc048e73f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr78904-7b.c
@@ -0,0 +1,66 @@
+/* PR target/78904 */
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-O2 -masm=att" } */
+/* { dg-final { scan-assembler-not "movzbl" } } */
+/* { dg-final { scan-assembler-not "movb" } } */
+
+struct S1
+{
+ unsigned char val;
+ unsigned char pad1;
+ unsigned short pad2;
+ unsigned int pad3;
+};
+
+struct S2
+{
+ unsigned char pad1;
+ unsigned char val;
+ unsigned short pad2;
+ unsigned int pad3;
+};
+
+struct S1 test_and (struct S1 a, struct S2 b)
+{
+ a.val &= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]andb" } } */
+
+struct S1 test_or (struct S1 a, struct S2 b)
+{
+ a.val |= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]orb" } } */
+
+struct S1 test_xor (struct S1 a, struct S2 b)
+{
+ a.val ^= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]xorb" } } */
+
+struct S1 test_add (struct S1 a, struct S2 b)
+{
+ a.val += b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]addb" } } */
+
+struct S1 test_sub (struct S1 a, struct S2 b)
+{
+ a.val -= b.val;
+
+ return a;
+}
+
+/* { dg-final { scan-assembler "\[ \t\]subb" } } */
