Hi,
This is part of a series of patches where I am trying to add new
instructions for Armv8.1-M Mainline to the arm backend.
This patch is adding the following instructions:
ASRL (imm)
LSLL (imm)
LSRL (imm)
ChangeLog entry are as follow:
*** gcc/ChangeLog ***
2019-11-14 Mihail-Calin Ionescu <mihail.ione...@arm.com>
2019-11-14 Sudakshina Das <sudi....@arm.com>
* config/arm/arm.md (ashldi3): Generate thumb2_lsll for both reg
and valid immediate.
(ashrdi3): Generate thumb2_asrl for both reg and valid immediate.
(lshrdi3): Generate thumb2_lsrl for valid immediates.
* config/arm/constraints.md (Pg): New.
* config/arm/predicates.md (long_shift_imm): New.
(arm_reg_or_long_shift_imm): Likewise.
* config/arm/thumb2.md (thumb2_asrl): New immediate alternative.
(thumb2_lsll): Likewise.
(thumb2_lsrl): New.
*** gcc/testsuite/ChangeLog ***
2019-11-14 Mihail-Calin Ionescu <mihail.ione...@arm.com>
2019-11-14 Sudakshina Das <sudi....@arm.com>
* gcc.target/arm/armv8_1m-shift-imm_1.c: New test.
Testsuite shows no regression when run for arm-none-eabi targets.
Is this ok for trunk?
Thanks
Mihail
############### Attachment also inlined for ease of reply ###############
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index
b735f858a6a5c94d02a6765c1b349cdcb5e77ee3..82f4a5573d43925fb7638b9078a06699df38f88c
100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -3509,8 +3509,8 @@
operands[2] = force_reg (SImode, operands[2]);
/* Armv8.1-M Mainline double shifts are not expanded. */
- if (REG_P (operands[2]))
- {
+ if (arm_reg_or_long_shift_imm (operands[2], GET_MODE (operands[2])))
+ {
if (!reg_overlap_mentioned_p(operands[0], operands[1]))
emit_insn (gen_movdi (operands[0], operands[1]));
@@ -3547,7 +3547,8 @@
"TARGET_32BIT"
"
/* Armv8.1-M Mainline double shifts are not expanded. */
- if (TARGET_HAVE_MVE && REG_P (operands[2]))
+ if (TARGET_HAVE_MVE
+ && arm_reg_or_long_shift_imm (operands[2], GET_MODE (operands[2])))
{
if (!reg_overlap_mentioned_p(operands[0], operands[1]))
emit_insn (gen_movdi (operands[0], operands[1]));
@@ -3580,6 +3581,17 @@
(match_operand:SI 2 "reg_or_int_operand")))]
"TARGET_32BIT"
"
+ /* Armv8.1-M Mainline double shifts are not expanded. */
+ if (TARGET_HAVE_MVE
+ && long_shift_imm (operands[2], GET_MODE (operands[2])))
+ {
+ if (!reg_overlap_mentioned_p(operands[0], operands[1]))
+ emit_insn (gen_movdi (operands[0], operands[1]));
+
+ emit_insn (gen_thumb2_lsrl (operands[0], operands[2]));
+ DONE;
+ }
+
arm_emit_coreregs_64bit_shift (LSHIFTRT, operands[0], operands[1],
operands[2], gen_reg_rtx (SImode),
gen_reg_rtx (SImode));
diff --git a/gcc/config/arm/constraints.md b/gcc/config/arm/constraints.md
index
b76de81b85c8ce7a2ca484a750b908b7ca64600a..d807818c8499a6a65837f1ed0487e45947f68199
100644
--- a/gcc/config/arm/constraints.md
+++ b/gcc/config/arm/constraints.md
@@ -35,7 +35,7 @@
;; Dt, Dp, Dz, Tu
;; in Thumb-1 state: Pa, Pb, Pc, Pd, Pe
;; in Thumb-2 state: Ha, Pj, PJ, Ps, Pt, Pu, Pv, Pw, Px, Py, Pz
-;; in all states: Pf
+;; in all states: Pf, Pg
;; The following memory constraints have been used:
;; in ARM/Thumb-2 state: Uh, Ut, Uv, Uy, Un, Um, Us
@@ -187,6 +187,11 @@
&& !is_mm_consume (memmodel_from_int (ival))
&& !is_mm_release (memmodel_from_int (ival))")))
+(define_constraint "Pg"
+ "@internal In Thumb-2 state a constant in range 1 to 32"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= 1 && ival <= 32")))
+
(define_constraint "Ps"
"@internal In Thumb-2 state a constant in the range -255 to +255"
(and (match_code "const_int")
diff --git a/gcc/config/arm/predicates.md b/gcc/config/arm/predicates.md
index
69c10c06ff405e19efa172217a08a512c66cb902..ef5b0303d4424981347287865efb3cca85e56f36
100644
--- a/gcc/config/arm/predicates.md
+++ b/gcc/config/arm/predicates.md
@@ -322,6 +322,15 @@
&& (UINTVAL (XEXP (op, 1)) < 32)")))
(match_test "mode == GET_MODE (op)")))
+;; True for Armv8.1-M Mainline long shift instructions.
+(define_predicate "long_shift_imm"
+ (match_test "satisfies_constraint_Pg (op)"))
+
+(define_predicate "arm_reg_or_long_shift_imm"
+ (ior (match_test "TARGET_THUMB2
+ && arm_general_register_operand (op, GET_MODE (op))")
+ (match_test "satisfies_constraint_Pg (op)")))
+
;; True for MULT, to identify which variant of shift_operator is in use.
(define_special_predicate "mult_operator"
(match_code "mult"))
diff --git a/gcc/config/arm/thumb2.md b/gcc/config/arm/thumb2.md
index
3a716ea954ac55b2081121248b930b7f11520ffa..af486d07f428030257855381ff72c32a885b506f
100644
--- a/gcc/config/arm/thumb2.md
+++ b/gcc/config/arm/thumb2.md
@@ -1649,7 +1649,7 @@
(define_insn "thumb2_asrl"
[(set (match_operand:DI 0 "arm_general_register_operand" "+r")
(ashiftrt:DI (match_dup 0)
- (match_operand:SI 1 "arm_general_register_operand" "r")))]
+ (match_operand:SI 1 "arm_reg_or_long_shift_imm" "rPg")))]
"TARGET_HAVE_MVE"
"asrl%?\\t%Q0, %R0, %1"
[(set_attr "predicable" "yes")])
@@ -1657,7 +1657,15 @@
(define_insn "thumb2_lsll"
[(set (match_operand:DI 0 "arm_general_register_operand" "+r")
(ashift:DI (match_dup 0)
- (match_operand:SI 1 "arm_general_register_operand" "r")))]
+ (match_operand:SI 1 "arm_reg_or_long_shift_imm" "rPg")))]
"TARGET_HAVE_MVE"
"lsll%?\\t%Q0, %R0, %1"
[(set_attr "predicable" "yes")])
+
+(define_insn "thumb2_lsrl"
+ [(set (match_operand:DI 0 "arm_general_register_operand" "+r")
+ (lshiftrt:DI (match_dup 0)
+ (match_operand:SI 1 "long_shift_imm" "Pg")))]
+ "TARGET_HAVE_MVE"
+ "lsrl%?\\t%Q0, %R0, %1"
+ [(set_attr "predicable" "yes")])
diff --git a/gcc/testsuite/gcc.target/arm/armv8_1m-shift-imm-1.c
b/gcc/testsuite/gcc.target/arm/armv8_1m-shift-imm-1.c
new file mode 100644
index
0000000000000000000000000000000000000000..5ffa3769e6ba42466242d3038857734e87b2f1fc
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/armv8_1m-shift-imm-1.c
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=armv8.1-m.main+mve -mfloat-abi=softfp" } */
