[gcc r14-1929] RISC-V: Add sign-extending variants for vmv.x.s.

[gcc r14-1929] RISC-V: Add sign-extending variants for vmv.x.s.

[Robin Dapp]

https://gcc.gnu.org/g:9b24611acf2cda332378a84a1858752c51f61411

commit r14-1929-g9b24611acf2cda332378a84a1858752c51f61411
Author: Robin Dapp <rdapp@ventanamicro.com>
Date:   Mon Jun 5 13:12:01 2023 +0200

    RISC-V: Add sign-extending variants for vmv.x.s.
    
    When the destination register of a vmv.x.s needs to be sign extended to
    XLEN we currently emit an sext insn.  Since vmv.x.s performs this
    automatically this patch adds two instruction patterns that include
    sign_extend for the destination operand.
    
    gcc/ChangeLog:
    
            * config/riscv/vector-iterators.md: Add VI_QH iterator.
            * config/riscv/autovec-opt.md
            (@pred_extract_first_sextdi<mode>): New vmv.x.s pattern
            that includes sign extension.
            (@pred_extract_first_sextsi<mode>): Dito for SImode.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-1.c: Ensure
            that no sext insns are present.
            * gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-2.c: Dito.
            * gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-3.c: Dito.
            * gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-4.c: Dito.

Diff:
---
 gcc/config/riscv/autovec-opt.md                    | 29 ++++++++++++++++++++++
 gcc/config/riscv/vector-iterators.md               |  5 ++++
 .../riscv/rvv/autovec/vls-vlmax/vec_extract-1.c    |  2 ++
 .../riscv/rvv/autovec/vls-vlmax/vec_extract-2.c    |  2 ++
 .../riscv/rvv/autovec/vls-vlmax/vec_extract-3.c    |  2 ++
 .../riscv/rvv/autovec/vls-vlmax/vec_extract-4.c    |  2 ++
 6 files changed, 42 insertions(+)

diff --git a/gcc/config/riscv/autovec-opt.md b/gcc/config/riscv/autovec-opt.md
index fb1b07205aa..28040805b23 100644
--- a/gcc/config/riscv/autovec-opt.md
+++ b/gcc/config/riscv/autovec-opt.md
@@ -376,3 +376,32 @@
 }
  [(set_attr "type" "vnshift")
   (set_attr "mode" "<V_DOUBLE_TRUNC>")])
+
+;; -------------------------------------------------------------------------
+;; ---- Sign-extension for vmv.x.s.
+;; -------------------------------------------------------------------------
+(define_insn "*pred_extract_first_sextdi<mode>"
+  [(set (match_operand:DI 0 "register_operand"		"=r")
+	(sign_extend:DI
+          (unspec:<VEL>
+	    [(vec_select:<VEL>
+	       (match_operand:VI_QHS 1 "register_operand""vr")
+	       (parallel [(const_int 0)]))
+	     (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)))]
+  "TARGET_VECTOR && Pmode == DImode"
+  "vmv.x.s\t%0,%1"
+  [(set_attr "type" "vimovvx")
+   (set_attr "mode" "<MODE>")])
+
+(define_insn "*pred_extract_first_sextsi<mode>"
+  [(set (match_operand:SI 0 "register_operand"		  "=r")
+	(sign_extend:SI
+          (unspec:<VEL>
+	    [(vec_select:<VEL>
+	       (match_operand:VI_QH 1 "register_operand"  "vr")
+	       (parallel [(const_int 0)]))
+	     (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)))]
+  "TARGET_VECTOR && Pmode == SImode"
+  "vmv.x.s\t%0,%1"
+  [(set_attr "type" "vimovvx")
+   (set_attr "mode" "<MODE>")])
diff --git a/gcc/config/riscv/vector-iterators.md b/gcc/config/riscv/vector-iterators.md
index a5a660e2403..1e35fb18b5d 100644
--- a/gcc/config/riscv/vector-iterators.md
+++ b/gcc/config/riscv/vector-iterators.md
@@ -352,6 +352,11 @@
   (VNx2DI "TARGET_FULL_V") (VNx4DI "TARGET_FULL_V") (VNx8DI "TARGET_FULL_V") (VNx16DI "TARGET_FULL_V")
 ])
 
+(define_mode_iterator VI_QH [
+  (VNx1QI "TARGET_MIN_VLEN < 128") VNx2QI VNx4QI VNx8QI VNx16QI VNx32QI (VNx64QI "TARGET_MIN_VLEN > 32") (VNx128QI "TARGET_MIN_VLEN >= 128")
+  (VNx1HI "TARGET_MIN_VLEN < 128") VNx2HI VNx4HI VNx8HI VNx16HI (VNx32HI "TARGET_MIN_VLEN > 32") (VNx64HI "TARGET_MIN_VLEN >= 128")
+])
+
 (define_mode_iterator VI_QHS [
   (VNx1QI "TARGET_MIN_VLEN < 128") VNx2QI VNx4QI VNx8QI VNx16QI VNx32QI (VNx64QI "TARGET_MIN_VLEN > 32") (VNx128QI "TARGET_MIN_VLEN >= 128")
   (VNx1HI "TARGET_MIN_VLEN < 128") VNx2HI VNx4HI VNx8HI VNx16HI (VNx32HI "TARGET_MIN_VLEN > 32") (VNx64HI "TARGET_MIN_VLEN >= 128")
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-1.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-1.c
index bda5843e8e6..1a6e6dd83ee 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-1.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-1.c
@@ -55,3 +55,5 @@ TEST_ALL1 (VEC_EXTRACT)
 
 /* { dg-final { scan-assembler-times {\tvfmv.f.s} 8 } } */
 /* { dg-final { scan-assembler-times {\tvmv.x.s} 13 } } */
+
+/* { dg-final { scan-assembler-not {\tsext} } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-2.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-2.c
index 43aa15c7ddb..884c38e0bd8 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-2.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-2.c
@@ -66,3 +66,5 @@ TEST_ALL2 (VEC_EXTRACT)
 
 /* { dg-final { scan-assembler-times {\tvfmv.f.s} 14 } } */
 /* { dg-final { scan-assembler-times {\tvmv.x.s} 19 } } */
+
+/* { dg-final { scan-assembler-not {\tsext} } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-3.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-3.c
index da26ed9715f..844ad392df0 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-3.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-3.c
@@ -67,3 +67,5 @@ TEST_ALL3 (VEC_EXTRACT)
 
 /* { dg-final { scan-assembler-times {\tvfmv.f.s} 15 } } */
 /* { dg-final { scan-assembler-times {\tvmv.x.s} 19 } } */
+
+/* { dg-final { scan-assembler-not {\tsext} } } */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-4.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-4.c
index 0d7c0e16586..04c234e7d2d 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-4.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/vls-vlmax/vec_extract-4.c
@@ -70,3 +70,5 @@ TEST_ALL4 (VEC_EXTRACT)
 
 /* { dg-final { scan-assembler-times {\tvfmv.f.s} 17 } } */
 /* { dg-final { scan-assembler-times {\tvmv.x.s} 20 } } */
+
+/* { dg-final { scan-assembler-not {\tsext} } } */