[gcc r14-3643] LoongArch: Support storing floating-point zero into MEM[base + index].

[LuluCheng <chenglulu@gcc.gnu.org>]

https://gcc.gnu.org/g:828130772c67c94dce0757d70b4e96fb7c14ea6e

commit r14-3643-g828130772c67c94dce0757d70b4e96fb7c14ea6e
Author: Guo Jie <guojie@loongson.cn>
Date:   Fri Sep 1 16:35:05 2023 +0800

    LoongArch: Support storing floating-point zero into MEM[base + index].
    
    v2: Modify commit message.
    
    gcc/ChangeLog:
    
            * config/loongarch/loongarch.md: Support 'G' -> 'k' in
            movsf_hardfloat and movdf_hardfloat.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/loongarch/const-double-zero-stx.c: New test.

Diff:
---
 gcc/config/loongarch/loongarch.md                      | 12 ++++++------
 .../gcc.target/loongarch/const-double-zero-stx.c       | 18 ++++++++++++++++++
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
index 0d15302f0452..25e2e1e05970 100644
--- a/gcc/config/loongarch/loongarch.md
+++ b/gcc/config/loongarch/loongarch.md
@@ -1915,13 +1915,13 @@
 })
 
 (define_insn "*movsf_hardfloat"
-  [(set (match_operand:SF 0 "nonimmediate_operand" "=f,f,f,m,f,k,m,*f,*r,*r,*r,*m")
-	(match_operand:SF 1 "move_operand" "f,G,m,f,k,f,G,*r,*f,*G*r,*m,*r"))]
+  [(set (match_operand:SF 0 "nonimmediate_operand" "=f,f,f,m,f,k,m,k,*f,*r,*r,*r,*m")
+	(match_operand:SF 1 "move_operand" "f,G,m,f,k,f,G,G,*r,*f,*G*r,*m,*r"))]
   "TARGET_HARD_FLOAT
    && (register_operand (operands[0], SFmode)
        || reg_or_0_operand (operands[1], SFmode))"
   { return loongarch_output_move (operands[0], operands[1]); }
-  [(set_attr "move_type" "fmove,mgtf,fpload,fpstore,fpload,fpstore,store,mgtf,mftg,move,load,store")
+  [(set_attr "move_type" "fmove,mgtf,fpload,fpstore,fpload,fpstore,store,store,mgtf,mftg,move,load,store")
    (set_attr "mode" "SF")])
 
 (define_insn "*movsf_softfloat"
@@ -1946,13 +1946,13 @@
 })
 
 (define_insn "*movdf_hardfloat"
-  [(set (match_operand:DF 0 "nonimmediate_operand" "=f,f,f,m,f,k,m,*f,*r,*r,*r,*m")
-	(match_operand:DF 1 "move_operand" "f,G,m,f,k,f,G,*r,*f,*r*G,*m,*r"))]
+  [(set (match_operand:DF 0 "nonimmediate_operand" "=f,f,f,m,f,k,m,k,*f,*r,*r,*r,*m")
+	(match_operand:DF 1 "move_operand" "f,G,m,f,k,f,G,G,*r,*f,*r*G,*m,*r"))]
   "TARGET_DOUBLE_FLOAT
    && (register_operand (operands[0], DFmode)
        || reg_or_0_operand (operands[1], DFmode))"
   { return loongarch_output_move (operands[0], operands[1]); }
-  [(set_attr "move_type" "fmove,mgtf,fpload,fpstore,fpload,fpstore,store,mgtf,mftg,move,load,store")
+  [(set_attr "move_type" "fmove,mgtf,fpload,fpstore,fpload,fpstore,store,store,mgtf,mftg,move,load,store")
    (set_attr "mode" "DF")])
 
 (define_insn "*movdf_softfloat"
diff --git a/gcc/testsuite/gcc.target/loongarch/const-double-zero-stx.c b/gcc/testsuite/gcc.target/loongarch/const-double-zero-stx.c
new file mode 100644
index 000000000000..8fb04be8ff5d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/const-double-zero-stx.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-times {stx\..\t\$r0} 2 } } */
+
+extern float arr_f[];
+extern double arr_d[];
+
+void
+test_f (int base, int index)
+{
+  arr_f[base + index] = 0.0;
+}
+
+void
+test_d (int base, int index)
+{
+  arr_d[base + index] = 0.0;
+}