[gcc r14-3974] LoongArch: Fix bug of '<optab>di3_fake'.

[gcc r14-3974] LoongArch: Fix bug of '<optab>di3_fake'.

[LuluCheng]

https://gcc.gnu.org/g:9a033b9feffc9d97d5acfe8ca3cd16359f4b714b

commit r14-3974-g9a033b9feffc9d97d5acfe8ca3cd16359f4b714b
Author: Lulu Cheng <chenglulu@loongson.cn>
Date:   Mon Sep 11 16:20:29 2023 +0800

    LoongArch: Fix bug of '<optab>di3_fake'.
    
            PR target/111334
    
    gcc/ChangeLog:
    
            * config/loongarch/loongarch.md: Fix bug of '<optab>di3_fake'.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/loongarch/pr111334.c: New test.

Diff:
---
 gcc/config/loongarch/loongarch.md             | 20 +++++++++-----
 gcc/testsuite/gcc.target/loongarch/pr111334.c | 39 +++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 7 deletions(-)

diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
index 1dc6b524416..4fcb6d781d5 100644
--- a/gcc/config/loongarch/loongarch.md
+++ b/gcc/config/loongarch/loongarch.md
@@ -72,6 +72,9 @@
   UNSPEC_LUI_H_HI12
   UNSPEC_TLS_LOW
 
+  ;; Fake div.w[u] mod.w[u]
+  UNSPEC_FAKE_ANY_DIV
+
   UNSPEC_SIBCALL_VALUE_MULTIPLE_INTERNAL_1
   UNSPEC_CALL_VALUE_MULTIPLE_INTERNAL_1
 ])
@@ -900,7 +903,7 @@
 		     (match_operand:GPR 2 "register_operand")))]
   ""
 {
- if (GET_MODE (operands[0]) == SImode)
+ if (GET_MODE (operands[0]) == SImode && TARGET_64BIT)
   {
     rtx reg1 = gen_reg_rtx (DImode);
     rtx reg2 = gen_reg_rtx (DImode);
@@ -920,9 +923,9 @@
 })
 
 (define_insn "*<optab><mode>3"
-  [(set (match_operand:GPR 0 "register_operand" "=r,&r,&r")
-	(any_div:GPR (match_operand:GPR 1 "register_operand" "r,r,0")
-		     (match_operand:GPR 2 "register_operand" "r,r,r")))]
+  [(set (match_operand:X 0 "register_operand" "=r,&r,&r")
+	(any_div:X (match_operand:X 1 "register_operand" "r,r,0")
+		   (match_operand:X 2 "register_operand" "r,r,r")))]
   ""
 {
   return loongarch_output_division ("<insn>.<d><u>\t%0,%1,%2", operands);
@@ -938,9 +941,12 @@
 (define_insn "<optab>di3_fake"
   [(set (match_operand:DI 0 "register_operand" "=r,&r,&r")
 	(sign_extend:DI
-	  (any_div:SI (match_operand:DI 1 "register_operand" "r,r,0")
-		      (match_operand:DI 2 "register_operand" "r,r,r"))))]
-  ""
+	  (unspec:SI
+	   [(subreg:SI
+	     (any_div:DI (match_operand:DI 1 "register_operand" "r,r,0")
+			 (match_operand:DI 2 "register_operand" "r,r,r")) 0)]
+	  UNSPEC_FAKE_ANY_DIV)))]
+  "TARGET_64BIT"
 {
   return loongarch_output_division ("<insn>.w<u>\t%0,%1,%2", operands);
 }
diff --git a/gcc/testsuite/gcc.target/loongarch/pr111334.c b/gcc/testsuite/gcc.target/loongarch/pr111334.c
new file mode 100644
index 00000000000..47366afcb74
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/pr111334.c
@@ -0,0 +1,39 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+unsigned
+util_next_power_of_two (unsigned x)
+{
+  return (1 << __builtin_clz (x - 1));
+}
+
+extern int create_vec_from_array (void);
+
+struct ac_shader_args {
+    struct {
+	unsigned char offset;
+	unsigned char size;
+    } args[384];
+};
+
+struct isel_context {
+    const struct ac_shader_args* args;
+    int arg_temps[384];
+};
+
+
+void
+add_startpgm (struct isel_context* ctx, unsigned short arg_count)
+{
+
+  for (unsigned i = 0, arg = 0; i < arg_count; i++)
+    {
+      unsigned size = ctx->args->args[i].size;
+      unsigned reg = ctx->args->args[i].offset;
+
+      if (reg % ( 4 < util_next_power_of_two (size)
+		 ? 4 : util_next_power_of_two (size)))
+	  ctx->arg_temps[i] = create_vec_from_array ();
+    }
+}
+