[PATCH V3] rs6000: Don't ICE when compiling the __builtin_vsx_splat_2di built-in [PR113950]

[jeevitha <jeevitha@linux.vnet.ibm.com>]

Hi All,

The following patch has been bootstrapped and regtested on powerpc64le-linux.
										
When we expand the __builtin_vsx_splat_2di function, we were allowing immediate
value for second operand which causes an unrecognizable insn ICE. Even though
the immediate value was forced into a register, it wasn't correctly assigned
to the second operand. So corrected the assignment of op1 to operands[1].

2024-02-29  Jeevitha Palanisamy  <jeevitha@linux.ibm.com>

gcc/
	PR target/113950
	* config/rs6000/vsx.md (vsx_splat_<mode>): Corrected assignment to
	operand1.

gcc/testsuite/
	PR target/113950
	* gcc.target/powerpc/pr113950.c: New testcase.

diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index 6111cc90eb7..f135fa079bd 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -4666,8 +4666,8 @@
   rtx op1 = operands[1];
   if (MEM_P (op1))
     operands[1] = rs6000_force_indexed_or_indirect_mem (op1);
-  else if (!REG_P (op1))
-    op1 = force_reg (<VSX_D:VEC_base>mode, op1);
+  else
+    operands[1] = force_reg (<VSX_D:VEC_base>mode, op1);
 })
 
 (define_insn "vsx_splat_<mode>_reg"
diff --git a/gcc/testsuite/gcc.target/powerpc/pr113950.c b/gcc/testsuite/gcc.target/powerpc/pr113950.c
new file mode 100644
index 00000000000..64566a580d9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr113950.c
@@ -0,0 +1,24 @@
+/* PR target/113950 */
+/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-options "-O1 -mvsx" } */
+
+/* Verify we do not ICE on the following.  */
+
+void abort (void);
+
+int main ()
+{
+  int i;
+  vector signed long long vsll_result, vsll_expected_result;
+  signed long long sll_arg1;
+
+  sll_arg1 = 300;
+  vsll_expected_result = (vector signed long long) {300, 300};
+  vsll_result = __builtin_vsx_splat_2di (sll_arg1);  
+
+  for (i = 0; i < 2; i++)
+    if (vsll_result[i] != vsll_expected_result[i])
+      abort();
+
+  return 0;
+}