tests/driver/ppc_float_abi.d: add a test to test ppc64 real type

ABI switching

Author: liushuyu

tests/driver/ppc_float_abi.d

@@ -0,0 +1,19 @@
+// REQUIRES: target_PowerPC
+
+// RUN: %ldc -c -output-ll -of=%t.ll %s -mtriple=powerpc64le-linux-gnu -mabi=ieeelongdouble && FileCheck %s --check-prefix=CHECK-GNU-IEEE < %t.ll
+// RUN: %ldc -c -output-ll -of=%t.ll %s -mtriple=powerpc64le-linux-gnu && FileCheck %s --check-prefix=CHECK-IBM-LDBL < %t.ll
+// the following is an invalid configuration: Musl does not support IEEE quad fp on powerpc
+// RUN: %ldc -c -output-ll -of=%t.ll %s -mtriple=powerpc64le-linux-musl -mabi=ieeelongdouble && FileCheck %s --check-prefix=CHECK-MUSL < %t.ll
+
+// CHECK-GNU-IEEE-LABEL: @_Z13test_functionu9__ieee128
+// CHECK-IBM-LDBL-LABEL: @_Z13test_functiong
+// CHECK-MUSL-LABEL: @_Z13test_functione
+extern (C++) bool test_function(real arg) {
+    // CHECK-GNU-IEEE: fcmp ogt fp128 {{.*}}, 0xL00000000000000000000000000000000
+    // CHECK-IBM-LDBL: fcmp ogt ppc_fp128 {{.*}}, 0xM00000000000000000000000000000000
+    // CHECK-MUSL: fcmp ogt double {{.*}}, 0.000000e+00
+    return arg > 0.0;
+}
+
+// CHECK-GNU-IEEE: !{i32 1, !"float-abi", !"ieeequad"}
+// CHECK-IBM-LDBL: !{i32 1, !"float-abi", !"doubledouble"}