1 files changed, 51 insertions, 0 deletions
diff --git a/test/CodeGenCXX/arm-pcs.cpp b/test/CodeGenCXX/arm-pcs.cpp
new file mode 100644
index 0000000000..1d327d794b
--- /dev/null
+++ b/test/CodeGenCXX/arm-pcs.cpp
@@ -0,0 +1,51 @@
+// Covers a bug fix for ABI selection with homogenous aggregates:
+//  See: https://bugs.llvm.org/show_bug.cgi?id=39982
+
+// REQUIRES: arm-registered-target
+// RUN: %clang -mfloat-abi=hard --target=armv7-unknown-linux-gnueabi -O3 -S -o - %s | FileCheck %s -check-prefixes=HARD,CHECK
+// RUN: %clang -mfloat-abi=softfp --target=armv7-unknown-linux-gnueabi -O3 -S -o - %s | FileCheck %s -check-prefixes=SOFTFP,CHECK
+// RUN: %clang -mfloat-abi=soft --target=armv7-unknown-linux-gnueabi -O3 -S -o - %s | FileCheck %s -check-prefixes=SOFT,CHECK
+
+struct S {
+  float f;
+  float d;
+  float c;
+  float t;
+};
+
+// Variadic functions should always marshal for the base standard.
+// See section 5.5 (Parameter Passing) of the AAPCS.
+float __attribute__((pcs("aapcs-vfp"))) variadic(S s, ...) {
+  // CHECK-NOT: vmov s{{[0-9]+}}, s{{[0-9]+}}
+  // CHECK: mov r{{[0-9]+}}, r{{[0-9]+}}
+  return s.d;
+}
+
+float no_attribute(S s) {
+  // SOFT: mov r{{[0-9]+}}, r{{[0-9]+}}
+  // SOFTFP: mov r{{[0-9]+}}, r{{[0-9]+}}
+  // HARD: vmov.f32 s{{[0-9]+}}, s{{[0-9]+}}
+  return s.d;
+}
+
+float __attribute__((pcs("aapcs-vfp"))) baz(float x, float y) {
+  // CHECK-NOT: mov s{{[0-9]+}}, r{{[0-9]+}}
+  // SOFT: mov r{{[0-9]+}}, r{{[0-9]+}}
+  // SOFTFP: vmov.f32 s{{[0-9]+}}, s{{[0-9]+}}
+  // HARD: vmov.f32 s{{[0-9]+}}, s{{[0-9]+}}
+  return y;
+}
+
+float __attribute__((pcs("aapcs-vfp"))) foo(S s) {
+  // CHECK-NOT: mov s{{[0-9]+}}, r{{[0-9]+}}
+  // SOFT: mov r{{[0-9]+}}, r{{[0-9]+}}
+  // SOFTFP: vmov.f32 s{{[0-9]+}}, s{{[0-9]+}}
+  // HARD: vmov.f32 s{{[0-9]+}}, s{{[0-9]+}}
+  return s.d;
+}
+
+float __attribute__((pcs("aapcs"))) bar(S s) {
+  // CHECK-NOT: vmov.f32 s{{[0-9]+}}, s{{[0-9]+}}
+  // CHECK: mov r{{[0-9]+}}, r{{[0-9]+}}
+  return s.d;
+}