File backport-clang-r233543 of Package llvm.7809

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File backport-clang-r233543 of Package llvm.7809

------------------------------------------------------------------------
r233543 | uweigand | 2015-03-30 15:49:01 +0200 (Mon, 30 Mar 2015) | 39 lines

[SystemZ] Fix some ABI corner cases

Running the GCC's inter-compiler ABI compatibility test suite uncovered
a couple of errors in clang's SystemZ ABI implementation.  These all
affect only rare corner cases:

- Short vector types

GCC synthetic vector types defined with __attribute__ ((vector_size ...))
are always passed and returned by reference.  (This is not documented in
the official ABI document, but is the de-facto ABI implemented by GCC.)
clang would do that only for vector sizes >= 16 bytes, but not for shorter
vector types.

- Float-like aggregates and empty bitfields

clang would consider any aggregate containing an empty bitfield as
first element to be a float-like aggregate.  That's obviously wrong.
According to the ABI doc, the presence of an empty bitfield makes
an aggregate to be *not* float-like.  However, due to a bug in GCC,
empty bitfields are ignored in C++; this patch changes clang to be
compatible with this "feature" of GCC.

- Float-like aggregates and va_arg

The va_arg implementation would mis-detect some aggregates as float-like
that aren't actually passed as such.  This applies to aggregates that
have only a single element of type float or double, but using an aligned
attribute that increases the total struct size to more than 8 bytes.

This error occurred because the va_arg implement used to have an copy
of the float-like aggregate detection logic (i.e. it would call the
isFPArgumentType routine, but not perform the size check).

To simplify the logic, this patch removes the duplicated logic and
instead simply checks the (possibly coerced) LLVM argument type as
already determined by classifyArgumentType.

------------------------------------------------------------------------
Index: tools/clang/test/CodeGen/systemz-abi.c
===================================================================
--- /dev/null
+++ tools/clang/test/CodeGen/systemz-abi.c
@@ -0,0 +1,252 @@
+// RUN: %clang_cc1 -triple s390x-linux-gnu -emit-llvm -o - %s | FileCheck %s
+
+// Scalar types
+
+char pass_char(char arg) { return arg; }
+// CHECK-LABEL: define signext i8 @pass_char(i8 signext %{{.*}})
+
+short pass_short(short arg) { return arg; }
+// CHECK-LABEL: define signext i16 @pass_short(i16 signext %{{.*}})
+
+int pass_int(int arg) { return arg; }
+// CHECK-LABEL: define signext i32 @pass_int(i32 signext %{{.*}})
+
+long pass_long(long arg) { return arg; }
+// CHECK-LABEL: define i64 @pass_long(i64 %{{.*}})
+
+long long pass_longlong(long long arg) { return arg; }
+// CHECK-LABEL: define i64 @pass_longlong(i64 %{{.*}})
+
+__int128 pass_int128(__int128 arg) { return arg; }
+// CHECK-LABEL: define void @pass_int128(i128* noalias sret %{{.*}}, i128*)
+
+float pass_float(float arg) { return arg; }
+// CHECK-LABEL: define float @pass_float(float %{{.*}})
+
+double pass_double(double arg) { return arg; }
+// CHECK-LABEL: define double @pass_double(double %{{.*}})
+
+long double pass_longdouble(long double arg) { return arg; }
+// CHECK-LABEL: define void @pass_longdouble(fp128* noalias sret %{{.*}}, fp128*)
+
+
+// Complex types
+
+_Complex char pass_complex_char(_Complex char arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_char({ i8, i8 }* noalias sret %{{.*}}, { i8, i8 }* %{{.*}}arg)
+
+_Complex short pass_complex_short(_Complex short arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_short({ i16, i16 }* noalias sret %{{.*}}, { i16, i16 }* %{{.*}}arg)
+
+_Complex int pass_complex_int(_Complex int arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_int({ i32, i32 }* noalias sret %{{.*}}, { i32, i32 }* %{{.*}}arg)
+
+_Complex long pass_complex_long(_Complex long arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_long({ i64, i64 }* noalias sret %{{.*}}, { i64, i64 }* %{{.*}}arg)
+
+_Complex long long pass_complex_longlong(_Complex long long arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_longlong({ i64, i64 }* noalias sret %{{.*}}, { i64, i64 }* %{{.*}}arg)
+
+_Complex float pass_complex_float(_Complex float arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_float({ float, float }* noalias sret %{{.*}}, { float, float }* %{{.*}}arg)
+
+_Complex double pass_complex_double(_Complex double arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_double({ double, double }* noalias sret %{{.*}}, { double, double }* %{{.*}}arg)
+
+_Complex long double pass_complex_longdouble(_Complex long double arg) { return arg; }
+// CHECK-LABEL: define void @pass_complex_longdouble({ fp128, fp128 }* noalias sret %{{.*}}, { fp128, fp128 }* %{{.*}}arg)
+
+
+// Aggregate types
+
+struct agg_1byte { char a[1]; };
+struct agg_1byte pass_agg_1byte(struct agg_1byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_1byte(%struct.agg_1byte* noalias sret %{{.*}}, i8 %{{.*}})
+
+struct agg_2byte { char a[2]; };
+struct agg_2byte pass_agg_2byte(struct agg_2byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_2byte(%struct.agg_2byte* noalias sret %{{.*}}, i16 %{{.*}})
+
+struct agg_3byte { char a[3]; };
+struct agg_3byte pass_agg_3byte(struct agg_3byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_3byte(%struct.agg_3byte* noalias sret %{{.*}}, %struct.agg_3byte* %{{.*}})
+
+struct agg_4byte { char a[4]; };
+struct agg_4byte pass_agg_4byte(struct agg_4byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_4byte(%struct.agg_4byte* noalias sret %{{.*}}, i32 %{{.*}})
+
+struct agg_5byte { char a[5]; };
+struct agg_5byte pass_agg_5byte(struct agg_5byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_5byte(%struct.agg_5byte* noalias sret %{{.*}}, %struct.agg_5byte* %{{.*}})
+
+struct agg_6byte { char a[6]; };
+struct agg_6byte pass_agg_6byte(struct agg_6byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_6byte(%struct.agg_6byte* noalias sret %{{.*}}, %struct.agg_6byte* %{{.*}})
+
+struct agg_7byte { char a[7]; };
+struct agg_7byte pass_agg_7byte(struct agg_7byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_7byte(%struct.agg_7byte* noalias sret %{{.*}}, %struct.agg_7byte* %{{.*}})
+
+struct agg_8byte { char a[8]; };
+struct agg_8byte pass_agg_8byte(struct agg_8byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_8byte(%struct.agg_8byte* noalias sret %{{.*}}, i64 %{{.*}})
+
+struct agg_16byte { char a[16]; };
+struct agg_16byte pass_agg_16byte(struct agg_16byte arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_16byte(%struct.agg_16byte* noalias sret %{{.*}}, %struct.agg_16byte* %{{.*}})
+
+
+// Float-like aggregate types
+
+struct agg_float { float a; };
+struct agg_float pass_agg_float(struct agg_float arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_float(%struct.agg_float* noalias sret %{{.*}}, float %{{.*}})
+
+struct agg_double { double a; };
+struct agg_double pass_agg_double(struct agg_double arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_double(%struct.agg_double* noalias sret %{{.*}}, double %{{.*}})
+
+struct agg_longdouble { long double a; };
+struct agg_longdouble pass_agg_longdouble(struct agg_longdouble arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_longdouble(%struct.agg_longdouble* noalias sret %{{.*}}, %struct.agg_longdouble* %{{.*}})
+
+struct agg_float_a8 { float a __attribute__((aligned (8))); };
+struct agg_float_a8 pass_agg_float_a8(struct agg_float_a8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_float_a8(%struct.agg_float_a8* noalias sret %{{.*}}, double %{{.*}})
+
+struct agg_float_a16 { float a __attribute__((aligned (16))); };
+struct agg_float_a16 pass_agg_float_a16(struct agg_float_a16 arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_float_a16(%struct.agg_float_a16* noalias sret %{{.*}}, %struct.agg_float_a16* %{{.*}})
+
+
+// Verify that the following are *not* float-like aggregate types
+
+struct agg_nofloat1 { float a; float b; };
+struct agg_nofloat1 pass_agg_nofloat1(struct agg_nofloat1 arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_nofloat1(%struct.agg_nofloat1* noalias sret %{{.*}}, i64 %{{.*}})
+
+struct agg_nofloat2 { float a; int b; };
+struct agg_nofloat2 pass_agg_nofloat2(struct agg_nofloat2 arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_nofloat2(%struct.agg_nofloat2* noalias sret %{{.*}}, i64 %{{.*}})
+
+struct agg_nofloat3 { float a; int : 0; };
+struct agg_nofloat3 pass_agg_nofloat3(struct agg_nofloat3 arg) { return arg; }
+// CHECK-LABEL: define void @pass_agg_nofloat3(%struct.agg_nofloat3* noalias sret %{{.*}}, i32 %{{.*}})
+
+
+// Accessing variable argument lists
+
+int va_int(__builtin_va_list l) { return __builtin_va_arg(l, int); }
+// CHECK-LABEL: define signext i32 @va_int(%struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 20
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 4
+// CHECK-NOT: %indirect_arg
+
+long va_long(__builtin_va_list l) { return __builtin_va_arg(l, long); }
+// CHECK-LABEL: define i64 @va_long(%struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+long long va_longlong(__builtin_va_list l) { return __builtin_va_arg(l, long long); }
+// CHECK-LABEL: define i64 @va_longlong(%struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+double va_double(__builtin_va_list l) { return __builtin_va_arg(l, double); }
+// CHECK-LABEL: define double @va_double(%struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 128
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+long double va_longdouble(__builtin_va_list l) { return __builtin_va_arg(l, long double); }
+// CHECK-LABEL: define void @va_longdouble(fp128* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load fp128*
+
+_Complex char va_complex_char(__builtin_va_list l) { return __builtin_va_arg(l, _Complex char); }
+// CHECK-LABEL: define void @va_complex_char({ i8, i8 }* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load { i8, i8 }*
+
+struct agg_1byte va_agg_1byte(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_1byte); }
+// CHECK-LABEL: define void @va_agg_1byte(%struct.agg_1byte* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 23
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 7
+// CHECK-NOT: %indirect_arg
+
+struct agg_2byte va_agg_2byte(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_2byte); }
+// CHECK-LABEL: define void @va_agg_2byte(%struct.agg_2byte* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 22
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 6
+// CHECK-NOT: %indirect_arg
+
+struct agg_3byte va_agg_3byte(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_3byte); }
+// CHECK-LABEL: define void @va_agg_3byte(%struct.agg_3byte* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load %struct.agg_3byte*
+
+struct agg_4byte va_agg_4byte(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_4byte); }
+// CHECK-LABEL: define void @va_agg_4byte(%struct.agg_4byte* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 20
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 4
+// CHECK-NOT: %indirect_arg
+
+struct agg_8byte va_agg_8byte(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_8byte); }
+// CHECK-LABEL: define void @va_agg_8byte(%struct.agg_8byte* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+struct agg_float va_agg_float(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_float); }
+// CHECK-LABEL: define void @va_agg_float(%struct.agg_float* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 128
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 4
+// CHECK-NOT: %indirect_arg
+
+struct agg_double va_agg_double(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_double); }
+// CHECK-LABEL: define void @va_agg_double(%struct.agg_double* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 128
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+struct agg_longdouble va_agg_longdouble(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_longdouble); }
+// CHECK-LABEL: define void @va_agg_longdouble(%struct.agg_longdouble* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load %struct.agg_longdouble*
+
+struct agg_float_a8 va_agg_float_a8(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_float_a8); }
+// CHECK-LABEL: define void @va_agg_float_a8(%struct.agg_float_a8* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 128
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+struct agg_float_a16 va_agg_float_a16(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_float_a16); }
+// CHECK-LABEL: define void @va_agg_float_a16(%struct.agg_float_a16* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load %struct.agg_float_a16*
+
+struct agg_nofloat1 va_agg_nofloat1(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_nofloat1); }
+// CHECK-LABEL: define void @va_agg_nofloat1(%struct.agg_nofloat1* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+struct agg_nofloat2 va_agg_nofloat2(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_nofloat2); }
+// CHECK-LABEL: define void @va_agg_nofloat2(%struct.agg_nofloat2* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK-NOT: %indirect_arg
+
+struct agg_nofloat3 va_agg_nofloat3(__builtin_va_list l) { return __builtin_va_arg(l, struct agg_nofloat3); }
+// CHECK-LABEL: define void @va_agg_nofloat3(%struct.agg_nofloat3* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}}
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 20
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 4
+// CHECK-NOT: %indirect_arg
+
Index: tools/clang/test/CodeGen/systemz-abi-vector.c
===================================================================
--- /dev/null
+++ tools/clang/test/CodeGen/systemz-abi-vector.c
@@ -0,0 +1,137 @@
+// RUN: %clang_cc1 -triple s390x-linux-gnu -emit-llvm -o - %s | FileCheck %s
+
+// Vector types
+
+typedef __attribute__((vector_size(1))) char v1i8;
+
+typedef __attribute__((vector_size(2))) char v2i8;
+typedef __attribute__((vector_size(2))) short v1i16;
+
+typedef __attribute__((vector_size(4))) char v4i8;
+typedef __attribute__((vector_size(4))) short v2i16;
+typedef __attribute__((vector_size(4))) int v1i32;
+typedef __attribute__((vector_size(4))) float v1f32;
+
+typedef __attribute__((vector_size(8))) char v8i8;
+typedef __attribute__((vector_size(8))) short v4i16;
+typedef __attribute__((vector_size(8))) int v2i32;
+typedef __attribute__((vector_size(8))) long long v1i64;
+typedef __attribute__((vector_size(8))) float v2f32;
+typedef __attribute__((vector_size(8))) double v1f64;
+
+typedef __attribute__((vector_size(16))) char v16i8;
+typedef __attribute__((vector_size(16))) short v8i16;
+typedef __attribute__((vector_size(16))) int v4i32;
+typedef __attribute__((vector_size(16))) long long v2i64;
+typedef __attribute__((vector_size(16))) __int128 v1i128;
+typedef __attribute__((vector_size(16))) float v4f32;
+typedef __attribute__((vector_size(16))) double v2f64;
+typedef __attribute__((vector_size(16))) long double v1f128;
+
+typedef __attribute__((vector_size(32))) char v32i8;
+
+v1i8 pass_v1i8(v1i8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1i8(<1 x i8>* noalias sret %{{.*}}, <1 x i8>*)
+
+v2i8 pass_v2i8(v2i8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v2i8(<2 x i8>* noalias sret %{{.*}}, <2 x i8>*)
+
+v4i8 pass_v4i8(v4i8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v4i8(<4 x i8>* noalias sret %{{.*}}, <4 x i8>*)
+
+v8i8 pass_v8i8(v8i8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v8i8(<8 x i8>* noalias sret %{{.*}}, <8 x i8>*)
+
+v16i8 pass_v16i8(v16i8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v16i8(<16 x i8>* noalias sret %{{.*}}, <16 x i8>*)
+
+v32i8 pass_v32i8(v32i8 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v32i8(<32 x i8>* noalias sret %{{.*}}, <32 x i8>*)
+
+v1i16 pass_v1i16(v1i16 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1i16(<1 x i16>* noalias sret %{{.*}}, <1 x i16>*)
+
+v2i16 pass_v2i16(v2i16 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v2i16(<2 x i16>* noalias sret %{{.*}}, <2 x i16>*)
+
+v4i16 pass_v4i16(v4i16 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v4i16(<4 x i16>* noalias sret %{{.*}}, <4 x i16>*)
+
+v8i16 pass_v8i16(v8i16 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v8i16(<8 x i16>* noalias sret %{{.*}}, <8 x i16>*)
+
+v1i32 pass_v1i32(v1i32 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1i32(<1 x i32>* noalias sret %{{.*}}, <1 x i32>*)
+
+v2i32 pass_v2i32(v2i32 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v2i32(<2 x i32>* noalias sret %{{.*}}, <2 x i32>*)
+
+v4i32 pass_v4i32(v4i32 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v4i32(<4 x i32>* noalias sret %{{.*}}, <4 x i32>*)
+
+v1i64 pass_v1i64(v1i64 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1i64(<1 x i64>* noalias sret %{{.*}}, <1 x i64>*)
+
+v2i64 pass_v2i64(v2i64 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v2i64(<2 x i64>* noalias sret %{{.*}}, <2 x i64>*)
+
+v1i128 pass_v1i128(v1i128 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1i128(<1 x i128>* noalias sret %{{.*}}, <1 x i128>*)
+
+v1f32 pass_v1f32(v1f32 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1f32(<1 x float>* noalias sret %{{.*}}, <1 x float>*)
+
+v2f32 pass_v2f32(v2f32 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v2f32(<2 x float>* noalias sret %{{.*}}, <2 x float>*)
+
+v4f32 pass_v4f32(v4f32 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v4f32(<4 x float>* noalias sret %{{.*}}, <4 x float>*)
+
+v1f64 pass_v1f64(v1f64 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1f64(<1 x double>* noalias sret %{{.*}}, <1 x double>*)
+
+v2f64 pass_v2f64(v2f64 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v2f64(<2 x double>* noalias sret %{{.*}}, <2 x double>*)
+
+v1f128 pass_v1f128(v1f128 arg) { return arg; }
+// CHECK-LABEL: define void @pass_v1f128(<1 x fp128>* noalias sret %{{.*}}, <1 x fp128>*)
+
+
+// Accessing variable argument lists
+
+v1i8 va_v1i8(__builtin_va_list l) { return __builtin_va_arg(l, v1i8); }
+// CHECK-LABEL: define void @va_v1i8(<1 x i8>* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load <1 x i8>*
+
+v2i8 va_v2i8(__builtin_va_list l) { return __builtin_va_arg(l, v2i8); }
+// CHECK-LABEL: define void @va_v2i8(<2 x i8>* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load <2 x i8>*
+
+v4i8 va_v4i8(__builtin_va_list l) { return __builtin_va_arg(l, v4i8); }
+// CHECK-LABEL: define void @va_v4i8(<4 x i8>* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load <4 x i8>*
+
+v8i8 va_v8i8(__builtin_va_list l) { return __builtin_va_arg(l, v8i8); }
+// CHECK-LABEL: define void @va_v8i8(<8 x i8>* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load <8 x i8>*
+
+v16i8 va_v16i8(__builtin_va_list l) { return __builtin_va_arg(l, v16i8); }
+// CHECK-LABEL: define void @va_v16i8(<16 x i8>* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load <16 x i8>*
+
+v32i8 va_v32i8(__builtin_va_list l) { return __builtin_va_arg(l, v32i8); }
+// CHECK-LABEL: define void @va_v32i8(<32 x i8>* noalias sret %{{.*}}, %struct.__va_list_tag* %{{.*}})
+// CHECK: %reg_offset = add i64 %scaled_reg_count, 16
+// CHECK: %raw_mem_addr = getelementptr i8* %overflow_arg_area, i64 0
+// CHECK: %indirect_arg = load <32 x i8>*
+
Index: tools/clang/test/CodeGen/systemz-abi.cpp
===================================================================
--- /dev/null
+++ tools/clang/test/CodeGen/systemz-abi.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -triple s390x-linux-gnu -emit-llvm -x c++ -o - %s | FileCheck %s
+
+// For compatibility with GCC, this structure is passed in an FPR in C++,
+// but passed in a GPR in C (checked in systemz-abi.c).
+
+struct agg_float_cpp { float a; int : 0; };
+struct agg_float_cpp pass_agg_float_cpp(struct agg_float_cpp arg) { return arg; }
+// CHECK-LABEL: define void @_Z18pass_agg_float_cpp13agg_float_cpp(%struct.agg_float_cpp* noalias sret %{{.*}}, float %{{.*}})
+
Index: tools/clang/lib/CodeGen/TargetInfo.cpp
===================================================================
--- tools/clang/lib/CodeGen/TargetInfo.cpp.orig
+++ tools/clang/lib/CodeGen/TargetInfo.cpp
@@ -4606,7 +4606,9 @@ bool SystemZABIInfo::isPromotableInteger
 }
 
 bool SystemZABIInfo::isCompoundType(QualType Ty) const {
-  return Ty->isAnyComplexType() || isAggregateTypeForABI(Ty);
+  return (Ty->isAnyComplexType() ||
+          Ty->isVectorType() ||
+          isAggregateTypeForABI(Ty));
 }
 
 bool SystemZABIInfo::isFPArgumentType(QualType Ty) const {
@@ -4645,11 +4647,12 @@ bool SystemZABIInfo::isFPArgumentType(Qu
            E = RD->field_end(); I != E; ++I) {
       const FieldDecl *FD = *I;
 
-      // Empty bitfields don't affect things either way.
+      // For compatibility with GCC, ignore empty bitfields in C++ mode.
       // Unlike isSingleElementStruct(), empty structure and array fields
       // do count.  So do anonymous bitfields that aren't zero-sized.
-      if (FD->isBitField() && FD->getBitWidthValue(getContext()) == 0)
-        return true;
+      if (getContext().getLangOpts().CPlusPlus &&
+          FD->isBitField() && FD->getBitWidthValue(getContext()) == 0)
+        continue;
 
       // Unlike isSingleElementStruct(), arrays do not count.
       // Nested isFPArgumentType structures still do though.
@@ -4681,17 +4684,21 @@ llvm::Value *SystemZABIInfo::EmitVAArg(l
   // Every argument occupies 8 bytes and is passed by preference in either
   // GPRs or FPRs.
   Ty = CGF.getContext().getCanonicalType(Ty);
+  llvm::Type *ArgTy = CGF.ConvertTypeForMem(Ty);
+  llvm::Type *APTy = llvm::PointerType::getUnqual(ArgTy);
   ABIArgInfo AI = classifyArgumentType(Ty);
-  bool InFPRs = isFPArgumentType(Ty);
-
-  llvm::Type *APTy = llvm::PointerType::getUnqual(CGF.ConvertTypeForMem(Ty));
   bool IsIndirect = AI.isIndirect();
+  bool InFPRs = false;
   unsigned UnpaddedBitSize;
   if (IsIndirect) {
     APTy = llvm::PointerType::getUnqual(APTy);
     UnpaddedBitSize = 64;
-  } else
+  } else {
+    if (AI.getCoerceToType())
+      ArgTy = AI.getCoerceToType();
+    InFPRs = ArgTy->isFloatTy() || ArgTy->isDoubleTy();
     UnpaddedBitSize = getContext().getTypeSize(Ty);
+  }
   unsigned PaddedBitSize = 64;
   assert((UnpaddedBitSize <= PaddedBitSize) && "Invalid argument size.");

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File backport-clang-r233543 of Package llvm.7809

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