[PowerPC] Fix small argument stack slot offset for LE

When small arguments (structures < 8 bytes or "float") are passed in a
stack slot in the ppc64 SVR4 ABI, they must reside in the least
significant part of that slot.  On BE, this means that an offset needs
to be added to the stack address of the parameter, but on LE, the least
significant part of the slot has the same address as the slot itself.

For the most part, this is handled in the LLVM back-end, where I just
fixed the LE case in commit r211368.

However, there is one piece of the clang front-end that is also aware of
these stack-slot offsets: PPC64_SVR4_ABIInfo::EmitVAArg.  This patch
updates that routine to take endianness into account.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211370 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 69 insertions, 0 deletions

diff --git a/test/CodeGen/ppc64le-varargs-complex.c b/test/CodeGen/ppc64le-varargs-complex.c
new file mode 100644
index 0000000000..b89f462c38
--- /dev/null
+++ b/test/CodeGen/ppc64le-varargs-complex.c
@@ -0,0 +1,69 @@
+// REQUIRES: powerpc-registered-target
+// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s
+
+#include <stdarg.h>
+
+void testva (int n, ...)
+{
+  va_list ap;
+
+  _Complex int i   = va_arg(ap, _Complex int);
+  // CHECK: %[[VAR40:[A-Za-z0-9.]+]] = load i8** %[[VAR100:[A-Za-z0-9.]+]]
+  // CHECK-NEXT: %[[VAR41:[A-Za-z0-9.]+]] = getelementptr i8* %[[VAR40]], i64 16
+  // CHECK-NEXT: store i8* %[[VAR41]], i8** %[[VAR100]]
+  // CHECK-NEXT: %[[VAR1:[A-Za-z0-9.]+]] = ptrtoint i8* %[[VAR40]] to i64
+  // CHECK-NEXT: %[[VAR3:[A-Za-z0-9.]+]] = add i64 %[[VAR1]], 8
+  // CHECK-NEXT: %[[VAR4:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR1]] to i32*
+  // CHECK-NEXT: %[[VAR5:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR3]] to i32*
+  // CHECK-NEXT: %[[VAR6:[A-Za-z0-9.]+]] = load i32* %[[VAR4]]
+  // CHECK-NEXT: %[[VAR7:[A-Za-z0-9.]+]] = load i32* %[[VAR5]]
+  // CHECK-NEXT: %[[VAR8:[A-Za-z0-9.]+]] = getelementptr inbounds { i32, i32 }* %[[VAR0:[A-Za-z0-9.]+]], i32 0, i32 0
+  // CHECK-NEXT: %[[VAR9:[A-Za-z0-9.]+]] = getelementptr inbounds { i32, i32 }* %[[VAR0]], i32 0, i32 1
+  // CHECK-NEXT: store i32 %[[VAR6]], i32* %[[VAR8]]
+  // CHECK-NEXT: store i32 %[[VAR7]], i32* %[[VAR9]]
+
+  _Complex short s = va_arg(ap, _Complex short);
+  // CHECK: %[[VAR50:[A-Za-z0-9.]+]] = load i8** %[[VAR100:[A-Za-z0-9.]+]]
+  // CHECK-NEXT: %[[VAR51:[A-Za-z0-9.]+]] = getelementptr i8* %[[VAR50]], i64 16
+  // CHECK-NEXT: store i8* %[[VAR51]], i8** %[[VAR100]]
+  // CHECK: %[[VAR11:[A-Za-z0-9.]+]] = ptrtoint i8* %{{[A-Za-z0-9.]+}} to i64
+  // CHECK-NEXT: %[[VAR13:[A-Za-z0-9.]+]] = add i64 %[[VAR11]], 8
+  // CHECK-NEXT: %[[VAR14:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR11]] to i16*
+  // CHECK-NEXT: %[[VAR15:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR13]] to i16*
+  // CHECK-NEXT: %[[VAR16:[A-Za-z0-9.]+]] = load i16* %[[VAR14]]
+  // CHECK-NEXT: %[[VAR17:[A-Za-z0-9.]+]] = load i16* %[[VAR15]]
+  // CHECK-NEXT: %[[VAR18:[A-Za-z0-9.]+]] = getelementptr inbounds { i16, i16 }* %[[VAR10:[A-Za-z0-9.]+]], i32 0, i32 0
+  // CHECK-NEXT: %[[VAR19:[A-Za-z0-9.]+]] = getelementptr inbounds { i16, i16 }* %[[VAR10]], i32 0, i32 1
+  // CHECK-NEXT: store i16 %[[VAR16]], i16* %[[VAR18]]
+  // CHECK-NEXT: store i16 %[[VAR17]], i16* %[[VAR19]]
+
+  _Complex char c  = va_arg(ap, _Complex char);
+  // CHECK: %[[VAR60:[A-Za-z0-9.]+]] = load i8** %[[VAR100:[A-Za-z0-9.]+]]
+  // CHECK-NEXT: %[[VAR61:[A-Za-z0-9.]+]] = getelementptr i8* %[[VAR60]], i64 16
+  // CHECK-NEXT: store i8* %[[VAR61]], i8** %[[VAR100]]
+  // CHECK: %[[VAR21:[A-Za-z0-9.]+]] = ptrtoint i8* %{{[A-Za-z0-9.]+}} to i64
+  // CHECK-NEXT: %[[VAR23:[A-Za-z0-9.]+]] = add i64 %[[VAR21]], 8
+  // CHECK-NEXT: %[[VAR24:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR21]] to i8*
+  // CHECK-NEXT: %[[VAR25:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR23]] to i8*
+  // CHECK-NEXT: %[[VAR26:[A-Za-z0-9.]+]] = load i8* %[[VAR24]]
+  // CHECK-NEXT: %[[VAR27:[A-Za-z0-9.]+]] = load i8* %[[VAR25]]
+  // CHECK-NEXT: %[[VAR28:[A-Za-z0-9.]+]] = getelementptr inbounds { i8, i8 }* %[[VAR20:[A-Za-z0-9.]+]], i32 0, i32 0
+  // CHECK-NEXT: %[[VAR29:[A-Za-z0-9.]+]] = getelementptr inbounds { i8, i8 }* %[[VAR20]], i32 0, i32 1
+  // CHECK-NEXT: store i8 %[[VAR26]], i8* %[[VAR28]]
+  // CHECK-NEXT: store i8 %[[VAR27]], i8* %[[VAR29]]
+
+  _Complex float f = va_arg(ap, _Complex float);
+  // CHECK: %[[VAR70:[A-Za-z0-9.]+]] = load i8** %[[VAR100:[A-Za-z0-9.]+]]
+  // CHECK-NEXT: %[[VAR71:[A-Za-z0-9.]+]] = getelementptr i8* %[[VAR70]], i64 16
+  // CHECK-NEXT: store i8* %[[VAR71]], i8** %[[VAR100]]
+  // CHECK: %[[VAR31:[A-Za-z0-9.]+]] = ptrtoint i8* %{{[A-Za-z0-9.]+}} to i64
+  // CHECK-NEXT: %[[VAR33:[A-Za-z0-9.]+]] = add i64 %[[VAR31]], 8
+  // CHECK-NEXT: %[[VAR34:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR31]] to float*
+  // CHECK-NEXT: %[[VAR35:[A-Za-z0-9.]+]] = inttoptr i64 %[[VAR33]] to float*
+  // CHECK-NEXT: %[[VAR36:[A-Za-z0-9.]+]] = load float* %[[VAR34]]
+  // CHECK-NEXT: %[[VAR37:[A-Za-z0-9.]+]] = load float* %[[VAR35]]
+  // CHECK-NEXT: %[[VAR38:[A-Za-z0-9.]+]] = getelementptr inbounds { float, float }* %[[VAR30:[A-Za-z0-9.]+]], i32 0, i32 0
+  // CHECK-NEXT: %[[VAR39:[A-Za-z0-9.]+]] = getelementptr inbounds { float, float }* %[[VAR30]], i32 0, i32 1
+  // CHECK-NEXT: store float %[[VAR36]], float* %[[VAR38]]
+  // CHECK-NEXT: store float %[[VAR37]], float* %[[VAR39]]
+}