[AIX] Let alloca return 16 bytes alignment

On AIX, to support vector types, which should always be 16 bytes aligned,
we set alloca to return 16 bytes aligned memory space.

Differential Revision: https://reviews.llvm.org/D89910

diff --git a/clang/lib/Basic/Targets/PPC.h b/clang/lib/Basic/Targets/PPC.h
index 5975082..ad75446 100644 (file)
--- a/clang/lib/Basic/Targets/PPC.h
+++ b/clang/lib/Basic/Targets/PPC.h
@@ -370,7 +370,6 @@ public:
       SizeType = UnsignedLong;
       PtrDiffType = SignedLong;
       IntPtrType = SignedLong;
-      SuitableAlign = 64;
       LongDoubleWidth = 64;
       LongDoubleAlign = DoubleAlign = 32;
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();
@@ -409,7 +408,6 @@ public:
     if (Triple.isOSAIX()) {
       // TODO: Set appropriate ABI for AIX platform.
       DataLayout = "E-m:a-i64:64-n32:64";
-      SuitableAlign = 64;
       LongDoubleWidth = 64;
       LongDoubleAlign = DoubleAlign = 32;
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();

diff --git a/clang/test/CodeGen/aix_alloca_align.c b/clang/test/CodeGen/aix_alloca_align.c
new file mode 100644 (file)
index 0000000..e235abd
--- /dev/null
+++ b/clang/test/CodeGen/aix_alloca_align.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple=powerpc-ibm-aix-xcoff -S -emit-llvm < %s | \
+// RUN:   FileCheck --check-prefix=32BIT %s
+
+// RUN: %clang_cc1 -triple=powerpc64-ibm-aix-xcoff -S -emit-llvm < %s | \
+// RUN:   FileCheck --check-prefix=64BIT %s
+
+typedef __SIZE_TYPE__ size_t;
+extern void *alloca(size_t __size) __attribute__((__nothrow__));
+
+void foo() {
+  char *ptr1 = (char *)alloca(sizeof(char) * 9);
+  char *ptr2 = (char *)alloca(sizeof(char) * 32);
+}
+
+// 32BIT: %0 = alloca i8, i32 9, align 16
+// 32BIT: %1 = alloca i8, i32 32, align 16
+
+// 64BIT: %0 = alloca i8, i64 9, align 16
+// 64BIT: %1 = alloca i8, i64 32, align 16

diff --git a/clang/test/Preprocessor/init-ppc.c b/clang/test/Preprocessor/init-ppc.c
index 2757576..aa0f8c9 100644 (file)
--- a/clang/test/Preprocessor/init-ppc.c
+++ b/clang/test/Preprocessor/init-ppc.c
@@ -398,7 +398,7 @@
 // PPC-AIX:#define _LONG_LONG 1
 // PPC-AIX-NOT:#define _LP64 1
 // PPC-AIX:#define _POWER 1
-// PPC-AIX:#define __BIGGEST_ALIGNMENT__ 8
+// PPC-AIX:#define __BIGGEST_ALIGNMENT__ 16
 // PPC-AIX:#define __BIG_ENDIAN__ 1
 // PPC-AIX:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC-AIX:#define __CHAR16_TYPE__ unsigned short

diff --git a/clang/test/Preprocessor/init-ppc64.c b/clang/test/Preprocessor/init-ppc64.c
index b553d07..dd965b8 100644 (file)
--- a/clang/test/Preprocessor/init-ppc64.c
+++ b/clang/test/Preprocessor/init-ppc64.c
@@ -666,7 +666,7 @@
 // PPC64-AIX:#define _LP64 1
 // PPC64-AIX:#define _POWER 1
 // PPC64-AIX:#define __64BIT__ 1
-// PPC64-AIX:#define __BIGGEST_ALIGNMENT__ 8
+// PPC64-AIX:#define __BIGGEST_ALIGNMENT__ 16
 // PPC64-AIX:#define __BIG_ENDIAN__ 1
 // PPC64-AIX:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
 // PPC64-AIX:#define __CHAR16_TYPE__ unsigned short