From: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Fri, 12 Feb 2016 14:48:34 +0000 (+0000)
Subject: [Hexagon] Specify vector alignment in DataLayout string
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8148f06ebc11112332b5c256b27a561a63b27c11;p=clang

[Hexagon] Specify vector alignment in DataLayout string

The DataLayout can calculate alignment of vectors based on the alignment
of the element type and the number of elements. In fact, it is the product
of these two values. The problem is that for vectors of N x i1, this will
return the alignment of N bytes, since the alignment of i1 is 8 bits. The
vector types of vNi1 should be aligned to N bits instead. Provide explicit
alignment for HVX vectors to avoid such complications.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260680 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 2651cfe4ef..aea14306c7 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -5697,9 +5697,12 @@ class HexagonTargetInfo : public TargetInfo {
 public:
   HexagonTargetInfo(const llvm::Triple &Triple) : TargetInfo(Triple) {
     BigEndian = false;
-    DataLayoutString = "e-m:e-p:32:32:32-"
-                       "i64:64:64-i32:32:32-i16:16:16-i1:8:8-"
-                       "f64:64:64-f32:32:32-v64:64:64-v32:32:32-a:0-n16:32";
+    // Specify the vector alignment explicitly. For v512x1, the calculated
+    // alignment would be 512*alignment(i1), which is 512 bytes, instead of
+    // the required minimum of 64 bytes.
+    DataLayoutString = "e-m:e-p:32:32:32-a:0-n16:32-"
+        "i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-"
+        "v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048";
     SizeType    = UnsignedInt;
     PtrDiffType = SignedInt;
     IntPtrType  = SignedInt;
diff --git a/test/CodeGen/target-data.c b/test/CodeGen/target-data.c
index 2ed7f0916f..a2c02be949 100644
--- a/test/CodeGen/target-data.c
+++ b/test/CodeGen/target-data.c
@@ -157,7 +157,7 @@
 
 // RUN: %clang_cc1 -triple hexagon-unknown -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=HEXAGON
-// HEXAGON: target datalayout = "e-m:e-p:32:32:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f64:64:64-f32:32:32-v64:64:64-v32:32:32-a:0-n16:32"
+// HEXAGON: target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
 
 // RUN: %clang_cc1 -triple s390x-unknown -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=SYSTEMZ