[llvm] r182924 - [NVPTX] Fix case where a sext load of an i1 type may produce an

[Justin Holewinski]

Author: jholewinski
Date: Thu May 30 07:22:39 2013
New Revision: 182924

URL: http://llvm.org/viewvc/llvm-project?rev=182924&view=rev
Log:
[NVPTX] Fix case where a sext load of an i1 type may produce an
ld.u1 instead of an ld.u8.

Added:
    llvm/trunk/test/CodeGen/NVPTX/load-sext-i1.ll
Modified:
    llvm/trunk/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp

Modified: llvm/trunk/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp?rev=182924&r1=182923&r2=182924&view=diff
==============================================================================
--- llvm/trunk/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp (original)
+++ llvm/trunk/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp Thu May 30 07:22:39 2013
@@ -205,7 +205,8 @@ SDNode *NVPTXDAGToDAGISel::SelectLoad(SD
   //          type is integer
   // Float  : ISD::NON_EXTLOAD or ISD::EXTLOAD and the type is float
   MVT ScalarVT = SimpleVT.getScalarType();
-  unsigned fromTypeWidth = ScalarVT.getSizeInBits();
+  // Read at least 8 bits (predicates are stored as 8-bit values)
+  unsigned fromTypeWidth = std::max(8U, ScalarVT.getSizeInBits());
   unsigned int fromType;
   if ((LD->getExtensionType() == ISD::SEXTLOAD))
     fromType = NVPTX::PTXLdStInstCode::Signed;
@@ -430,7 +431,8 @@ SDNode *NVPTXDAGToDAGISel::SelectLoadVec
   //          type is integer
   // Float  : ISD::NON_EXTLOAD or ISD::EXTLOAD and the type is float
   MVT ScalarVT = SimpleVT.getScalarType();
-  unsigned FromTypeWidth = ScalarVT.getSizeInBits();
+  // Read at least 8 bits (predicates are stored as 8-bit values)
+  unsigned FromTypeWidth = std::max(8U, ScalarVT.getSizeInBits());
   unsigned int FromType;
   // The last operand holds the original LoadSDNode::getExtensionType() value
   unsigned ExtensionType = cast<ConstantSDNode>(

Added: llvm/trunk/test/CodeGen/NVPTX/load-sext-i1.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/NVPTX/load-sext-i1.ll?rev=182924&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/NVPTX/load-sext-i1.ll (added)
+++ llvm/trunk/test/CodeGen/NVPTX/load-sext-i1.ll Thu May 30 07:22:39 2013
@@ -0,0 +1,14 @@
+; RUN: llc < %s -march=nvptx -mcpu=sm_20 -drvcuda | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
+
+
+define void @main(i1* %a1, i32 %a2, i32* %arg3) {
+; CHECK: ld.u8
+; CHECK-NOT: ld.u1
+  %t1 = getelementptr i1* %a1, i32 %a2
+  %t2 = load i1* %t1
+  %t3 = sext i1 %t2 to i32
+  store i32 %t3, i32* %arg3
+  ret void
+}