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c38c1d135c
llvm/test
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Bill Schmidt c38c1d135c Index: test/CodeGen/PowerPC/reloc-align.ll 
===================================================================
--- test/CodeGen/PowerPC/reloc-align.ll	(revision 0)
+++ test/CodeGen/PowerPC/reloc-align.ll	(revision 0)
@@ -0,0 +1,34 @@
+; RUN: llc -mcpu=pwr7 -O1 < %s | FileCheck %s
+
+; This test verifies that the peephole optimization of address accesses
+; does not produce a load or store with a relocation that can't be
+; satisfied for a given instruction encoding.  Reduced from a test supplied
+; by Hal Finkel.
+
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+%struct.S1 = type { [8 x i8] }
+
+@main.l_1554 = internal global { i8, i8, i8, i8, i8, i8, i8, i8 } { i8 -1, i8 -6, i8 57, i8 62, i8 -48, i8 0, i8 58, i8 80 }, align 1
+
+; Function Attrs: nounwind readonly
+define signext i32 @main() #0 {
+entry:
+  %call = tail call fastcc signext i32 @func_90(%struct.S1* byval bitcast ({ i8, i8, i8, i8, i8, i8, i8, i8 }* @main.l_1554 to %struct.S1*))
+; CHECK-NOT: ld {{[0-9]+}}, main.l_1554@toc@l
+  ret i32 %call
+}
+
+; Function Attrs: nounwind readonly
+define internal fastcc signext i32 @func_90(%struct.S1* byval nocapture %p_91) #0 {
+entry:
+  %0 = bitcast %struct.S1* %p_91 to i64*
+  %bf.load = load i64* %0, align 1
+  %bf.shl = shl i64 %bf.load, 26
+  %bf.ashr = ashr i64 %bf.shl, 54
+  %bf.cast = trunc i64 %bf.ashr to i32
+  ret i32 %bf.cast
+}
+
+attributes #0 = { nounwind readonly "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
Index: lib/Target/PowerPC/PPCAsmPrinter.cpp
===================================================================
--- lib/Target/PowerPC/PPCAsmPrinter.cpp	(revision 185327)
+++ lib/Target/PowerPC/PPCAsmPrinter.cpp	(working copy)
@@ -679,7 +679,26 @@ void PPCAsmPrinter::EmitInstruction(const MachineI
       OutStreamer.EmitRawText(StringRef("\tmsync"));
       return;
     }
+    break;
+  case PPC::LD:
+  case PPC::STD:
+  case PPC::LWA: {
+    // Verify alignment is legal, so we don't create relocations
+    // that can't be supported.
+    // FIXME:  This test is currently disabled for Darwin.  The test
+    // suite shows a handful of test cases that fail this check for
+    // Darwin.  Those need to be investigated before this sanity test
+    // can be enabled for those subtargets.
+    if (!Subtarget.isDarwin()) {
+      unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
+      const MachineOperand &MO = MI->getOperand(OpNum);
+      if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
+        llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
+    }
+    // Now process the instruction normally.
+    break;
   }
+  }
 
   LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
   OutStreamer.EmitInstruction(TmpInst);
Index: lib/Target/PowerPC/PPCISelDAGToDAG.cpp
===================================================================
--- lib/Target/PowerPC/PPCISelDAGToDAG.cpp	(revision 185327)
+++ lib/Target/PowerPC/PPCISelDAGToDAG.cpp	(working copy)
@@ -1530,6 +1530,14 @@ void PPCDAGToDAGISel::PostprocessISelDAG() {
       if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(ImmOpnd)) {
         SDLoc dl(GA);
         const GlobalValue *GV = GA->getGlobal();
+        // We can't perform this optimization for data whose alignment
+        // is insufficient for the instruction encoding.
+        if (GV->getAlignment() < 4 &&
+            (StorageOpcode == PPC::LD || StorageOpcode == PPC::STD ||
+             StorageOpcode == PPC::LWA)) {
+          DEBUG(dbgs() << "Rejected this candidate for alignment.\n\n");
+          continue;
+        }
         ImmOpnd = CurDAG->getTargetGlobalAddress(GV, dl, MVT::i64, 0, Flags);
       } else if (ConstantPoolSDNode *CP =
                  dyn_cast<ConstantPoolSDNode>(ImmOpnd)) {


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185380 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-01 20:52:27 +00:00
..
Analysis Minimize precision loss when computing cyclic probabilities. 2013-06-28 22:40:43 +00:00
Archive Fix an ordering problem in the test. 2013-06-21 07:23:14 +00:00
Assembler Added support for the Builtin attribute. 2013-06-27 00:25:01 +00:00
Bindings/Ocaml Use the attribute group reference instead of the attribute directly. 2013-02-20 07:48:23 +00:00
Bitcode Unify clang/llvm attributes for asan/tsan/msan (LLVM part) 2013-02-26 06:58:09 +00:00
BugPoint
CodeGen Index: test/CodeGen/PowerPC/reloc-align.ll 2013-07-01 20:52:27 +00:00
DebugInfo llvm-symbolizer: Recognize a drive letter on win32. Then "REQUIRES: shell" can be removed. 2013-07-01 09:51:42 +00:00
ExecutionEngine Enable mcjit tests on ppc64 when building with cmake. 2013-06-03 19:17:21 +00:00
Feature Add a new function attribute 'cold' to functions. 2013-05-24 12:26:52 +00:00
FileCheck Add 'CHECK-DAG' support 2013-05-14 20:34:12 +00:00
Instrumentation [asan] workaround for PR16277: don't instrument AllocaInstr with alignment more than the redzone size 2013-06-26 09:49:52 +00:00
Integer Rewrite test/Integer tests to use FileCheck instead of grep 2013-04-08 20:18:15 +00:00
JitListener Add support for source and line information to IntelJITEventListener for object emitted by MCJIT. 2013-01-28 19:52:37 +00:00
Linker Extend RemapInstruction and friends to take an optional new parameter, a ValueMaterializer. 2013-05-28 15:17:05 +00:00
MC [ARMAsmParser] Sort the ARM register lists based on the encoding value, not the 2013-07-01 20:49:23 +00:00
Object [yaml2obj][ELF] Make symbol table top-level key. 2013-06-22 01:38:00 +00:00
Other (1) Add ".test" to test/Other/lit.local.cfg, so llvm-cov.test is actually run. 2013-07-01 18:58:53 +00:00
TableGen Allow TableGen DAG arguments to be just a name. 2013-03-24 19:36:51 +00:00
tools readobj: Dump PE/COFF optional records. 2013-06-12 19:10:33 +00:00
Transforms LoopVectorize: Math functions only read rounding mode 2013-07-01 00:54:44 +00:00
Unit Propagate path to ASan/MSan symbolizer into test environment to produce useful reports on errors. 2013-04-04 07:41:00 +00:00
Verifier Also verify llvm.compiler_used. 2013-04-22 15:16:51 +00:00
YAMLParser
CMakeLists.txt Add obj2yaml to test dependencies 2013-04-05 07:26:37 +00:00
lit.cfg Suppress llvm/test/Other/can-execute.txt on msys bash. 2013-06-26 10:56:44 +00:00
lit.site.cfg.in Allow host triple to be correctly overridden in CMake builds 2013-05-04 07:36:23 +00:00
Makefile add polly to check-all 2013-05-20 18:49:15 +00:00
Makefile.tests Remove obsolete object file dumpers 2013-04-12 04:07:13 +00:00
TestRunner.sh