[llvm] r187497 - [SystemZ] Implement isLegalAddressingMode()
Richard Sandiford
rsandifo at linux.vnet.ibm.com
Wed Jul 31 05:58:26 PDT 2013
Author: rsandifo
Date: Wed Jul 31 07:58:26 2013
New Revision: 187497
URL: http://llvm.org/viewvc/llvm-project?rev=187497&view=rev
Log:
[SystemZ] Implement isLegalAddressingMode()
The loop optimizers were assuming that scales > 1 were OK. I think this
is actually a bug in TargetLoweringBase::isLegalAddressingMode(),
since it seems to be trying to reject anything that isn't r+i or r+r,
but it has no default case for scales other than 0, 1 or 2. Implementing
the hook for z means that z can no longer test any change there though.
Added:
llvm/trunk/test/CodeGen/SystemZ/loop-01.ll
Modified:
llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.cpp
llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.h
Modified: llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.cpp?rev=187497&r1=187496&r2=187497&view=diff
==============================================================================
--- llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.cpp Wed Jul 31 07:58:26 2013
@@ -290,6 +290,21 @@ bool SystemZTargetLowering::allowsUnalig
return true;
}
+bool SystemZTargetLowering::isLegalAddressingMode(const AddrMode &AM,
+ Type *Ty) const {
+ // Punt on globals for now, although they can be used in limited
+ // RELATIVE LONG cases.
+ if (AM.BaseGV)
+ return false;
+
+ // Require a 20-bit signed offset.
+ if (!isInt<20>(AM.BaseOffs))
+ return false;
+
+ // Indexing is OK but no scale factor can be applied.
+ return AM.Scale == 0 || AM.Scale == 1;
+}
+
//===----------------------------------------------------------------------===//
// Inline asm support
//===----------------------------------------------------------------------===//
Modified: llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.h?rev=187497&r1=187496&r2=187497&view=diff
==============================================================================
--- llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.h (original)
+++ llvm/trunk/lib/Target/SystemZ/SystemZISelLowering.h Wed Jul 31 07:58:26 2013
@@ -126,12 +126,15 @@ public:
virtual MVT getScalarShiftAmountTy(EVT LHSTy) const LLVM_OVERRIDE {
return MVT::i32;
}
- virtual EVT getSetCCResultType(LLVMContext &, EVT) const {
+ virtual EVT getSetCCResultType(LLVMContext &, EVT) const LLVM_OVERRIDE {
return MVT::i32;
}
virtual bool isFMAFasterThanFMulAndFAdd(EVT VT) const LLVM_OVERRIDE;
- virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
- virtual bool allowsUnalignedMemoryAccesses(EVT VT, bool *Fast) const;
+ virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const LLVM_OVERRIDE;
+ virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const
+ LLVM_OVERRIDE;
+ virtual bool allowsUnalignedMemoryAccesses(EVT VT, bool *Fast) const
+ LLVM_OVERRIDE;
virtual const char *getTargetNodeName(unsigned Opcode) const LLVM_OVERRIDE;
virtual std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const std::string &Constraint,
Added: llvm/trunk/test/CodeGen/SystemZ/loop-01.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/SystemZ/loop-01.ll?rev=187497&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/SystemZ/loop-01.ll (added)
+++ llvm/trunk/test/CodeGen/SystemZ/loop-01.ll Wed Jul 31 07:58:26 2013
@@ -0,0 +1,25 @@
+; Test loop tuning.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
+
+; Test that strength reduction is applied to addresses with a scale factor,
+; but that indexed addressing can still be used.
+define void @f1(i32 *%dest, i32 %a) {
+; CHECK-LABEL: f1
+; CHECK-NOT: sllg
+; CHECK: st %r3, 0({{%r[1-5],%r[1-5]}})
+; CHECK: br %r14
+entry:
+ br label %loop
+
+loop:
+ %index = phi i64 [ 0, %entry ], [ %next, %loop ]
+ %ptr = getelementptr i32 *%dest, i64 %index
+ store i32 %a, i32 *%ptr
+ %next = add i64 %index, 1
+ %cmp = icmp ne i64 %next, 100
+ br i1 %cmp, label %loop, label %exit
+
+exit:
+ ret void
+}
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