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Revert. This isn't the correct way to go.

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llvm-svn: 108478
This commit is contained in:
Bill Wendling 2010-07-15 23:42:21 +00:00
parent 1705ac2740
commit 756b0a4d45
4 changed files with 4 additions and 27 deletions
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14
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -796,7 +796,6 @@ void SelectionDAGBuilder::visit(unsigned Opcode, const User &I) {
#define HANDLE_INST(NUM, OPCODE, CLASS) \
case Instruction::OPCODE: visit##OPCODE((CLASS&)I); break;
#include "llvm/Instruction.def"
#undef HANDLE_INST
}
// Assign the ordering to the freshly created DAG nodes.
@ -2195,19 +2194,6 @@ void SelectionDAGBuilder::visitIndirectBr(const IndirectBrInst &I) {
getValue(I.getAddress())));
}
void SelectionDAGBuilder::visitUnreachable(const UnreachableInst &I) {
// If the function consists of a single "unreachable" instruction, emit a
// "trap". This prevents the back-ends from generating empty functions or
// functions which have a prologue, but no epilogue.
const BasicBlock *BB = I.getParent();
const Function *F = BB->getParent();
if (F->size() == 1 && BB->size() == 1 &&
isa<UnreachableInst>(BB->getTerminator()))
DAG.setRoot(DAG.getNode(ISD::TRAP, getCurDebugLoc(),
MVT::Other, getRoot()));
}
void SelectionDAGBuilder::visitFSub(const User &I) {
// -0.0 - X --> fneg
const Type *Ty = I.getType();

2
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
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@ -385,7 +385,7 @@ private:
void visitBr(const BranchInst &I);
void visitSwitch(const SwitchInst &I);
void visitIndirectBr(const IndirectBrInst &I);
void visitUnreachable(const UnreachableInst &I);
void visitUnreachable(const UnreachableInst &I) { /* noop */ }
// Helpers for visitSwitch
bool handleSmallSwitchRange(CaseRec& CR,

2
test/CodeGen/PowerPC/2008-01-25-EmptyFunction.ll
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@ -1,4 +1,4 @@
; RUN: llc < %s -march=ppc32 | grep trap
; RUN: llc < %s -march=ppc32 | grep nop
target triple = "powerpc-apple-darwin8"

13
test/CodeGen/X86/2008-01-25-EmptyFunction.ll
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@ -1,17 +1,8 @@
; RUN: llc < %s -march=x86 | FileCheck -check-prefix=NO-FP %s
; RUN: llc < %s -march=x86 -disable-fp-elim | FileCheck -check-prefix=FP %s
; RUN: llc < %s -march=x86 | grep nop
target triple = "i686-apple-darwin8"
define void @func1() noreturn nounwind {
entry:
; NO-FP: ud2
unreachable
}
define void @func2() noreturn nounwind {
define void @bork() noreturn nounwind {
entry:
; FP: pushl %ebp
; FP: movl %esp, %ebp
; FP: ud2
unreachable
}