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int %test_cpuid(int %op) { %B = alloca int %C = alloca int %D = alloca int %A = call int asm "cpuid", "=eax,==ebx,==ecx,==edx,eax"(int* %B, int* %C, int* %D, int %op) %Bv = load int* %B %Cv = load int* %C %Dv = load int* %D %x = add int %A, %Bv %y = add int %x, %Cv %z = add int %y, %Dv ret int %z } to this: _test_cpuid: sub %ESP, 16 mov DWORD PTR [%ESP], %EBX mov %EAX, DWORD PTR [%ESP + 20] cpuid mov DWORD PTR [%ESP + 8], %ECX mov DWORD PTR [%ESP + 12], %EBX mov DWORD PTR [%ESP + 4], %EDX mov %ECX, DWORD PTR [%ESP + 12] add %EAX, %ECX mov %ECX, DWORD PTR [%ESP + 8] add %EAX, %ECX mov %ECX, DWORD PTR [%ESP + 4] add %EAX, %ECX mov %EBX, DWORD PTR [%ESP] add %ESP, 16 ret ... note the proper register allocation. :) it is unclear to me why the loads aren't folded into the adds. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25827 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
SelectionDAG | ||
AsmPrinter.cpp | ||
BranchFolding.cpp | ||
DwarfWriter.cpp | ||
ELFWriter.cpp | ||
IntrinsicLowering.cpp | ||
LiveInterval.cpp | ||
LiveIntervalAnalysis.cpp | ||
LiveVariables.cpp | ||
MachineBasicBlock.cpp | ||
MachineCodeEmitter.cpp | ||
MachineDebugInfo.cpp | ||
MachineFunction.cpp | ||
MachineInstr.cpp | ||
Makefile | ||
Passes.cpp | ||
PHIElimination.cpp | ||
PhysRegTracker.h | ||
PrologEpilogInserter.cpp | ||
RegAllocLinearScan.cpp | ||
RegAllocLocal.cpp | ||
RegAllocSimple.cpp | ||
TwoAddressInstructionPass.cpp | ||
UnreachableBlockElim.cpp | ||
VirtRegMap.cpp | ||
VirtRegMap.h |