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long %test(long %X) { %Y = mul long %X, 123 ret long %Y } we used to generate: test: sub %ESP, 12 mov DWORD PTR [%ESP + 8], %ESI mov DWORD PTR [%ESP + 4], %EDI mov DWORD PTR [%ESP], %EBX mov %ECX, DWORD PTR [%ESP + 16] mov %ESI, DWORD PTR [%ESP + 20] mov %EDI, 123 mov %EBX, 0 mov %EAX, %ECX mul %EDI imul %ESI, %EDI add %ESI, %EDX imul %ECX, %EBX add %ESI, %ECX mov %EDX, %ESI mov %EBX, DWORD PTR [%ESP] mov %EDI, DWORD PTR [%ESP + 4] mov %ESI, DWORD PTR [%ESP + 8] add %ESP, 12 ret Now we emit: test: mov %EAX, DWORD PTR [%ESP + 4] mov %ECX, DWORD PTR [%ESP + 8] mov %EDX, 123 mul %EDX imul %ECX, %ECX, 123 add %ECX, %EDX mov %EDX, %ECX ret Which, incidently, is substantially nicer than what GCC manages: T: sub %esp, 8 mov %eax, 123 mov DWORD PTR [%esp], %ebx mov %ebx, DWORD PTR [%esp+16] mov DWORD PTR [%esp+4], %esi mov %esi, DWORD PTR [%esp+12] imul %ecx, %ebx, 123 mov %ebx, DWORD PTR [%esp] mul %esi mov %esi, DWORD PTR [%esp+4] add %esp, 8 lea %edx, [%ecx+%edx] ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12692 91177308-0d34-0410-b5e6-96231b3b80d8 |
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