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to function calls, we would emit dead code, like this: int Y(int, short, double); int X() { Y(4, 123, 4); } --- Old X: sub %ESP, 20 mov %EAX, 4 mov DWORD PTR [%ESP], %EAX *** mov %AX, 123 mov %AX, 123 movsx %EAX, %AX mov DWORD PTR [%ESP + 4], %EAX fld QWORD PTR [.CPIX_0] fstp QWORD PTR [%ESP + 8] call Y mov %EAX, 0 # IMPLICIT_USE %EAX %ESP add %ESP, 20 ret Now we emit: X: sub %ESP, 20 mov %EAX, 4 mov DWORD PTR [%ESP], %EAX mov %AX, 123 movsx %EAX, %AX mov DWORD PTR [%ESP + 4], %EAX fld QWORD PTR [.CPIX_0] fstp QWORD PTR [%ESP + 8] call Y mov %EAX, 0 # IMPLICIT_USE %EAX %ESP add %ESP, 20 ret Next up, eliminate the mov AX and movsx entirely! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12026 91177308-0d34-0410-b5e6-96231b3b80d8 |
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