llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-26 10:29:36 +00:00

History

Chris Lattner 0b7c0bf249 Generalize this transform, using MaskedValueIsZero, allowing us to compile:

struct S { unsigned int i : 6, j : 11, k : 15; } b;
void plus3 (unsigned int x) { b.k += x; }

To:

plus3:
        mov %EAX, DWORD PTR [%ESP + 4]
        shl %EAX, 17
        add DWORD PTR [b], %EAX
        ret

instead of:

plus3:
        mov %EAX, DWORD PTR [%ESP + 4]
        shl %EAX, 17
        mov %ECX, DWORD PTR [b]
        add %EAX, %ECX
        and %EAX, -131072
        and %ECX, 131071
        or %ECX, %EAX
        mov DWORD PTR [b], %ECX
        ret


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23384 91177308-0d34-0410-b5e6-96231b3b80d8

2005-09-18 06:02:59 +00:00

Hello

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Instrumentation

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IPO

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Scalar

Generalize this transform, using MaskedValueIsZero, allowing us to compile:

2005-09-18 06:02:59 +00:00

Utils

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