Inline Assembly: Difference between revisions
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These labels are in a namespace of their own, and will not collide with any C identifiers. The same can be done for input operands, too. |
These labels are in a namespace of their own, and will not collide with any C identifiers. The same can be done for input operands, too. |
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Input Operands |
==Input Operands== |
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The Input Operands allow to parameterize the ASM code; i.e., passing parameters from C code to ASM block. Again, string literals are used to specify the details. |
The Input Operands allow to parameterize the ASM code; i.e., passing parameters from C code to ASM block. Again, string literals are used to specify the details. |
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The correct thing to do when input operands are written to is to list them as dummy outputs (instead of trying to list them as clobbers). |
The correct thing to do when input operands are written to is to list them as dummy outputs (instead of trying to list them as clobbers). |
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Here is a simple example: |
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<pre> |
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asm("mov %%eax,%%ebx": : "a" (amount));//useless but it gets the idea |
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</pre> |
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Eax will contain "amount" and be moved into ebx. |
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==Clobbered Registers List== |
==Clobbered Registers List== |
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