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| <a name="Registers-That-Form-a-Stack"></a> |
| <h4 class="subsection">17.7.5 Registers That Form a Stack</h4> |
| |
| <p>There are special features to handle computers where some of the |
| “registers” form a stack. Stack registers are normally written by |
| pushing onto the stack, and are numbered relative to the top of the |
| stack. |
| </p> |
| <p>Currently, GCC can only handle one group of stack-like registers, and |
| they must be consecutively numbered. Furthermore, the existing |
| support for stack-like registers is specific to the 80387 floating |
| point coprocessor. If you have a new architecture that uses |
| stack-like registers, you will need to do substantial work on |
| <samp>reg-stack.c</samp> and write your machine description to cooperate |
| with it, as well as defining these macros. |
| </p> |
| <dl> |
| <dt><a name="index-STACK_005fREGS"></a>Macro: <strong>STACK_REGS</strong></dt> |
| <dd><p>Define this if the machine has any stack-like registers. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-STACK_005fREG_005fCOVER_005fCLASS"></a>Macro: <strong>STACK_REG_COVER_CLASS</strong></dt> |
| <dd><p>This is a cover class containing the stack registers. Define this if |
| the machine has any stack-like registers. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-FIRST_005fSTACK_005fREG"></a>Macro: <strong>FIRST_STACK_REG</strong></dt> |
| <dd><p>The number of the first stack-like register. This one is the top |
| of the stack. |
| </p></dd></dl> |
| |
| <dl> |
| <dt><a name="index-LAST_005fSTACK_005fREG"></a>Macro: <strong>LAST_STACK_REG</strong></dt> |
| <dd><p>The number of the last stack-like register. This one is the bottom of |
| the stack. |
| </p></dd></dl> |
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