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138 lines
6.2 KiB
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<title>MIPS FP ABI Variants (Using as)</title>
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" rel="up" title="MIPS FP ABIs">
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<link href="MIPS-FP-ABI-Selection.html#MIPS-FP-ABI-Selection" rel="next" title="MIPS FP ABI Selection">
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<body lang="en">
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<a name="MIPS-FP-ABI-Variants"></a>
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<div class="header">
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<p>
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Next: <a href="MIPS-FP-ABI-Selection.html#MIPS-FP-ABI-Selection" accesskey="n" rel="next">MIPS FP ABI Selection</a>, Previous: <a href="MIPS-FP-ABI-History.html#MIPS-FP-ABI-History" accesskey="p" rel="prev">MIPS FP ABI History</a>, Up: <a href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" accesskey="u" rel="up">MIPS FP ABIs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Supported-FP-ABIs"></a>
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<h4 class="subsubsection">9.26.9.2 Supported FP ABIs</h4>
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<p>The supported floating-point ABI variants are:
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</p>
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<dl compact="compact">
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<dt><code>0 - No floating-point</code></dt>
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<dd><p>This variant is used to indicate that floating-point is not used within
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the module at all and therefore has no impact on the ABI. This is the
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default.
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</p>
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</dd>
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<dt><code>1 - Double-precision</code></dt>
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<dd><p>This variant indicates that double-precision support is used. For 64-bit
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ABIs this means that 64-bit wide floating-point registers are required.
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For 32-bit ABIs this means that 32-bit wide floating-point registers are
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required and double-precision operations use pairs of registers.
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</p>
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</dd>
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<dt><code>2 - Single-precision</code></dt>
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<dd><p>This variant indicates that single-precision support is used. Double
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precision operations will be supported via soft-float routines.
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</p>
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</dd>
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<dt><code>3 - Soft-float</code></dt>
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<dd><p>This variant indicates that although floating-point support is used all
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operations are emulated in software. This means the ABI is modified to
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pass all floating-point data in general-purpose registers.
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</p>
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</dd>
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<dt><code>4 - Deprecated</code></dt>
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<dd><p>This variant existed as an initial attempt at supporting 64-bit wide
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floating-point registers for O32 ABI on a MIPS32r2 CPU. This has been
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superseded by 5, 6 and 7.
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</p>
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</dd>
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<dt><code>5 - Double-precision 32-bit CPU, 32-bit or 64-bit FPU</code></dt>
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<dd><p>This variant is used by 32-bit ABIs to indicate that the floating-point
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code in the module has been designed to operate correctly with either
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32-bit wide or 64-bit wide floating-point registers. Double-precision
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support is used. Only O32 currently supports this variant and requires
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a minimum architecture of MIPS II.
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</p>
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</dd>
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<dt><code>6 - Double-precision 32-bit FPU, 64-bit FPU</code></dt>
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<dd><p>This variant is used by 32-bit ABIs to indicate that the floating-point
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code in the module requires 64-bit wide floating-point registers.
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Double-precision support is used. Only O32 currently supports this
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variant and requires a minimum architecture of MIPS32r2.
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</p>
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</dd>
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<dt><code>7 - Double-precision compat 32-bit FPU, 64-bit FPU</code></dt>
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<dd><p>This variant is used by 32-bit ABIs to indicate that the floating-point
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code in the module requires 64-bit wide floating-point registers.
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Double-precision support is used. This differs from the previous ABI
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as it restricts use of odd-numbered single-precision registers. Only
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O32 currently supports this variant and requires a minimum architecture
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of MIPS32r2.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="MIPS-FP-ABI-Selection.html#MIPS-FP-ABI-Selection" accesskey="n" rel="next">MIPS FP ABI Selection</a>, Previous: <a href="MIPS-FP-ABI-History.html#MIPS-FP-ABI-History" accesskey="p" rel="prev">MIPS FP ABI History</a>, Up: <a href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" accesskey="u" rel="up">MIPS FP ABIs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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