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<title>Using the GNU Compiler Collection (GCC): Nvidia PTX Options</title>
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<a name="Nvidia-PTX-Options"></a>
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<div class="header">
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<p>
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Next: <a href="PDP_002d11-Options.html#PDP_002d11-Options" accesskey="n" rel="next">PDP-11 Options</a>, Previous: <a href="Nios-II-Options.html#Nios-II-Options" accesskey="p" rel="prev">Nios II Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Nvidia-PTX-Options-1"></a>
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<h4 class="subsection">3.18.33 Nvidia PTX Options</h4>
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<a name="index-Nvidia-PTX-options"></a>
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<a name="index-nvptx-options"></a>
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<p>These options are defined for Nvidia PTX:
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</p>
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<dl compact="compact">
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<dt><code>-m32</code></dt>
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<dt><code>-m64</code></dt>
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<dd><a name="index-m32"></a>
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<a name="index-m64"></a>
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<p>Generate code for 32-bit or 64-bit ABI.
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</p>
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</dd>
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<dt><code>-mmainkernel</code></dt>
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<dd><a name="index-mmainkernel"></a>
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<p>Link in code for a __main kernel. This is for stand-alone instead of
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offloading execution.
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</p>
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</dd>
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<dt><code>-moptimize</code></dt>
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<dd><a name="index-moptimize"></a>
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<p>Apply partitioned execution optimizations. This is the default when any
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level of optimization is selected.
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</p>
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</dd>
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<dt><code>-msoft-stack</code></dt>
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<dd><a name="index-msoft_002dstack"></a>
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<p>Generate code that does not use <code>.local</code> memory
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directly for stack storage. Instead, a per-warp stack pointer is
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maintained explicitly. This enables variable-length stack allocation (with
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variable-length arrays or <code>alloca</code>), and when global memory is used for
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underlying storage, makes it possible to access automatic variables from other
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threads, or with atomic instructions. This code generation variant is used
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for OpenMP offloading, but the option is exposed on its own for the purpose
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of testing the compiler; to generate code suitable for linking into programs
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using OpenMP offloading, use option <samp>-mgomp</samp>.
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</p>
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</dd>
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<dt><code>-muniform-simt</code></dt>
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<dd><a name="index-muniform_002dsimt"></a>
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<p>Switch to code generation variant that allows to execute all threads in each
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warp, while maintaining memory state and side effects as if only one thread
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in each warp was active outside of OpenMP SIMD regions. All atomic operations
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and calls to runtime (malloc, free, vprintf) are conditionally executed (iff
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current lane index equals the master lane index), and the register being
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assigned is copied via a shuffle instruction from the master lane. Outside of
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SIMD regions lane 0 is the master; inside, each thread sees itself as the
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master. Shared memory array <code>int __nvptx_uni[]</code> stores all-zeros or
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all-ones bitmasks for each warp, indicating current mode (0 outside of SIMD
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regions). Each thread can bitwise-and the bitmask at position <code>tid.y</code>
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with current lane index to compute the master lane index.
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</p>
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</dd>
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<dt><code>-mgomp</code></dt>
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<dd><a name="index-mgomp"></a>
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<p>Generate code for use in OpenMP offloading: enables <samp>-msoft-stack</samp> and
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<samp>-muniform-simt</samp> options, and selects corresponding multilib variant.
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</p>
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</dd>
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</dl>
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Next: <a href="PDP_002d11-Options.html#PDP_002d11-Options" accesskey="n" rel="next">PDP-11 Options</a>, Previous: <a href="Nios-II-Options.html#Nios-II-Options" accesskey="p" rel="prev">Nios II Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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