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| <h4 class="subsection">9.43.3 Floating Point</h4> |
| |
| <p><a name="index-floating-point_002c-SH-_0028_0040sc_007bieee_007d_0029-2127"></a><a name="index-SH-floating-point-_0028_0040sc_007bieee_007d_0029-2128"></a>SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other |
| SH groups can use <code>.float</code> directive to generate <span class="sc">ieee</span> |
| floating-point numbers. |
| |
| <p>SH2E and SH3E support single-precision floating point calculations as |
| well as entirely PCAPI compatible emulation of double-precision |
| floating point calculations. SH2E and SH3E instructions are a subset of |
| the floating point calculations conforming to the IEEE754 standard. |
| |
| <p>In addition to single-precision and double-precision floating-point |
| operation capability, the on-chip FPU of SH4 has a 128-bit graphic |
| engine that enables 32-bit floating-point data to be processed 128 |
| bits at a time. It also supports 4 * 4 array operations and inner |
| product operations. Also, a superscalar architecture is employed that |
| enables simultaneous execution of two instructions (including FPU |
| instructions), providing performance of up to twice that of |
| conventional architectures at the same frequency. |
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