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Updated integer intrinsics documentation

Brabhsáil Foinse 
[ROCm/hip commit: 2c01480131]
Tá an tiomantas seo le fáil i:
Maneesh Gupta
2016-02-12 13:58:35 +05:30
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projects/hip/docs/markdown/hip_kernel_language.md
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@@ -363,27 +363,27 @@ Following is the list of supported double precision mathematical functions.
<sub><b id="f2"><sup>[1]</sup></b> __RETURN_TYPE is dependent on compiler. It is usually 'int' for C compilers and 'bool' for C++ compilers.</sub> [↩](#a2)
### Integer Intrinsics
Following is the list of supported integer intrinsics.
Following is the list of supported integer intrinsics. Note that intrinsics are supported on device only.
| **Function** | **Supported on Host** | **Supported on Device** |
| --- | --- | --- |
| unsigned int __brev ( unsigned int x ) <br><sub>Reverse the bit order of a 32 bit unsigned integer.</sub> | ✓ | ✓ |
| unsigned long long int __brevll ( unsigned long long int x ) <br><sub>Reverse the bit order of a 64 bit unsigned integer. </sub> | ✓ | ✓ |
| int __clz ( int x ) <br><sub>Return the number of consecutive high-order zero bits in a 32 bit integer.</sub> | ✓ | ✓ |
| unsigned int __clz(unsigned int x) <br><sub>Return the number of consecutive high-order zero bits in 32 bit unsigned integer.</sub> | ✓ | ✗ |
| int __clzll ( long long int x ) <br><sub>Count the number of consecutive high-order zero bits in a 64 bit integer.</sub> | ✓ | ✓ |
| unsigned int __clzll(long long int x) <br><sub>Return the number of consecutive high-order zero bits in 64 bit signed integer.</sub> | ✓ | ✗ |
| unsigned int __ffs(unsigned int x) <br><sub>Find the position of least signigicant bit set to 1 in a 32 bit unsigned integer.<sup id="a3">[1](#f3)</sup></sub> | ✓ | ✓|
| unsigned int __ffs(int x) <br><sub>Find the position of least signigicant bit set to 1 in a 32 bit signed integer.</sub> | ✗ | ✓ |
| unsigned int __ffsll(unsigned long long int x) <br><sub>Find the position of least signigicant bit set to 1 in a 64 bit unsigned integer.<sup>[1](#f3)</sup></sub> | ✓ | ✓ |
| unsigned int __ffsll(long long int x) <br><sub>Find the position of least signigicant bit set to 1 in a 64 bit signed integer.</sub> | ✗ | ✓ |
| unsigned int __popc ( unsigned int x ) <br><sub>Count the number of bits that are set to 1 in a 32 bit integer.</sub> | ✓ | ✓ |
| int __popcll ( unsigned long long int x )<br><sub>Count the number of bits that are set to 1 in a 64 bit integer.</sub> | ✓ | ✓ |
| **Function** |
| --- |
| unsigned int __brev ( unsigned int x ) <br><sub>Reverse the bit order of a 32 bit unsigned integer.</sub> |
| unsigned long long int __brevll ( unsigned long long int x ) <br><sub>Reverse the bit order of a 64 bit unsigned integer. </sub> |
| int __clz ( int x ) <br><sub>Return the number of consecutive high-order zero bits in a 32 bit integer.</sub> |
| unsigned int __clz(unsigned int x) <br><sub>Return the number of consecutive high-order zero bits in 32 bit unsigned integer.</sub> |
| int __clzll ( long long int x ) <br><sub>Count the number of consecutive high-order zero bits in a 64 bit integer.</sub> |
| unsigned int __clzll(long long int x) <br><sub>Return the number of consecutive high-order zero bits in 64 bit signed integer.</sub> |
| unsigned int __ffs(unsigned int x) <br><sub>Find the position of least signigicant bit set to 1 in a 32 bit unsigned integer.<sup id="a3">[1](#f3)</sup></sub> |
| unsigned int __ffs(int x) <br><sub>Find the position of least signigicant bit set to 1 in a 32 bit signed integer.</sub> |
| unsigned int __ffsll(unsigned long long int x) <br><sub>Find the position of least signigicant bit set to 1 in a 64 bit unsigned integer.<sup>[1](#f3)</sup></sub> |
| unsigned int __ffsll(long long int x) <br><sub>Find the position of least signigicant bit set to 1 in a 64 bit signed integer.</sub> |
| unsigned int __popc ( unsigned int x ) <br><sub>Count the number of bits that are set to 1 in a 32 bit integer.</sub> |
| int __popcll ( unsigned long long int x )<br><sub>Count the number of bits that are set to 1 in a 64 bit integer.</sub> |
<sub><b id="f3"><sup>[1]</sup></b>
The hcc implementation of __ffs() and __ffsll() contains code to add a constant +1 to produce the ffs result format.
For the cases where this overhead is not acceptable and programmer is willing to specialize for the platform,
hcc provides hc::__lastbit_u32_u32(unsigned int input) and hc::__lastbit_u32_u64(unsigned long long int input).
The index returned by __lastbit_ instructions starts at 0, while for ffs the index starts at 1.
The index returned by __lastbit_ instructions starts at -1, while for ffs the index starts at 0.
## Texture Functions