[EXT_EP-11070] Compiler intrinsic _itof ignores truncation of its argument Created: 21/Feb/23 Updated: 01/Apr/24 Resolved: 03/Aug/23 |
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| Status: | Fixed |
| Project: | Embedded Software & Tools |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Bug | Priority: | Medium |
| Reporter: | TI User | Assignee: | TI User |
| Resolution: | Fixed | Votes: | 0 |
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Product: | Code Generation Tools |
| Internal ID: | CODEGEN-10927 |
| Forum URL: | https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/81/t/1198153 |
| Found In Release: | C6000_8.3.12 |
| Fix In Release: | C6000_8.3.13 |
| Affected Platform/Device: | default |
| Description |
|
If the intrinsic _itof is passed an argument that is truncated to a size smaller than 32 bits, the compiler may incorrectly discard the truncation. This truncation can occur with a cast to short or a bit-mask to the lower 16 bits. For example: /*
build with
cl6x -mv6600 -O3 -s file.cpp
*/
#include <stdint.h>
float bug(uint32_t a, uint32_t b)
{
const uint32_t lo16 = b & 0x0000FFFFU;
return _itof(lo16);
}
You'll get bug:
RETNOP B3,4
MV .L1X B4,A4
The & 0x0000ffff is ignored. So, if the input value has bits set in the upper 16-bits, they are incorrectly part of the result returned from the function. |