| Issue |
137764
|
| Summary |
32-bit registers store variables of unsigned char type without zero extension
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
zhaojiangkun-1
|
I found that the 32-bit register stores unsigned char type variables without zero extension in x86.
However, in arm and gcc x86, there are zero extension instructions.
In gcc x86, `movzx edi and dil `are used.
In ARM, `and x8, x0, #0xff` are used to implement this function.
Why does x86 not have zero extension instructions? Is this a bug?
https://godbolt.org/z/4PWhnz7a5
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