| Issue |
119963
|
| Summary |
Clang doesn't accept udiv with 2 operands when assembling for Cortex-M3
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
mateusz-banaszek
|
When using clang to assemble for ARM Cortex-M3, it doesn't accept an `udiv` instruction with 2 operands, for example:
```asm
.syntax unified
udiv r10, r5
```
An attempt to assemble that using clang v19.1.5:
```
clang -nodefaultlibs -mcpu=cortex-m3 --target=armv7m-none-eabi ./example.s
```
results in an error:
```
./example.s:3:15: error: too few operands for instruction
udiv r10, r5
^
```
However, *Arm v7-M Architecture Reference Manual* says that the assembler syntax is `UDIV<c><q> {<Rd>,} <Rn>, <Rm>` where *"`<Rd>` Specifies the destination register. If `<Rd>` is omitted, this register is the same as `<Rn>`."* As a result, I expect clang to assemble that into:
```
fbba faf5 udiv r10, r10, r5
```
GCC assembles it correctly: https://godbolt.org/z/oh8TnW99T.
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