https://bugs.llvm.org/show_bug.cgi?id=52230
Bug ID: 52230
Summary: Assertion failure when inline assembly referencing
floating point registers is used on soft-float targets
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
Assignee: unassignedb...@nondot.org
Reporter: kosov.pa...@huawei.com
CC: llvm-bugs@lists.llvm.org, smithp...@googlemail.com,
ties.st...@arm.com
We have a problem which triggers assertion failure (or UB) when inline assembly
referencing floating point registers is used on soft-float targets
(arm-linux-gnueabi, arm-linux-android). Asserion is triggered in backend which
tries to lower FP register access without FP registers available (target
feature “-fpregs” is passed to backend by clang).
Steps to reproduce:
Given code sample `f.c`
```
float f(float x) { __asm__("vsqrt.f32 %0, %1": "=w"(x) : "t"(x)); return x; }
```
Compile it to arm-linux-gnueabi target with
`clang -target arm-linux-gnueabi -c f.c`
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