[LLVMbugs] [Bug 24100] New: Clang assumes that Cortex-M4 has an FPU by default

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24100

            Bug ID: 24100
           Summary: Clang assumes that Cortex-M4 has an FPU by default
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ambrop7 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14579
  --> https://llvm.org/bugs/attachment.cgi?id=14579&action=edit
Test case, function that multiplies floats

When one compiles for arm-none-eabi with "-mcpu=cortex-m4", the generated code
will use floating point instructions. This is different from GCC (the
gcc-arm-embedded builds), which will use software floating point unless an FPU
is specified (e.g. -mfpu=fpv4-sp-d16 -mfloat-abi=hard). Note that are many
Cortex-M4 parts without an FPU.

Attached is a test case that can be compiled to assembly with:
arm-none-eabi-clang -mcpu=cortex-m4 -mthumb -S float.c -o -

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