[llvm-commits] Fix PR13936: Add sdiv/udiv in ARM mode for targets that support them

[Weiming Zhao]

Hi,

 

This patch fixes PR 13936 (http://llvm.org/bugs/show_bug.cgi?id=13936)

 

According to ARM manual [1], ARM mode sdiv/udiv are optional in ARMv7-A and
ARMv7-R on ARM mode. 

So, this patch adds the ARM mode sdiv/udiv definition and encoding  into

existing td files and use the existing target-feature: hwdiv flag to guard
it. 

So, we can avoid calls to RT lib if the hardware supports hw div.

 

Please review the attached patch. 

 

Thanks,

Weiming

 

[1] Architecture Reference Manual ARMv7-A and ARMv7-R edition,

https://silver.arm.com/download/ARM_and_AMBA_Architecture/AR570-DA-70000-r0p
0-00rel1/DDI0406C_b_arm_architecture_reference_manual.pdf

, Page A8-600

 

 

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