Arm Development Studio forum ARM SMMULR instruction

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ARM SMMULR instruction

VishalPatil VishalPatil over 12 years ago

VishalPatil VishalPatil over 12 years ago

Note: This was originally posted on 15th July 2009 at http://forums.arm.com

Hi,

Thanks for your reply.

Resolution: SMULL RTemp, Rd, Rm, Rs
                          ADDS RTemp, RTemp, #0X80000000
                          ADDCS Rd, Rd, #0X00000001

Because of          ADDS RTemp, RTemp, #0X80000000
                          ADDCS Rd, Rd, #0X00000001

Output in Rd differ by 1.
This is some thing wrong while we are try to rounded.
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Peter Harris over 12 years ago

Note: This was originally posted on 15th July 2009 at http://forums.arm.com

What input values are causing the error?

What are you running the code on?
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Peter Harris over 12 years ago

Note: This was originally posted on 15th July 2009 at http://forums.arm.com

Sure - I understand your code - I'm just trying to reproduce the error you are seeing =)

What values of Rm and Rs cause the fault you are seeing?

What processor are you running on?
Are you running on hardware or a model?
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