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Altera_Forum
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15 years ago

Do I need to set compile flag for Hardware Floating Point Custom Instruction Divider?

I added the hardware FPU into SOPC including divider. In the public.mk file the compile flag is: ALT_CFLAGS += -mcustom-fpu-cfg=60-1 ALT_LDFLAGS += -mcustom-fpu-cfg=60-1 So I have to set ...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Hmmm.... I wonder what is in the Altera defined FP custom instruction TCL that lets them assign instruction numbers that don't start from zero.

The standard stuff for adding custom instructions gives you no choice at all.

The actual decode logic generated ignores bits that aren't needed to select between the configured instructions.