F5F Stay Refreshed Hardware Desktop Execution units in the Zen family design FP execution components

Execution units in the Zen family design FP execution components

Execution units in the Zen family design FP execution components

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Nitro_PT
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08-24-2019, 07:55 AM
#1
I saw another reference that brought me back to the FP execution units in Zen generations. The bottom row of the floating point block is worth noting here, as shown in Zen 3. Compared to Zen before Zen 2, there are two extra sections: one with F2I and ST, and a second block displaying only F2I. Zen 4 makes slight adjustments—its first block matches Zen 3, but the last block now uses ST instead of F2I. While exploring, I also discovered more details about these blocks in Zen 3, which seem to elaborate on each section. This isn't an AMD graphics chip.
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Nitro_PT
08-24-2019, 07:55 AM #1

I saw another reference that brought me back to the FP execution units in Zen generations. The bottom row of the floating point block is worth noting here, as shown in Zen 3. Compared to Zen before Zen 2, there are two extra sections: one with F2I and ST, and a second block displaying only F2I. Zen 4 makes slight adjustments—its first block matches Zen 3, but the last block now uses ST instead of F2I. While exploring, I also discovered more details about these blocks in Zen 3, which seem to elaborate on each section. This isn't an AMD graphics chip.

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ReyCr4ft
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08-25-2019, 12:28 AM
#2
FS seems to represent Floating point store. F2I looks like an FP-to-int conversion. Check the Zen 3 architecture page on wikichip for details on Architecture Key changes from Zen 2, Back-end → Floating point unit → second bullet point.
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ReyCr4ft
08-25-2019, 12:28 AM #2

FS seems to represent Floating point store. F2I looks like an FP-to-int conversion. Check the Zen 3 architecture page on wikichip for details on Architecture Key changes from Zen 2, Back-end → Floating point unit → second bullet point.

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