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Additional advice when setting up HWLoops. #932

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Jan 8, 2024
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Additional advice when setting up HWLoops. #932

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3 changes: 2 additions & 1 deletion docs/source/corev_hw_loop.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -103,10 +103,10 @@ Below an assembly code example of a nested HWLoop that computes a matrix additio
asm volatile (
"add %[i],x0, x0;"
"add %[j],x0, x0;"
"cv.count 1, %[N];"
".balign 4;"
"cv.endi 1, endO;"
"cv.starti 1, startO;"
"cv.count 1, %[N];"
"any instructions here"
".balign 4;"
"cv.endi 0, endZ;"
Expand All @@ -128,6 +128,7 @@ Below an assembly code example of a nested HWLoop that computes a matrix additio
: [N] "r" (10)
);

As HWLoop feature is enabled as soon as lpcountX > 0, it is a good practice to set lpstartX and lpendX **before** lpcountX to avoid unexpected behavior. For HWLoop where body contains up to 30 instructions, it is always better to use cv.setup* instructions which are updating all 3 HWLoop CSRs in the same cycle.

At the beginning of the HWLoop, the registers %[i] and %[j] are 0.
The innermost loop, from startZ to (endZ - 4), adds to %[i] three times 1 and
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