skia2/tests/sksl/runtime/LoopFloat.skvm
John Stiles 733fd74c29 Improve unit testing of for-loops.
An ES2-compatible for loop supports six separate rel-ops:
   < <= > >= != ==
Each rel-op, in addition to its expected usage, is also able to
represent a loop which never terminates, as well as a loop which
terminates instantly. Since SkVM unrolls these loops, we should make
sure we do it properly. We now have unit tests for all of these cases.

Change-Id: Icae04d48bc158bf8c0c98db97f76756a1a29110c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/445756
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
2021-09-07 14:11:04 +00:00

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4 registers, 8 instructions:
0 r0 = uniform32 ptr0 14
1 r1 = uniform32 ptr0 18
2 r2 = uniform32 ptr0 1C
3 r3 = uniform32 ptr0 20
loop:
4 store32 ptr1 r0
5 store32 ptr2 r1
6 store32 ptr3 r2
7 store32 ptr4 r3