skia /
skia /
37be7715fdd1463fd1a3158e8e8f537875c100c1 implement assert_true on ARM
This all comes together as
uminv tmp, condition
fmov gp, tmp
cbnz gp, all_true
brk 0
all_true:
...
The key idea is uminv(vec) will return 0 if any of the inputs are 0,
and non-zero if all of the inputs are non-zero, namely 0xffffffff.
fmov moves that minimum from a vector register to a general purpose
register where we can test it with cbnz, compare and branch if non-zero.
This jumps over the `brk 0` debug trap when all inputs are true.
Change-Id: If5deb77a77f52221d0649e537179743c45eb9cc5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254479
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed
