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Implement SaddSat and SsubSat for the interpreter

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Implemented `SaddSat` and `SsubSat` to add and subtract signed vector
values, saturating at the type boundaries rather than overflowing.

Changed the parser to allow signed `i8` immediates in vectors as part of
this work; fixes #3276.

Copyright (c) 2021, Arm Limited.
This commit is contained in:
dheaton-arm
2021-09-03 11:35:39 +01:00
parent dd71acd7e3
commit 8f057e0482
7 changed files with 93 additions and 3 deletions
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19
cranelift/filetests/filetests/runtests/simd-ssubsat.clif Normal file
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test interpret
test run
target aarch64
set enable_simd
target x86_64
function %ssubsat_i8x16(i8x16, i8x16) -> i8x16 {
block0(v0: i8x16, v1: i8x16):
v2 = ssub_sat v0, v1
return v2
}
; run: %ssubsat_i8x16([1 100 100 100 100 100 100 100 -100 -100 -100 -100 -100 -100 -100 -100], [1 -100 -100 -100 -100 -100 -100 -100 100 100 100 100 100 100 100 100]) == [0 127 127 127 127 127 127 127 -128 -128 -128 -128 -128 -128 -128 -128]
function %ssubsat_i16x8(i16x8, i16x8) -> i16x8 {
block0(v0: i16x8, v1: i16x8):
v2 = ssub_sat v0, v1
return v2
}
; run: %ssubsat_i16x8([1 -32000 -32000 -32000 32000 32000 32000 32000], [1 1000 1000 1000 -1000 -1000 -1000 -1000]) == [0 -32768 -32768 -32768 32767 32767 32767 32767]