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unittests: add XeSS test

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Useful smoke test for the asymptoptic behaviour of our constant pooling code.
Not useful for correctness testing, so skip in CI.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig 2024-05-19 11:40:25 -04:00
parent ca70e387ec
commit dfb751eea0
2 changed files with 24 additions and 0 deletions
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3
unittests/ASM/Disabled_Tests
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@ -22,3 +22,6 @@ Test_X87/D9_F2.asm
# Relies on rounding correctness
Test_X87/D9_F8.asm
# This is basically a benchmark.
FEX_bugs/XeSS_quadratic.asm

21
unittests/ASM/FEX_bugs/XeSS_quadratic.asm Normal file
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@ -0,0 +1,21 @@
%ifdef CONFIG
{
"MemoryRegions": {
"0x200000000": "0x20000"
}
}
%endif
; FEX has had various bugs throughout the years leading to accidental
; superlinear time, for example with constant pooling and register allocation.
; This test mimics the massive block found in XeSS. If this test has
; excessive runtime, something in broken in FEXCore.
mov rsp, 0x200000000
%assign i 0
%rep 0x10000
mov byte [rsp + (0x10000 + i)], (0x01 + (i << 2)) & 0xFF
%assign i i+1
%endrep
hlt