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https://github.com/FEX-Emu/FEX.git
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Ryan Houdek
58b5620f97
x87 80-bit loads, both BCD and regular tword were loading 128-bits of data when reduced precision was enabled. This was an oversight from the previous fix a while ago. Adds a specific reduced precision test for this, and updates the current test to ensure stores are still tested as well.
38 lines
722 B
NASM
38 lines
722 B
NASM
%ifdef CONFIG
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{
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"MemoryRegions": {
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"0x100000000": "4096"
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},
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"Env": { "FEX_X87REDUCEDPRECISION" : "1" }
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}
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%endif
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; FEX-Emu had a bug where x87 loadstores at a page boundary with reduced precision enabled would loadstore 128-bits.
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finit ; enters x87 state
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mov rax, 0x100000000
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mov rbx, 0x4142434445464748
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mov rcx, 0x5152535455565758
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mov rdx, (0x100000000 + 0x1000 - 16)
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mov [rdx], rbx
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mov [rdx + 8], rcx
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mov rdx, 0x100000000 + 0x1000
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; Do an 80-bit load at the edge of a page.
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; Ensuring tword loads don't extend past the end of a page.
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fld tword [rdx - 10]
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; Do an 80-bit BCD load at the edge of a page.
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fbld [rdx - 10]
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; Do a BCD store
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fbstp [rdx - 10]
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; Regular 80-bit store
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fstp tword [rdx - 10]
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hlt
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