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unittests/ASM: Test fpatan and fyl2x to clear tag

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Simon Scherer committed 2026-09-03 08:29:15 +02:00
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commit add92f681b
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unittests/ASM/FEX_bugs/fpatan_PopStackTag.asm
+33
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@@ -0,0 +1,33 @@
%ifdef CONFIG
{
"RegData": {
"RAX": "0x80"
}
}
%endif
; FEX had a bug in the slow path of x87 stack-optimization pass:
; popping the FPU stack never invalidated ST(0)
;
; Note this test only actually exercises the bug under the jit_1 run
; since otherwise the fast path is taken
fninit
fld1
fldl2e
fpatan
fxsave [rel .data]
; FTW
; Bit 6 (popped value) must be 0 now
; Bit 7 (result) must be 1
movzx eax, byte [rel .data + 4]
hlt
align 16
.data:
times 64 dq 0
unittests/ASM/FEX_bugs/fyl2x_PopStackTag.asm
+33
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@@ -0,0 +1,33 @@
%ifdef CONFIG
{
"RegData": {
"RAX": "0x80"
}
}
%endif
; FEX had a bug in the slow path of x87 stack-optimization pass:
; popping the FPU stack never invalidated ST(0)
;
; Note this test only actually exercises the bug under the jit_1 run
; since otherwise the fast path is taken
fninit
fld1
fld1
fyl2x
fxsave [rel .data]
; FTW
; Bit 6 (popped value) must be 0 now
; Bit 7 (result) must be 1
movzx eax, byte [rel .data + 4]
hlt
align 16
.data:
times 64 dq 0