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| author | Mike Pall <mike> | 2012-10-07 15:47:11 +0200 |
|---|---|---|
| committer | Mike Pall <mike> | 2012-10-07 15:47:11 +0200 |
| commit | 0561a5693884d76db5b75f7cc746478b325b311b (patch) | |
| tree | beef0d8674adf5b0f24a101e4e92613ee85e996e /src/vm_x86.dasc | |
| parent | 0d62e2e1ab450a2d2d2291dc9da43606bd573bf7 (diff) | |
| download | luajit2-0561a5693884d76db5b75f7cc746478b325b311b.tar.gz | |
From Lua 5.2: Add math.log(x, base).
Diffstat (limited to 'src/vm_x86.dasc')
| -rw-r--r-- | src/vm_x86.dasc | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/src/vm_x86.dasc b/src/vm_x86.dasc index 67984c6c..75683225 100644 --- a/src/vm_x86.dasc +++ b/src/vm_x86.dasc @@ -2045,7 +2045,12 @@ static void build_subroutines(BuildCtx *ctx) |.else |.ffunc_n math_sqrt; fsqrt; jmp ->fff_resn |.endif - |.ffunc_n math_log, fldln2; fyl2x; jmp ->fff_resn + | + |.ffunc math_log + | cmp NARGS:RD, 1+1; jne ->fff_fallback // Exactly one argument. + | cmp dword [BASE+4], LJ_TISNUM; jae ->fff_fallback + | fldln2; fld qword [BASE]; fyl2x; jmp ->fff_resn + | |.ffunc_n math_log10, fldlg2; fyl2x; jmp ->fff_resn |.ffunc_n math_exp; call ->vm_exp_x87; jmp ->fff_resn | @@ -3157,6 +3162,29 @@ static void build_subroutines(BuildCtx *ctx) | ret |.endif | + |// FP log2(x). Called by math.log(x, base). + |->vm_log2: + |.if X64WIN + | movsd qword [rsp+8], xmm0 // Use scratch area. + | fld1 + | fld qword [rsp+8] + | fyl2x + | fstp qword [rsp+8] + | movsd xmm0, qword [rsp+8] + |.elif X64 + | movsd qword [rsp-8], xmm0 // Use red zone. + | fld1 + | fld qword [rsp-8] + | fyl2x + | fstp qword [rsp-8] + | movsd xmm0, qword [rsp-8] + |.else + | fld1 + | fld qword [esp+4] + | fyl2x + |.endif + | ret + | |// FP exponentiation e^x and 2^x. Called by math.exp fast function and |// from JIT code. Arg/ret on x87 stack. No int/xmm regs modified. |// Caveat: needs 3 slots on x87 stack! |