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Add more libm unit tests and fixes

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See #61
This commit is contained in:
Justine Tunney 2021-03-02 13:57:23 -08:00
parent 32e289b1d8
commit 9367253b4d
15 changed files with 390 additions and 124 deletions
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27
libc/tinymath/truncf.S
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@ -17,18 +17,28 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
.source __FILE__
// Rounds to integer, toward zero.
//
// @param 𝑥 is float scalar in low quarter of %xmm0
// @return float scalar in low quarter of %xmm0
// @define trunc(𝑥+copysign(.5,𝑥))
// @see round(),rint(),nearbyint()
// @see roundss $_MM_FROUND_TO_ZERO|_MM_FROUND_NO_EXC,%xmm0,%xmm0
truncf: .leafprologue
.profilable
movss 3f(%rip),%xmm1
andps %xmm0,%xmm1
movss 2f(%rip),%xmm2
comiss %xmm1,%xmm2
movss 3f(%rip),%xmm2
movss 2f(%rip),%xmm4
movaps %xmm0,%xmm3
movaps %xmm0,%xmm1
andps %xmm2,%xmm3
ucomiss %xmm3,%xmm4
jbe 1f
cvttss2si %xmm0,%eax
cvttss2sil %xmm0,%eax
pxor %xmm0,%xmm0
cvtsi2ss %eax,%xmm0
andnps %xmm1,%xmm2
cvtsi2ssl %eax,%xmm0
orps %xmm2,%xmm0
1: .leafepilogue
.endfn truncf,globl
@ -36,6 +46,3 @@ truncf: .leafprologue
2: .long 0x4b000000
.rodata.cst16
3: .long 0x7fffffff,0,0,0
// TODO(jart)
// roundss $_MM_FROUND_TO_ZERO|_MM_FROUND_NO_EXC,%xmm0,%xmm0