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Perform some code cleanup

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This commit is contained in:
Justine Tunney
2021-02-27 10:33:32 -08:00
parent 3e17c7b20f
commit 19d0c15e03
41 changed files with 321 additions and 459 deletions
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5
libc/calls/calls.mk
View File

@@ -68,7 +68,10 @@ o/$(MODE)/libc/calls/siggy.o: \
OVERRIDE_COPTS += \
-ffunction-sections
o/$(MODE)/libc/calls/xnutrampoline.o \
o/$(MODE)/libc/calls/sigenter-freebsd.o \
o/$(MODE)/libc/calls/sigenter-netbsd.o \
o/$(MODE)/libc/calls/sigenter-openbsd.o \
o/$(MODE)/libc/calls/sigenter-xnu.o \
o/$(MODE)/libc/calls/ntcontext2linux.o: \
OVERRIDE_COPTS += \
-O3

42
libc/calls/sigenter-freebsd.c
View File

@@ -43,21 +43,21 @@ struct siginfo_freebsd {
union sigval_freebsd si_value;
union {
struct {
int _trapno;
int32_t _trapno;
} _fault;
struct {
int _timerid;
int _overrun;
int32_t _timerid;
int32_t _overrun;
} _timer;
struct {
int _mqd;
int32_t _mqd;
} _mesgq;
struct {
long _band;
int64_t _band;
} _poll;
struct {
long __spare1__;
int __spare2__[7];
int64_t __spare1__;
int32_t __spare2__[7];
} __spare__;
} _reason;
};
@@ -106,7 +106,7 @@ struct mcontext_freebsd {
int64_t mc_gsbase;
int64_t mc_xfpustate;
int64_t mc_xfpustate_len;
long mc_spare[4];
int64_t mc_spare[4];
};
struct ucontext_freebsd {
@@ -118,8 +118,8 @@ struct ucontext_freebsd {
int32_t __spare__[4];
};
hidden void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
struct ucontext_freebsd *ctx) {
void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
struct ucontext_freebsd *ctx) {
int rva;
ucontext_t uc;
rva = __sighandrvas[sig & (NSIG - 1)];
@@ -133,28 +133,28 @@ hidden void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
uc.uc_flags = ctx->uc_flags;
memcpy(&uc.uc_sigmask, &ctx->uc_sigmask,
MIN(sizeof(uc.uc_sigmask), sizeof(ctx->uc_sigmask)));
uc.uc_mcontext.rdi = ctx->uc_mcontext.mc_rdi;
uc.uc_mcontext.rsi = ctx->uc_mcontext.mc_rsi;
uc.uc_mcontext.rdx = ctx->uc_mcontext.mc_rdx;
uc.uc_mcontext.rcx = ctx->uc_mcontext.mc_rcx;
uc.uc_mcontext.r8 = ctx->uc_mcontext.mc_r8;
uc.uc_mcontext.r9 = ctx->uc_mcontext.mc_r9;
uc.uc_mcontext.rax = ctx->uc_mcontext.mc_rax;
uc.uc_mcontext.rbx = ctx->uc_mcontext.mc_rbx;
uc.uc_mcontext.rbp = ctx->uc_mcontext.mc_rbp;
uc.uc_mcontext.r10 = ctx->uc_mcontext.mc_r10;
uc.uc_mcontext.r11 = ctx->uc_mcontext.mc_r11;
uc.uc_mcontext.r12 = ctx->uc_mcontext.mc_r12;
uc.uc_mcontext.r13 = ctx->uc_mcontext.mc_r13;
uc.uc_mcontext.r14 = ctx->uc_mcontext.mc_r14;
uc.uc_mcontext.r15 = ctx->uc_mcontext.mc_r15;
uc.uc_mcontext.trapno = ctx->uc_mcontext.mc_trapno;
uc.uc_mcontext.rdi = ctx->uc_mcontext.mc_rdi;
uc.uc_mcontext.rsi = ctx->uc_mcontext.mc_rsi;
uc.uc_mcontext.rbp = ctx->uc_mcontext.mc_rbp;
uc.uc_mcontext.rbx = ctx->uc_mcontext.mc_rbx;
uc.uc_mcontext.rdx = ctx->uc_mcontext.mc_rdx;
uc.uc_mcontext.rax = ctx->uc_mcontext.mc_rax;
uc.uc_mcontext.rcx = ctx->uc_mcontext.mc_rcx;
uc.uc_mcontext.rsp = ctx->uc_mcontext.mc_rsp;
uc.uc_mcontext.rip = ctx->uc_mcontext.mc_rip;
uc.uc_mcontext.eflags = ctx->uc_mcontext.mc_flags;
uc.uc_mcontext.fs = ctx->uc_mcontext.mc_fs;
uc.uc_mcontext.gs = ctx->uc_mcontext.mc_gs;
uc.uc_mcontext.eflags = ctx->uc_mcontext.mc_flags;
uc.uc_mcontext.err = ctx->uc_mcontext.mc_err;
uc.uc_mcontext.rip = ctx->uc_mcontext.mc_rip;
uc.uc_mcontext.rsp = ctx->uc_mcontext.mc_rsp;
uc.uc_mcontext.trapno = ctx->uc_mcontext.mc_trapno;
}
((sigaction_f)(_base + rva))(sig, (void *)si, &uc);
if (ctx) {

4
libc/calls/sigenter-netbsd.c
View File

@@ -125,8 +125,8 @@ struct ucontext_netbsd {
struct mcontext_netbsd uc_mcontext;
};
hidden void __sigenter_netbsd(int sig, struct siginfo_netbsd *si,
struct ucontext_netbsd *ctx) {
void __sigenter_netbsd(int sig, struct siginfo_netbsd *si,
struct ucontext_netbsd *ctx) {
int rva;
ucontext_t uc;
struct siginfo si2;

4
libc/calls/sigenter-openbsd.c
View File

@@ -90,8 +90,8 @@ struct ucontext_openbsd {
int64_t sc_cookie;
};
hidden void __sigenter_openbsd(int sig, struct siginfo_openbsd *si,
struct ucontext_openbsd *ctx) {
void __sigenter_openbsd(int sig, struct siginfo_openbsd *si,
struct ucontext_openbsd *ctx) {
int rva;
ucontext_t uc;
struct siginfo si2;

0
libc/calls/xnutrampoline.c → libc/calls/sigenter-xnu.c
View File

12
libc/log/commandvenv.c
View File

@@ -30,12 +30,12 @@
* that spawn subprocesses can use this function to determine the path
* at startup. Here's an example how you could use it:
*
* if ((strace = commandvenv("STRACE", "strace"))) {
* strace = strdup(strace);
* } else {
* fprintf(stderr, "error: please install strace\n");
* exit(1);
* }
* if ((strace = commandvenv("STRACE", "strace"))) {
* strace = strdup(strace);
* } else {
* fprintf(stderr, "error: please install strace\n");
* exit(1);
* }
*
* @param var is environment variable which may be used to override
* PATH search, and it can force a NULL result if it's empty

1
libc/runtime/efimain.greg.c
View File

@@ -63,7 +63,6 @@ static const EFI_GUID kEfiLoadedImageProtocol = LOADED_IMAGE_PROTOCOL;
*/
__msabi noasan EFI_STATUS EfiMain(EFI_HANDLE ImageHandle,
EFI_SYSTEM_TABLE *SystemTable) {
bool ispml5t;
int type, x87cw;
struct mman *mm;
uint32_t DescVersion;

4
libc/runtime/exit3.c
View File

@@ -23,6 +23,8 @@
#include "libc/nt/thunk/msabi.h"
#include "libc/sysv/consts/nr.h"
extern void(__msabi* __imp_ExitProcess)(uint32_t);
/**
* Terminates process, ignoring destructors and atexit() handlers.
*
@@ -41,10 +43,10 @@ privileged wontreturn void _Exit(int exitcode) {
: "a"(__NR_exit_group), "D"(exitcode)
: "memory");
} else if (IsWindows()) {
extern void(__msabi * __imp_ExitProcess)(uint32_t);
__imp_ExitProcess(exitcode & 0xff);
}
asm("push\t$0\n\t"
"push\t$0\n\t"
"cli\n\t"
"lidt\t(%rsp)");
for (;;) asm("ud2");

19
libc/runtime/runtime.mk
View File

@@ -57,21 +57,22 @@ $(LIBC_RUNTIME_A).pkg: \
$(foreach x,$(LIBC_RUNTIME_A_DIRECTDEPS),$($(x)_A).pkg)
o/$(MODE)/libc/runtime/abort-nt.o \
o/$(MODE)/libc/runtime/assertfail.o \
o/$(MODE)/libc/runtime/memtrack.o \
o/$(MODE)/libc/runtime/memtracknt.o \
o/$(MODE)/libc/runtime/findmemoryinterval.o \
o/$(MODE)/libc/runtime/arememoryintervalsok.o \
o/$(MODE)/libc/runtime/isheap.o \
o/$(MODE)/libc/runtime/assertfail.o \
o/$(MODE)/libc/runtime/directmap.o \
o/$(MODE)/libc/runtime/directmapnt.o \
o/$(MODE)/libc/runtime/stackchkfail.o \
o/$(MODE)/libc/runtime/stackchkfaillocal.o \
o/$(MODE)/libc/runtime/hook.greg.o \
o/$(MODE)/libc/runtime/print.greg.o \
o/$(MODE)/libc/runtime/findmemoryinterval.o \
o/$(MODE)/libc/runtime/ftrace.greg.o \
o/$(MODE)/libc/runtime/getdosargv.o \
o/$(MODE)/libc/runtime/getdosenviron.o \
o/$(MODE)/libc/runtime/hook.greg.o \
o/$(MODE)/libc/runtime/isheap.o \
o/$(MODE)/libc/runtime/memtrack.o \
o/$(MODE)/libc/runtime/memtracknt.o \
o/$(MODE)/libc/runtime/mman.greg.o \
o/$(MODE)/libc/runtime/print.greg.o \
o/$(MODE)/libc/runtime/stackchkfail.o \
o/$(MODE)/libc/runtime/stackchkfaillocal.o \
o/$(MODE)/libc/runtime/winmain.greg.o: \
OVERRIDE_CFLAGS += \
$(NO_MAGIC)

10
libc/runtime/winmain.greg.c
View File

@@ -61,10 +61,6 @@ struct WinArgs {
char envblock[ARG_MAX];
};
static noasan textwindows void SetTrueColor(void) {
SetEnvironmentVariable(u"TERM", u"xterm-truecolor");
}
static noasan textwindows void MakeLongDoubleLongAgain(void) {
/* 8087 FPU Control Word
IM: Invalid Operation ───────────────┐
@@ -92,7 +88,6 @@ static noasan textwindows void NormalizeCmdExe(int version) {
hstdout = GetStdHandle(pushpop(kNtStdOutputHandle));
hstderr = GetStdHandle(pushpop(kNtStdErrorHandle));
if (GetFileType((handle = hstdin)) == kNtFileTypeChar) {
/* SetTrueColor(); */
SetConsoleCP(kNtCpUtf8);
GetConsoleMode(handle, &mode);
SetConsoleMode(handle, mode | kNtEnableProcessedInput |
@@ -102,7 +97,6 @@ static noasan textwindows void NormalizeCmdExe(int version) {
}
if (GetFileType((handle = hstdout)) == kNtFileTypeChar ||
GetFileType((handle = hstderr)) == kNtFileTypeChar) {
/* SetTrueColor(); */
SetConsoleOutputCP(kNtCpUtf8);
GetConsoleMode(handle, &mode);
SetConsoleMode(
@@ -135,7 +129,7 @@ static noasan textwindows wontreturn void WinMainNew(void) {
_mmi.p[0].y = (addr >> 16) + ((size >> 16) - 1);
_mmi.p[0].prot = PROT_READ | PROT_WRITE | PROT_EXEC;
_mmi.p[0].flags = MAP_PRIVATE | MAP_ANONYMOUS;
_mmi.i = pushpop(1L);
_mmi.i = 1;
wa = (struct WinArgs *)(addr + size - sizeof(struct WinArgs));
count = GetDosArgv(GetCommandLine(), wa->argblock, ARRAYLEN(wa->argblock),
wa->argv, ARRAYLEN(wa->argv));
@@ -193,7 +187,7 @@ static noasan textwindows wontreturn void WinMainNew(void) {
noasan textwindows int64_t WinMain(int64_t hInstance, int64_t hPrevInstance,
const char *lpCmdLine, int nCmdShow) {
MakeLongDoubleLongAgain();
if (weaken(__winsockinit)) weaken(__winsockinit)();
if (weaken(WinSockInit)) weaken(WinSockInit)();
if (weaken(WinMainForked)) weaken(WinMainForked)();
WinMainNew();
}

2
libc/sock/internal.h
View File

@@ -114,7 +114,7 @@ ssize_t sys_sendto_nt(struct Fd *, const struct iovec *, size_t, uint32_t,
ssize_t sys_recvfrom_nt(struct Fd *, const struct iovec *, size_t, uint32_t,
void *, uint32_t *) hidden;
void __winsockinit(void) hidden;
void WinSockInit(void) hidden;
int64_t __winsockerr(void) nocallback hidden;
int __fixupnewsockfd(int, int) hidden;
int64_t __winsockblock(int64_t, unsigned, int64_t) hidden;

6
libc/sock/kntwsadata.c
View File

@@ -33,13 +33,13 @@
*/
hidden struct NtWsaData kNtWsaData;
static textwindows void __winsockfini(void) {
static textwindows void WinSockCleanup(void) {
WSACleanup();
}
textwindows noasan void __winsockinit(void) {
textwindows noasan void WinSockInit(void) {
int rc;
atexit(__winsockfini);
atexit(WinSockCleanup);
if ((rc = WSAStartup(VERSION, &kNtWsaData)) != 0 ||
kNtWsaData.wVersion != VERSION) {
ExitProcess(123);

2
libc/str/endswith.c
View File

@@ -29,5 +29,5 @@ bool endswith(const char *s, const char *suffix) {
n = strlen(s);
m = strlen(suffix);
if (m > n) return false;
return memcmp(s + n - m, suffix, m) == 0;
return !memcmp(s + n - m, suffix, m);
}

6
libc/str/str.h
View File

@@ -179,17 +179,13 @@ compatfn wchar_t *wmemcpy(wchar_t *, const wchar_t *, size_t) memcpyesque;
compatfn wchar_t *wmempcpy(wchar_t *, const wchar_t *, size_t) memcpyesque;
compatfn wchar_t *wmemmove(wchar_t *, const wchar_t *, size_t) memcpyesque;
int timingsafe_memcmp(const void *, const void *, size_t);
void *tinymemccpy(void *, const void *, int, size_t) memcpyesque;
void *memmem(const void *, size_t, const void *, size_t)
paramsnonnull() nothrow nocallback nosideeffect;
char *strerror(int) returnsnonnull nothrow nocallback;
long a64l(const char *);
char *l64a(long);
char *tinystrstr(const char *, const char *) strlenesque;
char16_t *tinystrstr16(const char16_t *, const char16_t *) strlenesque;
void *tinymemmem(const void *, size_t, const void *, size_t) strlenesque;
void *tinymemccpy(void *, const void *, int, size_t) memcpyesque;
char *strntolower(char *, size_t);
char *strtolower(char *) paramsnonnull();
char *strntoupper(char *, size_t);

8
libc/str/strsep.c
View File

@@ -34,10 +34,12 @@
* @note unlike strtok() this does empty tokens and is re-entrant
*/
char *strsep(char **str, const char *delim) {
char *token = *str;
size_t i;
char *token, *next;
token = *str;
if (token) {
size_t i = strcspn(token, delim);
char *next = NULL;
i = strcspn(token, delim);
next = NULL;
if (token[i]) {
token[i] = '\0';
next = &token[i + 1];

2
libc/str/strsignal.c
View File

@@ -37,7 +37,7 @@ static char g_strsignal[4 + 8];
* @see sigaction()
*/
char *strsignal(int sig) {
if (0 <= sig && (unsigned)sig < ARRAYLEN(kStrSignals)) {
if (0 <= sig && sig < ARRAYLEN(kStrSignals)) {
memcpy(g_strsignal, kSig, 4);
memcpy(&g_strsignal[3], kStrSignals[sig], 8);
} else {

13
libc/str/strstr16.c
View File

@@ -28,6 +28,15 @@
* @see memmem()
*/
char16_t *strstr16(const char16_t *haystack, const char16_t *needle) {
return memmem(haystack, strlen16(haystack) * sizeof(char16_t), needle,
strlen16(needle) * sizeof(char16_t));
size_t i;
for (;;) {
for (i = 0;;) {
if (!needle[i]) return (/*unconst*/ char16_t *)haystack;
if (!haystack[i]) break;
if (needle[i] != haystack[i]) break;
++i;
}
if (!*haystack++) break;
}
return NULL;
}

37
libc/str/tinymemmem.c
View File

@@ -1,37 +0,0 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/str/str.h"
/**
* Naïve substring search implementation.
* @see libc/alg/memmem.c
*/
void *tinymemmem(const void *haystack, size_t haystacksize, const void *needle,
size_t needlesize) {
size_t i;
const char *p, *pe;
for (p = haystack, pe = p + haystacksize; p < pe;) {
for (++p, i = 0;;) {
if (++i > needlesize) return p - 1;
if (p == pe) break;
if (((const char *)needle)[i - 1] != (p - 1)[i - 1]) break;
}
}
return !haystacksize && !needlesize ? haystack : NULL;
}

38
libc/str/tinystrstr.c
View File

@@ -1,38 +0,0 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/str/internal.h"
/**
* Naïve substring search implementation.
* @see libc/str/strstr.c
* @asyncsignalsafe
*/
char *tinystrstr(const char *haystack, const char *needle) {
size_t i;
for (;;) {
for (i = 0;;) {
if (!needle[i]) return (/*unconst*/ char *)haystack;
if (!haystack[i]) break;
if (needle[i] != haystack[i]) break;
++i;
}
if (!*haystack++) break;
}
return NULL;
}

38
libc/str/tinystrstr16.c
View File

@@ -1,38 +0,0 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/str/internal.h"
/**
* Naïve substring search implementation.
* @see libc/str/strstr.c
* @asyncsignalsafe
*/
char16_t *tinystrstr16(const char16_t *haystack, const char16_t *needle) {
size_t i;
for (;;) {
for (i = 0;;) {
if (!needle[i]) return (/*unconst*/ char16_t *)haystack;
if (!haystack[i]) break;
if (needle[i] != haystack[i]) break;
++i;
}
if (!*haystack++) break;
}
return NULL;
}

1
libc/tinymath/hypot.c
View File

@@ -24,7 +24,6 @@
double hypot(double a, double b) {
double r, t;
if (isinf(a) || isinf(b)) return INFINITY;
if (isunordered(a, b)) return NAN;
a = fabs(a);
b = fabs(b);
if (a < b) t = b, b = a, a = t;

1
libc/tinymath/hypotf.c
View File

@@ -24,7 +24,6 @@
float hypotf(float a, float b) {
float r, t;
if (isinf(a) || isinf(b)) return INFINITY;
if (isunordered(a, b)) return NAN;
a = fabsf(a);
b = fabsf(b);
if (a < b) t = b, b = a, a = t;

1
libc/tinymath/hypotl.c
View File

@@ -24,7 +24,6 @@
long double hypotl(long double a, long double b) {
long double r, t;
if (isinf(a) || isinf(b)) return INFINITY;
if (isunordered(a, b)) return NAN;
a = fabsl(a);
b = fabsl(b);
if (a < b) t = b, b = a, a = t;

3
libc/tinymath/log10.S
View File

@@ -23,7 +23,6 @@
//
// @param 𝑥 is double scalar in low half of %xmm0
// @return double scalar in low half of %xmm0
log10:
ezlea log10l,ax
log10: ezlea log10l,ax
jmp _d2ld2
.endfn log10,globl

3
libc/tinymath/log2.S
View File

@@ -22,8 +22,7 @@
//
// @param 𝑥 is a double passed in the lower quadword of %xmm0
// @return result in lower quadword of %xmm0
log2:
push %rbp
log2: push %rbp
mov %rsp,%rbp
.profilable
push %rax

3
libc/tinymath/log2f.S
View File

@@ -23,8 +23,7 @@
//
// @param 𝑥 is a float passed in the lower quarter of %xmm0
// @return result in lower quarter of %xmm0
log2f:
push %rbp
log2f: push %rbp
mov %rsp,%rbp
.profilable
push %rax