mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-07-04 18:28:30 +00:00
Improve dead code elimination
This commit is contained in:
Justine Tunney
parent
760db8c5ad
commit
0e36cb3ac4
6606 changed files with 9685 additions and 9854 deletions
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@ -22,7 +22,6 @@
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#include "libc/sysv/consts/nr.h"
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#include "libc/macros.h"
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.privileged
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.source __FILE__
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/ Terminates program abnormally.
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/
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@ -38,8 +37,10 @@ abort: push %rbp
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mov %rsp,%rbp
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and $-16,%rsp
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sub $16,%rsp
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#if SupportsWindows()
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testb IsWindows()
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jnz 2f
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jnz sys_abort_nt
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#endif
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mov SIG_SETMASK,%edi
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mov %rsp,%rsi
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push $0xffffffffffffffdf # all bits blocked but SIGABRT
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@ -56,5 +57,5 @@ abort: push %rbp
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mov SIGABRT,%esi
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mov __NR_kill,%eax
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syscall # avoid hook and less bt noise
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2: call sys_abort_nt
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call _Exit
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.endfn abort,globl,protected
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@ -30,23 +30,6 @@
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_construct:
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push %rbp
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mov %rsp,%rbp
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ezlea __init_array_start,ax # static ctors in forward order
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.weak __init_array_start # could be called multiple times
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ezlea __init_array_end,cx # idempotency recommended
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.weak __init_array_end # @see ape/ape.lds
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1: cmp %rax,%rcx
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je 2f
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push %rax
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push %rcx
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mov %r12,%rdi
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mov %r13,%rsi
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mov %r14,%rdx
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mov %r15,%rcx
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call *(%rax)
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pop %rcx
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pop %rax
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add $8,%rax
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jmp 1b
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2: pop %rbp
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pop %rbp
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ret
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.endfn _construct,globl
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@ -23,7 +23,6 @@
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#include "libc/sysv/consts/map.h"
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#include "libc/dce.h"
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.text.startup
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.source __FILE__
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/ Cosmopolitan runtime.
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/
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@ -34,30 +33,48 @@
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/ @noreturn
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cosmo: push %rbp
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mov %rsp,%rbp
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ezlea _base,bx
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mov %edi,%r12d
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mov %rsi,%r13
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mov %rdx,%r14
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mov %rcx,%r15
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#ifdef __FAST_MATH__
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call __fast_math
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push %rax
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stmxcsr (%rsp)
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orl $0x8040,(%rsp)
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ldmxcsr (%rsp)
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pop %rax
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#endif
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call _init
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call _construct
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ezlea __init_array_start,ax # static ctors in forward order
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.weak __init_array_start # could be called multiple times
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ezlea __init_array_end,cx # idempotency recommended
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.weak __init_array_end # @see ape/ape.lds
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1: cmp %rax,%rcx
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je 2f
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push %rax
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push %rcx
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call .Largs
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call *(%rax)
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pop %rcx
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pop %rax
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add $8,%rax
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jmp 1b
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2: nop
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#if !IsTrustworthy()
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mov $PROT_READ,%edi
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call _piro
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#endif
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mov %r12d,%edi
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mov %r13,%rsi
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mov %r14,%rdx
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mov %r15,%rcx
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call .Largs
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.weak main
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call main
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xchg %eax,%edi
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call exit
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.endfn cosmo,weak,hidden
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ud2
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.Largs: mov %r12d,%edi
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mov %r13,%rsi
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mov %r14,%rdx
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mov %r15,%rcx
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ret
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.endfn cosmo,weak
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#ifdef __PG__
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.init.start 800,_init_ftrace
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@ -1,45 +0,0 @@
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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#include "libc/notice.inc"
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.text.startup
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.source __FILE__
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/ Intel Manual V.1 §10.2.3 - MXCSR Control and Status Register
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#define MXCSR_DE (1 << 1) /* Denormal Flag */
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#define MXCSR_DAZ (1 << 6) /* Denormals Are Zeros */
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#define MXCSR_DM (1 << 8) /* Denormal Operation Mask */
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#define MXCSR_FTZ (1 << 15) /* Flush to Zero */
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/ Initializes fast math.
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/
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/ “Seymour Cray didn't care that 81.0/3.0 did not give exactly
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/ 27.0 on the CDC 6000 class machines, and he was universally
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/ respected for making the fastest machines around.
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/ ──Linus Torvalds
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__fast_math:
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push %rbp
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mov %rsp,%rbp
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push %rax
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stmxcsr (%rsp)
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orl $MXCSR_FTZ+MXCSR_DAZ,(%rsp)
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ldmxcsr (%rsp)
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leave
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ret
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.endfn __fast_math,globl
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@ -16,7 +16,6 @@
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/progn.internal.h"
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#include "libc/bits/safemacros.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/interruptiblecall.h"
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@ -53,7 +52,8 @@ intptr_t interruptiblecall(struct InterruptibleCall *icall,
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icall->sa_new.sa_handler = interruptcall;
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icall->sa_new.sa_flags |= SA_RESTART | SA_RESETHAND;
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if ((rc = (sigaction)(icall->sig, &icall->sa_new, &icall->sa_old)) != -1) {
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g_interruptiblecall = PROGN((icall->prev = g_interruptiblecall), icall);
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icall->prev = g_interruptiblecall;
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g_interruptiblecall = icall;
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if (!setjmp(icall->jb)) {
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icall->returnval = rc = callback(p1, p2, p3, p4);
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} else {
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@ -69,7 +69,6 @@ int mprotect(void *, uint64_t, int) privileged;
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int msync(void *, size_t, int);
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void __print(const void *, size_t);
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void __print_string(const char *);
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void __fast_math(void);
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void *sbrk(intptr_t);
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int brk(void *);
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int NtGetVersion(void);
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@ -16,6 +16,7 @@
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/macros.h"
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#include "libc/runtime/memtrack.h"
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@ -23,5 +24,9 @@ int UntrackMemoryIntervals(void *addr, size_t size) {
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int a, b;
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a = ROUNDDOWN((intptr_t)addr, FRAMESIZE) >> 16;
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b = ROUNDDOWN((intptr_t)addr + size - 1, FRAMESIZE) >> 16;
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return ReleaseMemoryIntervals(&_mmi, a, b, ReleaseMemoryNt);
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if (SupportsWindows()) {
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return ReleaseMemoryIntervals(&_mmi, a, b, ReleaseMemoryNt);
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} else {
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return ReleaseMemoryIntervals(&_mmi, a, b, 0);
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}
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}
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