зеркало из https://github.com/mozilla/pjs.git
Efficient Implementation of JSDOUBLE_IS_INT using SSE2 (original patch by Moh Haghighat/Intel, bug 530896, r=dvander).
This commit is contained in:
Andreas Gal
Родитель
6b6c52554e
Коммит
4045984def
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@ -2476,6 +2476,42 @@ if test -z "$COMPILE_ENVIRONMENT"; then
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SKIP_LIBRARY_CHECKS=1
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fi
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dnl Configure SSE2 support
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dnl Enable SSE2 support in the compiler if available.
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dnl ========================================================
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case "$target" in
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i?86-*|x86_64*-*)
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if test "$GNU_CC"; then
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CFLAGS="$CFLAGS -msse2"
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fi
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if test "$GNU_CXX"; then
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CXXFLAGS="$CXXFLAGS -msse2"
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fi
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;;
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esac
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dnl If we have the proper include file, enable SSE2 support.
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dnl ========================================================
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HAVE_SSE2=
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AC_CHECK_HEADER(xmmintrin.h, HAVE_SSE2=1)
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AC_CHECK_HEADER(emmintrin.h, HAVE_SSE2=1 && AC_DEFINE(USE_EMM_INTRIN))
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if test "$HAVE_SSE2"; then
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AC_DEFINE(HAVE_SSE2)
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case "$target_os" in
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darwin*)
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;;
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*)
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case "$target" in
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i?86-*)
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AC_DEFINE(MUST_DETECT_SSE2)
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;;
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esac
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;;
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esac
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fi
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dnl Configure JIT support
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case "$target" in
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@ -825,6 +825,9 @@ JSRuntime::~JSRuntime()
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JS_PUBLIC_API(JSRuntime *)
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JS_NewRuntime(uint32 maxbytes)
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{
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#ifdef MUST_DETECT_SSE2
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js_use_SSE2 = js_DetectSSE2();
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#endif
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#ifdef DEBUG
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if (!js_NewRuntimeWasCalled) {
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/*
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@ -47,6 +47,13 @@
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#ifdef SOLARIS
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#include <ieeefp.h>
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#endif
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#ifdef HAVE_SSE2
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#ifdef USE_EMM_INTRIN
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#include <emmintrin.h>
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#else
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#include <xmmintrin.h>
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#endif
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#endif
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/*
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* JS number (IEEE double) interface.
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@ -131,9 +138,32 @@ JSDOUBLE_IS_NEGZERO(jsdouble d)
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#define JSDOUBLE_HI32_EXPMASK 0x7ff00000
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#define JSDOUBLE_HI32_MANTMASK 0x000fffff
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static inline int
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/* Older versions of MSVC don't have _mm_castpd_si128. */
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#if defined(HAVE_SSE2) && defined (_MSC_VER) && (_MSC_VER < 1500)
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static inline __m128i
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_mm_castpd_si128(__m128d v) {
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return *(__m128i *)&v;
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}
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#endif
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static inline bool
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JSDOUBLE_IS_INT(jsdouble d, jsint& i)
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{
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#ifdef HAVE_SSE2
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if (js_use_SSE2) {
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__m128d xd = _mm_set_sd(d); /* load double into an XMM register */
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int ii = _mm_cvtsd_si32(xd); /* Inf/NaN & large |d| convert to -2^31 */
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__m128d xdi = _mm_setzero_pd(); /* kill dependencies for the top half of xdi */
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xdi = _mm_cvtsi32_sd(xdi, ii); /* convert the result back to double */
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__m128i xcmp = _mm_cmpeq_epi32(_mm_castpd_si128(xd), /* 32-bit integer bit-to-bit */
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_mm_castpd_si128(xdi)); /* comparison */
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int m = _mm_movemask_epi8(xcmp); /* extract significant bits of compare */
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if ((m & 0xff) != 0xff) /* result is non-integer? */
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return false;
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i = ii;
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return true;
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}
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#endif
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if (JSDOUBLE_IS_NEGZERO(d))
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return false;
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return d == (i = jsint(d));
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@ -74,6 +74,7 @@
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#include "jsscript.h"
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#include "jsstaticcheck.h"
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#include "jstracer.h"
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#include "jsutil.h"
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#include "jsxml.h"
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#include "jsatominlines.h"
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@ -7200,50 +7201,6 @@ js_AbortRecording(JSContext* cx, const char* reason)
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#endif
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}
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#if defined NANOJIT_IA32
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static bool
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CheckForSSE2()
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{
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char *c = getenv("X86_FORCE_SSE2");
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if (c)
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return (!strcmp(c, "true") ||
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!strcmp(c, "1") ||
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!strcmp(c, "yes"));
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int features = 0;
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#if defined _MSC_VER
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__asm
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{
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pushad
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mov eax, 1
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cpuid
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mov features, edx
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popad
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}
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#elif defined __GNUC__
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asm("xchg %%esi, %%ebx\n" /* we can't clobber ebx on gcc (PIC register) */
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"mov $0x01, %%eax\n"
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"cpuid\n"
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"mov %%edx, %0\n"
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"xchg %%esi, %%ebx\n"
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: "=m" (features)
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: /* We have no inputs */
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: "%eax", "%esi", "%ecx", "%edx"
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);
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#elif defined __SUNPRO_C || defined __SUNPRO_CC
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asm("push %%ebx\n"
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"mov $0x01, %%eax\n"
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"cpuid\n"
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"pop %%ebx\n"
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: "=d" (features)
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: /* We have no inputs */
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: "%eax", "%ecx"
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);
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#endif
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return (features & (1<<26)) != 0;
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}
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#endif
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#if defined(NANOJIT_ARM)
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#if defined(_MSC_VER) && defined(WINCE)
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@ -7505,7 +7462,7 @@ js_InitJIT(JSTraceMonitor *tm)
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if (!did_we_check_processor_features) {
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#if defined NANOJIT_IA32
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avmplus::AvmCore::config.use_cmov =
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avmplus::AvmCore::config.sse2 = CheckForSSE2();
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avmplus::AvmCore::config.sse2 = js_use_SSE2;
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avmplus::AvmCore::config.fixed_esp = true;
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#endif
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#if defined NANOJIT_ARM
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@ -43,6 +43,7 @@
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "jstypes.h"
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#include "jsstdint.h"
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#include "jsutil.h"
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@ -71,6 +72,52 @@ JS_PUBLIC_API(void) JS_Assert(const char *s, const char *file, JSIntn ln)
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#endif
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}
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#ifdef MUST_DETECT_SSE2
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bool js_use_SSE2;
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bool
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js_DetectSSE2()
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{
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char *c = getenv("X86_FORCE_SSE2");
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if (c)
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return (!strcmp(c, "true") ||
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!strcmp(c, "1") ||
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!strcmp(c, "yes"));
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int features = 0;
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#if defined _MSC_VER
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__asm
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{
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pushad
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mov eax, 1
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cpuid
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mov features, edx
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popad
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}
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#elif defined __GNUC__
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asm("xchg %%esi, %%ebx\n" /* we can't clobber ebx on gcc (PIC register) */
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"mov $0x01, %%eax\n"
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"cpuid\n"
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"mov %%edx, %0\n"
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"xchg %%esi, %%ebx\n"
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: "=m" (features)
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: /* We have no inputs */
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: "%eax", "%esi", "%ecx", "%edx"
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);
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#elif defined __SUNPRO_C || defined __SUNPRO_CC
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asm("push %%ebx\n"
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"mov $0x01, %%eax\n"
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"cpuid\n"
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"pop %%ebx\n"
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: "=d" (features)
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: /* We have no inputs */
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: "%eax", "%ecx"
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);
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#endif
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return (features & (1<<26)) != 0;
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}
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#endif
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#ifdef JS_BASIC_STATS
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#include <math.h>
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@ -74,6 +74,17 @@ JS_Assert(const char *s, const char *file, JSIntn ln);
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#endif /* defined(DEBUG) */
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#ifdef HAVE_SSE2
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#ifdef MUST_DETECT_SSE2
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extern bool js_use_SSE2;
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bool
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js_DetectSSE2();
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#else
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static const bool js_use_SSE2 = true;
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#endif
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#endif
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/*
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* Compile-time assert. "cond" must be a constant expression.
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* The macro can be used only in places where an "extern" declaration is
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