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commit 2506109403de69bd454de27835d42e6eb6ec3abc
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Wed Jun 12 10:36:48 2013 +0530
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Set/restore rounding mode only when needed
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The most common use case of math functions is with default rounding
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mode, i.e. rounding to nearest. Setting and restoring rounding mode
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is an unnecessary overhead for this, so I've added support for a
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context, which does the set/restore only if the FP status needs a
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change. The code is written such that only x86 uses these. Other
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architectures should be unaffected by it, but would definitely benefit
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if the set/restore has as much overhead relative to the rest of the
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code, as the x86 bits do.
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Here's a summary of the performance improvement due to these
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improvements; I've only mentioned functions that use the set/restore
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and have benchmark inputs for x86_64:
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Before:
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cos(): ITERS:4.69335e+08: TOTAL:28884.6Mcy, MAX:4080.28cy, MIN:57.562cy, 16248.6 calls/Mcy
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exp(): ITERS:4.47604e+08: TOTAL:28796.2Mcy, MAX:207.721cy, MIN:62.385cy, 15543.9 calls/Mcy
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pow(): ITERS:1.63485e+08: TOTAL:28879.9Mcy, MAX:362.255cy, MIN:172.469cy, 5660.86 calls/Mcy
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sin(): ITERS:3.89578e+08: TOTAL:28900Mcy, MAX:704.859cy, MIN:47.583cy, 13480.2 calls/Mcy
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tan(): ITERS:7.0971e+07: TOTAL:28902.2Mcy, MAX:1357.79cy, MIN:388.58cy, 2455.55 calls/Mcy
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After:
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cos(): ITERS:6.0014e+08: TOTAL:28875.9Mcy, MAX:364.283cy, MIN:45.716cy, 20783.4 calls/Mcy
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exp(): ITERS:5.48578e+08: TOTAL:28764.9Mcy, MAX:191.617cy, MIN:51.011cy, 19071.1 calls/Mcy
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pow(): ITERS:1.70013e+08: TOTAL:28873.6Mcy, MAX:689.522cy, MIN:163.989cy, 5888.18 calls/Mcy
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sin(): ITERS:4.64079e+08: TOTAL:28891.5Mcy, MAX:6959.3cy, MIN:36.189cy, 16062.8 calls/Mcy
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tan(): ITERS:7.2354e+07: TOTAL:28898.9Mcy, MAX:1295.57cy, MIN:380.698cy, 2503.7 calls/Mcy
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So the improvements are:
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cos: 27.9089%
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exp: 22.6919%
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pow: 4.01564%
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sin: 19.1585%
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tan: 1.96086%
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The downside of the change is that it will have an adverse performance
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impact on non-default rounding modes, but I think the tradeoff is
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justified.
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diff --git glibc-2.17-c758a686/include/fenv.h glibc-2.17-c758a686/include/fenv.h
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index ed6d139..9f90d17 100644
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--- glibc-2.17-c758a686/include/fenv.h
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+++ glibc-2.17-c758a686/include/fenv.h
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@@ -1,5 +1,6 @@
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#ifndef _FENV_H
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#include <math/fenv.h>
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+#include <stdbool.h>
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#ifndef _ISOMAC
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/* Now define the internal interfaces. */
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@@ -23,4 +24,13 @@ libm_hidden_proto (fetestexcept)
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libm_hidden_proto (feclearexcept)
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#endif
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+/* Rounding mode context. This allows functions to set/restore rounding mode
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+ only when the desired rounding mode is different from the current rounding
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+ mode. */
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+struct rm_ctx
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+{
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+ fenv_t env;
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+ bool updated_status;
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+};
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+
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#endif
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diff --git glibc-2.17-c758a686/sysdeps/generic/math_private.h glibc-2.17-c758a686/sysdeps/generic/math_private.h
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index e98360d..c0fc03d 100644
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--- glibc-2.17-c758a686/sysdeps/generic/math_private.h
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+++ glibc-2.17-c758a686/sysdeps/generic/math_private.h
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@@ -553,35 +553,62 @@ default_libc_feupdateenv_test (fenv_t *e, int ex)
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# define libc_feresetround_noexl libc_fesetenvl
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#endif
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+#if HAVE_RM_CTX
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+/* Set/Restore Rounding Modes only when necessary. If defined, these functions
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+ set/restore floating point state only if the state needed within the lexical
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+ block is different from the current state. This saves a lot of time when
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+ the floating point unit is much slower than the fixed point units. */
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+
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+# ifndef libc_feresetround_noex_ctx
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+# define libc_feresetround_noex_ctx libc_fesetenv_ctx
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+# endif
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+# ifndef libc_feresetround_noexf_ctx
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+# define libc_feresetround_noexf_ctx libc_fesetenvf_ctx
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+# endif
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+# ifndef libc_feresetround_noexl_ctx
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+# define libc_feresetround_noexl_ctx libc_fesetenvl_ctx
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+# endif
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+
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+# ifndef libc_feholdsetround_53bit_ctx
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+# define libc_feholdsetround_53bit_ctx libc_feholdsetround_ctx
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+# endif
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+
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+# ifndef libc_feresetround_53bit_ctx
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+# define libc_feresetround_53bit_ctx libc_feresetround_ctx
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+# endif
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+
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+# define SET_RESTORE_ROUND_GENERIC(RM,ROUNDFUNC,CLEANUPFUNC) \
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+ struct rm_ctx ctx __attribute__((cleanup(CLEANUPFUNC ## _ctx))); \
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+ ROUNDFUNC ## _ctx (&ctx, (RM))
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+#else
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+# define SET_RESTORE_ROUND_GENERIC(RM, ROUNDFUNC, CLEANUPFUNC) \
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+ fenv_t __libc_save_rm __attribute__((cleanup(CLEANUPFUNC))); \
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+ ROUNDFUNC (&__libc_save_rm, (RM))
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+#endif
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+
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/* Save and restore the rounding mode within a lexical block. */
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#define SET_RESTORE_ROUND(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround))); \
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- libc_feholdsetround (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround, libc_feresetround)
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#define SET_RESTORE_ROUNDF(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetroundf))); \
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- libc_feholdsetroundf (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundf, libc_feresetroundf)
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#define SET_RESTORE_ROUNDL(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetroundl))); \
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- libc_feholdsetroundl (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundl, libc_feresetroundl)
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/* Save and restore the rounding mode within a lexical block, and also
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the set of exceptions raised within the block may be discarded. */
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#define SET_RESTORE_ROUND_NOEX(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noex))); \
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- libc_feholdsetround (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround, libc_feresetround_noex)
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#define SET_RESTORE_ROUND_NOEXF(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noexf))); \
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- libc_feholdsetroundf (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundf, libc_feresetround_noexf)
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#define SET_RESTORE_ROUND_NOEXL(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noexl))); \
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- libc_feholdsetroundl (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundl, libc_feresetround_noexl)
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/* Like SET_RESTORE_ROUND, but also set rounding precision to 53 bits. */
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#define SET_RESTORE_ROUND_53BIT(RM) \
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- fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_53bit))); \
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- libc_feholdsetround_53bit (&__libc_save_rm, (RM))
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+ SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround_53bit, \
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+ libc_feresetround_53bit)
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#define __nan(str) \
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(__builtin_constant_p (str) && str[0] == '\0' ? NAN : __nan (str))
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diff --git glibc-2.17-c758a686/sysdeps/i386/fpu/fenv_private.h glibc-2.17-c758a686/sysdeps/i386/fpu/fenv_private.h
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index 1f8336c..3998387 100644
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--- glibc-2.17-c758a686/sysdeps/i386/fpu/fenv_private.h
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+++ glibc-2.17-c758a686/sysdeps/i386/fpu/fenv_private.h
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@@ -322,6 +322,179 @@ libc_feresetround_387 (fenv_t *e)
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# define libc_feholdsetround_53bit libc_feholdsetround_387_53bit
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#endif
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+/* We have support for rounding mode context. */
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+#define HAVE_RM_CTX 1
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+
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+static __always_inline void
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+libc_feholdexcept_setround_sse_ctx (struct rm_ctx *ctx, int r)
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+{
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+ unsigned int mxcsr, new_mxcsr;
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+ asm (STMXCSR " %0" : "=m" (*&mxcsr));
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+ new_mxcsr = ((mxcsr | 0x1f80) & ~0x603f) | (r << 3);
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+
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+ ctx->env.__mxcsr = mxcsr;
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+ if (__glibc_unlikely (mxcsr != new_mxcsr))
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+ {
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+ asm volatile (LDMXCSR " %0" : : "m" (*&new_mxcsr));
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+ ctx->updated_status = true;
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+ }
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+ else
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+ ctx->updated_status = false;
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+}
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+
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+/* Unconditional since we want to overwrite any exceptions that occurred in the
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+ context. This is also why all fehold* functions unconditionally write into
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+ ctx->env. */
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+static __always_inline void
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+libc_fesetenv_sse_ctx (struct rm_ctx *ctx)
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+{
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+ libc_fesetenv_sse (&ctx->env);
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+}
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+
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+static __always_inline void
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+libc_feupdateenv_sse_ctx (struct rm_ctx *ctx)
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+{
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+ if (__glibc_unlikely (ctx->updated_status))
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+ libc_feupdateenv_test_sse (&ctx->env, 0);
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+}
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+
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+static __always_inline void
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+libc_feholdexcept_setround_387_prec_ctx (struct rm_ctx *ctx, int r)
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+{
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+ libc_feholdexcept_387 (&ctx->env);
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+
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+ fpu_control_t cw = ctx->env.__control_word;
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+ fpu_control_t old_cw = cw;
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+ cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
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+ cw |= r | 0x3f;
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+
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+ if (__glibc_unlikely (old_cw != cw))
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+ {
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+ _FPU_SETCW (cw);
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+ ctx->updated_status = true;
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+ }
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+ else
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+ ctx->updated_status = false;
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+}
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+
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+static __always_inline void
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+libc_feholdexcept_setround_387_ctx (struct rm_ctx *ctx, int r)
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+{
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+ libc_feholdexcept_setround_387_prec_ctx (ctx, r | _FPU_EXTENDED);
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+}
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+
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+static __always_inline void
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+libc_feholdexcept_setround_387_53bit_ctx (struct rm_ctx *ctx, int r)
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+{
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+ libc_feholdexcept_setround_387_prec_ctx (ctx, r | _FPU_DOUBLE);
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+}
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+
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+static __always_inline void
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+libc_feholdsetround_387_prec_ctx (struct rm_ctx *ctx, int r)
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+{
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+ fpu_control_t cw, new_cw;
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+
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+ _FPU_GETCW (cw);
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+ new_cw = cw;
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+ new_cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
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+ new_cw |= r;
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+
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+ ctx->env.__control_word = cw;
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+ if (__glibc_unlikely (new_cw != cw))
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+ {
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+ _FPU_SETCW (new_cw);
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+ ctx->updated_status = true;
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+ }
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+ else
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+ ctx->updated_status = false;
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+}
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+
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+static __always_inline void
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+libc_feholdsetround_387_ctx (struct rm_ctx *ctx, int r)
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+{
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+ libc_feholdsetround_387_prec_ctx (ctx, r | _FPU_EXTENDED);
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+}
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+
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+static __always_inline void
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+libc_feholdsetround_387_53bit_ctx (struct rm_ctx *ctx, int r)
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+{
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+ libc_feholdsetround_387_prec_ctx (ctx, r | _FPU_DOUBLE);
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+}
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+
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+static __always_inline void
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+libc_feholdsetround_sse_ctx (struct rm_ctx *ctx, int r)
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+{
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+ unsigned int mxcsr, new_mxcsr;
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+
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+ asm (STMXCSR " %0" : "=m" (*&mxcsr));
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+ new_mxcsr = (mxcsr & ~0x6000) | (r << 3);
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+
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+ ctx->env.__mxcsr = mxcsr;
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+ if (__glibc_unlikely (new_mxcsr != mxcsr))
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+ {
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+ asm volatile (LDMXCSR " %0" : : "m" (*&new_mxcsr));
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+ ctx->updated_status = true;
|
|
|
ce426f |
+ }
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|
|
ce426f |
+ else
|
|
|
ce426f |
+ ctx->updated_status = false;
|
|
|
ce426f |
+}
|
|
|
ce426f |
+
|
|
|
ce426f |
+static __always_inline void
|
|
|
ce426f |
+libc_feresetround_sse_ctx (struct rm_ctx *ctx)
|
|
|
ce426f |
+{
|
|
|
ce426f |
+ if (__glibc_unlikely (ctx->updated_status))
|
|
|
ce426f |
+ libc_feresetround_sse (&ctx->env);
|
|
|
ce426f |
+}
|
|
|
ce426f |
+
|
|
|
ce426f |
+static __always_inline void
|
|
|
ce426f |
+libc_feresetround_387_ctx (struct rm_ctx *ctx)
|
|
|
ce426f |
+{
|
|
|
ce426f |
+ if (__glibc_unlikely (ctx->updated_status))
|
|
|
ce426f |
+ _FPU_SETCW (ctx->env.__control_word);
|
|
|
ce426f |
+}
|
|
|
ce426f |
+
|
|
|
ce426f |
+static __always_inline void
|
|
|
ce426f |
+libc_feupdateenv_387_ctx (struct rm_ctx *ctx)
|
|
|
ce426f |
+{
|
|
|
ce426f |
+ if (__glibc_unlikely (ctx->updated_status))
|
|
|
ce426f |
+ libc_feupdateenv_test_387 (&ctx->env, 0);
|
|
|
ce426f |
+}
|
|
|
ce426f |
+
|
|
|
ce426f |
+#ifdef __SSE_MATH__
|
|
|
ce426f |
+# define libc_feholdexcept_setroundf_ctx libc_feholdexcept_setround_sse_ctx
|
|
|
ce426f |
+# define libc_fesetenvf_ctx libc_fesetenv_sse_ctx
|
|
|
ce426f |
+# define libc_feupdateenvf_ctx libc_feupdateenv_sse_ctx
|
|
|
ce426f |
+# define libc_feholdsetroundf_ctx libc_feholdsetround_sse_ctx
|
|
|
ce426f |
+# define libc_feresetroundf_ctx libc_feresetround_sse_ctx
|
|
|
ce426f |
+#else
|
|
|
ce426f |
+# define libc_feholdexcept_setroundf_ctx libc_feholdexcept_setround_387_ctx
|
|
|
ce426f |
+# define libc_feupdateenvf_ctx libc_feupdateenv_387_ctx
|
|
|
ce426f |
+# define libc_feholdsetroundf_ctx libc_feholdsetround_387_ctx
|
|
|
ce426f |
+# define libc_feresetroundf_ctx libc_feresetround_387_ctx
|
|
|
ce426f |
+#endif /* __SSE_MATH__ */
|
|
|
ce426f |
+
|
|
|
ce426f |
+#ifdef __SSE2_MATH__
|
|
|
ce426f |
+# define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_sse_ctx
|
|
|
ce426f |
+# define libc_fesetenv_ctx libc_fesetenv_sse_ctx
|
|
|
ce426f |
+# define libc_feupdateenv_ctx libc_feupdateenv_sse_ctx
|
|
|
ce426f |
+# define libc_feholdsetround_ctx libc_feholdsetround_sse_ctx
|
|
|
ce426f |
+# define libc_feresetround_ctx libc_feresetround_sse_ctx
|
|
|
ce426f |
+#else
|
|
|
ce426f |
+# define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_387_ctx
|
|
|
ce426f |
+# define libc_feupdateenv_ctx libc_feupdateenv_387_ctx
|
|
|
ce426f |
+# define libc_feresetround_ctx libc_feresetround_387_ctx
|
|
|
ce426f |
+#endif /* __SSE2_MATH__ */
|
|
|
ce426f |
+
|
|
|
ce426f |
+#define libc_feholdexcept_setroundl_ctx libc_feholdexcept_setround_387_ctx
|
|
|
ce426f |
+#define libc_feupdateenvl_ctx libc_feupdateenv_387_ctx
|
|
|
ce426f |
+#define libc_feholdsetroundl_ctx libc_feholdsetround_387_ctx
|
|
|
ce426f |
+#define libc_feresetroundl_ctx libc_feresetround_387_ctx
|
|
|
ce426f |
+
|
|
|
ce426f |
+#ifndef __SSE2_MATH__
|
|
|
ce426f |
+# define libc_feholdsetround_53bit_ctx libc_feholdsetround_387_53bit_ctx
|
|
|
ce426f |
+# define libc_feresetround_53bit_ctx libc_feresetround_387_ctx
|
|
|
ce426f |
+#endif
|
|
|
ce426f |
+
|
|
|
ce426f |
#undef __mxcsr
|
|
|
ce426f |
|
|
|
ce426f |
#endif /* FENV_PRIVATE_H */
|