From 8b954ab9b808a51d8cf6a90c7d1d46a3366e3274 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Mon, 14 Jan 2013 21:47:29 -0800 Subject: Optimize sparc {ceil,floor}{,f} using vis2 'siam' instruction. * sysdeps/sparc/sparc-ifunc.h (SPARC_ASM_IFUNC2): New macro. (SPARC_ASM_VIS2_IFUNC): Likewise. (SPARC_ASM_VIS3_VIS2_IFUNC): Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_ceil-vis3.S: Make use of 'siam' instruction. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_ceilf-vis3.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floorf-vis3.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-vis3.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceilf-vis3.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_floor-vis3.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_floorf-vis3.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_ceil-vis2.S: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_ceilf-vis2.S: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis2.S: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floorf-vis2.S: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceil-vis2.S: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceilf-vis2.S: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_floor-vis2.S: New file. * sysdeps/sparc/sparc64/fpu/multiarch/s_floorf-vis2.S: New file. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_ceil.S: Hook in new VIS2 routines. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_ceilf.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floorf.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceil.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_ceilf.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_floor.S: Likewise. * sysdeps/sparc/sparc64/fpu/multiarch/s_floorf.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile: Add new VIS2 routines to libm-sysdep_routines. * sysdeps/sparc/sparc64/fpu/multiarch/Makefile: Likewise. --- .../sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S | 40 +++++++--------------- 1 file changed, 12 insertions(+), 28 deletions(-) (limited to 'sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S') diff --git a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S index 8445f1d7a6..41fdfac3b3 100644 --- a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S +++ b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_floor-vis3.S @@ -19,27 +19,21 @@ #include - /* Since changing the rounding mode is extremely expensive, we - try to round up using a method that is rounding mode - agnostic. + /* 'siam' (Set Interval Arithmetic Mode) is used to quickly override + the rounding mode during this routine. We add then subtract (or subtract than add if the initial value was negative) 2**23 to the value, then subtract it back out. - This will clear out the fractional portion of the value. - One of two things will happen for non-whole initial values. - Either the rounding mode will round it up, or it will be - rounded down. If the value started out whole, it will be - equal after the addition and subtraction. This means we - can accurately detect with one test whether we need to add - another 1.0 to round it up properly. + This will clear out the fractional portion of the value and, + with suitable 'siam' initiated rouding mode settings, round + the final result in the proper direction. - VIS instructions are used to facilitate the formation of - easier constants, and the propagation of the sign bit. */ + We also use VIS3 moves to avoid using the stack to transfer + values between float and integer registers. */ #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ -#define ONE_DOT_ZERO 0x3ff00000 /* 1.0 */ #define ZERO %f10 /* 0.0 */ #define SIGN_BIT %f12 /* -0.0 */ @@ -47,32 +41,22 @@ ENTRY (__floor_vis3) sethi %hi(TWO_FIFTYTWO), %o2 sllx %o0, 32, %o0 - sethi %hi(ONE_DOT_ZERO), %o3 + sllx %o2, 32, %o2 or %o0, %o1, %o0 movxtod %o0, %f0 - sllx %o2, 32, %o2 fzero ZERO - sllx %o3, 32, %o3 - fnegd ZERO, SIGN_BIT - movxtod %o2, %f16 fabsd %f0, %f14 - fcmpd %fcc3, %f14, %f16 - fmovduge %fcc3, ZERO, %f16 fand %f0, SIGN_BIT, SIGN_BIT - for %f16, SIGN_BIT, %f16 + siam (1 << 2) | 3 faddd %f0, %f16, %f18 + siam (1 << 2) | 0 fsubd %f18, %f16, %f18 - fcmpd %fcc2, %f18, %f0 - movxtod %o3, %f20 - - fmovdule %fcc2, ZERO, %f20 - fsubd %f18, %f20, %f0 - fabsd %f0, %f0 + siam (0 << 2) retl - for %f0, SIGN_BIT, %f0 + for %f18, SIGN_BIT, %f0 END (__floor_vis3) -- cgit 1.4.1