Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932414AbbKMAre (ORCPT ); Thu, 12 Nov 2015 19:47:34 -0500 Received: from mailapp01.imgtec.com ([195.59.15.196]:9827 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932108AbbKMArc (ORCPT ); Thu, 12 Nov 2015 19:47:32 -0500 Date: Fri, 13 Nov 2015 00:47:28 +0000 From: "Maciej W. Rozycki" To: Ralf Baechle CC: Andrew Morton , Matthew Fortune , , Subject: [PATCH 4/8] MIPS: math-emu: Add IEEE Std 754-2008 NaN encoding emulation In-Reply-To: Message-ID: References: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" X-Originating-IP: [10.100.200.62] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 16599 Lines: 425 Implement IEEE Std 754-2008 NaN encoding wired to the state of the FCSR.NAN2008 bit. Make the interpretation of the quiet bit in NaN data as follows: * in the legacy mode originally defined by the MIPS architecture the value of 1 denotes an sNaN whereas the value of 0 denotes a qNaN, * in the 2008 mode introduced with revision 5 of the MIPS architecture the value of 0 denotes an sNaN whereas the value of 1 denotes a qNaN, following the definition of the preferred NaN encoding introduced with IEEE Std 754-2008. In the 2008 mode, following the requirement of the said standard, quiet an sNaN where needed by setting the quiet bit to 1 and leaving all the NaN payload bits unchanged. Update format conversion operations according to the rules set by IEEE Std 754-2008 and the MIPS architecture. Specifically: * propagate NaN payload bits through conversions between floating-point formats such that as much information as possible is preserved and specifically a conversion from a narrower format to a wider format and then back to the original format does not change a qNaN payload in any way, * conversions from a floating-point to an integer format where the source is a NaN, infinity or a value that would convert to an integer outside the range of the result format produce, under the default exception handling, the respective values defined by the MIPS architecture. In full FPU emulation set the FIR.HAS2008 bit to 1, however do not make any further FCSR bits writable. Signed-off-by: Maciej W. Rozycki --- linux-mips-emu-nan2008.diff Index: linux-sfr-test/arch/mips/kernel/cpu-probe.c =================================================================== --- linux-sfr-test.orig/arch/mips/kernel/cpu-probe.c 2015-09-04 21:34:10.000000000 +0100 +++ linux-sfr-test/arch/mips/kernel/cpu-probe.c 2015-09-04 21:35:56.582838000 +0100 @@ -113,6 +113,8 @@ static void cpu_set_nofpu_id(struct cpui if (c->isa_level & (MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) value |= MIPS_FPIR_F64 | MIPS_FPIR_L | MIPS_FPIR_W; + if (c->options & MIPS_CPU_NAN_2008) + value |= MIPS_FPIR_HAS2008; c->fpu_id = value; } Index: linux-sfr-test/arch/mips/math-emu/dp_tint.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/dp_tint.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/dp_tint.c 2015-09-04 21:35:56.587767000 +0100 @@ -38,10 +38,13 @@ int ieee754dp_tint(union ieee754dp x) switch (xc) { case IEEE754_CLASS_SNAN: case IEEE754_CLASS_QNAN: - case IEEE754_CLASS_INF: ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754si_indef(); + case IEEE754_CLASS_INF: + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754si_overflow(xs); + case IEEE754_CLASS_ZERO: return 0; @@ -53,7 +56,7 @@ int ieee754dp_tint(union ieee754dp x) /* Set invalid. We will only use overflow for floating point overflow */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754si_indef(); + return ieee754si_overflow(xs); } /* oh gawd */ if (xe > DP_FBITS) { @@ -93,7 +96,7 @@ int ieee754dp_tint(union ieee754dp x) if ((xm >> 31) != 0 && (xs == 0 || xm != 0x80000000)) { /* This can happen after rounding */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754si_indef(); + return ieee754si_overflow(xs); } if (round || sticky) ieee754_setcx(IEEE754_INEXACT); Index: linux-sfr-test/arch/mips/math-emu/dp_tlong.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/dp_tlong.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/dp_tlong.c 2015-09-04 21:35:56.589811000 +0100 @@ -38,10 +38,13 @@ s64 ieee754dp_tlong(union ieee754dp x) switch (xc) { case IEEE754_CLASS_SNAN: case IEEE754_CLASS_QNAN: - case IEEE754_CLASS_INF: ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754di_indef(); + case IEEE754_CLASS_INF: + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754di_overflow(xs); + case IEEE754_CLASS_ZERO: return 0; @@ -56,7 +59,7 @@ s64 ieee754dp_tlong(union ieee754dp x) /* Set invalid. We will only use overflow for floating point overflow */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754di_indef(); + return ieee754di_overflow(xs); } /* oh gawd */ if (xe > DP_FBITS) { @@ -97,7 +100,7 @@ s64 ieee754dp_tlong(union ieee754dp x) if ((xm >> 63) != 0) { /* This can happen after rounding */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754di_indef(); + return ieee754di_overflow(xs); } if (round || sticky) ieee754_setcx(IEEE754_INEXACT); Index: linux-sfr-test/arch/mips/math-emu/ieee754.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/ieee754.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/ieee754.c 2015-09-04 21:35:56.592775000 +0100 @@ -59,7 +59,8 @@ const union ieee754dp __ieee754dp_spcval DPCNST(1, 3, 0x4000000000000ULL), /* - 10.0 */ DPCNST(0, DP_EMAX + 1, 0x0000000000000ULL), /* + infinity */ DPCNST(1, DP_EMAX + 1, 0x0000000000000ULL), /* - infinity */ - DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL), /* + indef quiet Nan */ + DPCNST(0, DP_EMAX + 1, 0x7FFFFFFFFFFFFULL), /* + ind legacy qNaN */ + DPCNST(0, DP_EMAX + 1, 0x8000000000000ULL), /* + indef 2008 qNaN */ DPCNST(0, DP_EMAX, 0xFFFFFFFFFFFFFULL), /* + max */ DPCNST(1, DP_EMAX, 0xFFFFFFFFFFFFFULL), /* - max */ DPCNST(0, DP_EMIN, 0x0000000000000ULL), /* + min normal */ @@ -82,7 +83,8 @@ const union ieee754sp __ieee754sp_spcval SPCNST(1, 3, 0x200000), /* - 10.0 */ SPCNST(0, SP_EMAX + 1, 0x000000), /* + infinity */ SPCNST(1, SP_EMAX + 1, 0x000000), /* - infinity */ - SPCNST(0, SP_EMAX + 1, 0x3FFFFF), /* + indef quiet Nan */ + SPCNST(0, SP_EMAX + 1, 0x3FFFFF), /* + indef legacy quiet NaN */ + SPCNST(0, SP_EMAX + 1, 0x400000), /* + indef 2008 quiet NaN */ SPCNST(0, SP_EMAX, 0x7FFFFF), /* + max normal */ SPCNST(1, SP_EMAX, 0x7FFFFF), /* - max normal */ SPCNST(0, SP_EMIN, 0x000000), /* + min normal */ Index: linux-sfr-test/arch/mips/math-emu/ieee754.h =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/ieee754.h 2015-09-04 19:19:07.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/ieee754.h 2015-09-04 21:35:56.594791000 +0100 @@ -221,15 +221,16 @@ union ieee754dp ieee754dp_dump(char *s, #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ -#define IEEE754_SPCVAL_INDEF 8 /* quiet NaN */ -#define IEEE754_SPCVAL_PMAX 9 /* +max norm */ -#define IEEE754_SPCVAL_NMAX 10 /* -max norm */ -#define IEEE754_SPCVAL_PMIN 11 /* +min norm */ -#define IEEE754_SPCVAL_NMIN 12 /* -min norm */ -#define IEEE754_SPCVAL_PMIND 13 /* +min denorm */ -#define IEEE754_SPCVAL_NMIND 14 /* -min denorm */ -#define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */ -#define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */ +#define IEEE754_SPCVAL_INDEF_LEG 8 /* legacy quiet NaN */ +#define IEEE754_SPCVAL_INDEF_2008 9 /* IEEE 754-2008 quiet NaN */ +#define IEEE754_SPCVAL_PMAX 10 /* +max norm */ +#define IEEE754_SPCVAL_NMAX 11 /* -max norm */ +#define IEEE754_SPCVAL_PMIN 12 /* +min norm */ +#define IEEE754_SPCVAL_NMIN 13 /* -min norm */ +#define IEEE754_SPCVAL_PMIND 14 /* +min denorm */ +#define IEEE754_SPCVAL_NMIND 15 /* -min denorm */ +#define IEEE754_SPCVAL_P1E31 16 /* + 1.0e31 */ +#define IEEE754_SPCVAL_P1E63 17 /* + 1.0e63 */ extern const union ieee754dp __ieee754dp_spcvals[]; extern const union ieee754sp __ieee754sp_spcvals[]; @@ -243,7 +244,8 @@ extern const union ieee754sp __ieee754sp #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) -#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF]) +#define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ + ieee754_csr.nan2008]) #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) @@ -254,7 +256,8 @@ extern const union ieee754sp __ieee754sp #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) -#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF]) +#define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF_LEG + \ + ieee754_csr.nan2008]) #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) @@ -266,12 +269,25 @@ extern const union ieee754sp __ieee754sp */ static inline int ieee754si_indef(void) { - return INT_MAX; + return ieee754_csr.nan2008 ? 0 : INT_MAX; } static inline s64 ieee754di_indef(void) { - return S64_MAX; + return ieee754_csr.nan2008 ? 0 : S64_MAX; +} + +/* + * Overflow integer value + */ +static inline int ieee754si_overflow(int xs) +{ + return ieee754_csr.nan2008 && xs ? INT_MIN : INT_MAX; +} + +static inline s64 ieee754di_overflow(int xs) +{ + return ieee754_csr.nan2008 && xs ? S64_MIN : S64_MAX; } /* result types for xctx.rt */ Index: linux-sfr-test/arch/mips/math-emu/ieee754dp.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/ieee754dp.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/ieee754dp.c 2015-09-04 21:35:56.597771000 +0100 @@ -37,8 +37,11 @@ static inline int ieee754dp_isnan(union static inline int ieee754dp_issnan(union ieee754dp x) { + int qbit; + assert(ieee754dp_isnan(x)); - return (DPMANT(x) & DP_MBIT(DP_FBITS - 1)) == DP_MBIT(DP_FBITS - 1); + qbit = (DPMANT(x) & DP_MBIT(DP_FBITS - 1)) == DP_MBIT(DP_FBITS - 1); + return ieee754_csr.nan2008 ^ qbit; } @@ -51,7 +54,12 @@ union ieee754dp __cold ieee754dp_nanxcpt assert(ieee754dp_issnan(r)); ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754dp_indef(); + if (ieee754_csr.nan2008) + DPMANT(r) |= DP_MBIT(DP_FBITS - 1); + else + r = ieee754dp_indef(); + + return r; } static u64 ieee754dp_get_rounding(int sn, u64 xm) Index: linux-sfr-test/arch/mips/math-emu/ieee754int.h =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/ieee754int.h 2015-09-04 19:19:07.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/ieee754int.h 2015-09-04 21:35:56.599789000 +0100 @@ -63,10 +63,10 @@ static inline int ieee754_class_nan(int if (ve == SP_EMAX+1+SP_EBIAS) { \ if (vm == 0) \ vc = IEEE754_CLASS_INF; \ - else if (vm & SP_MBIT(SP_FBITS-1)) \ - vc = IEEE754_CLASS_SNAN; \ - else \ + else if (ieee754_csr.nan2008 ^ !(vm & SP_MBIT(SP_FBITS - 1))) \ vc = IEEE754_CLASS_QNAN; \ + else \ + vc = IEEE754_CLASS_SNAN; \ } else if (ve == SP_EMIN-1+SP_EBIAS) { \ if (vm) { \ ve = SP_EMIN; \ @@ -97,10 +97,10 @@ static inline int ieee754_class_nan(int if (ve == DP_EMAX+1+DP_EBIAS) { \ if (vm == 0) \ vc = IEEE754_CLASS_INF; \ - else if (vm & DP_MBIT(DP_FBITS-1)) \ - vc = IEEE754_CLASS_SNAN; \ - else \ + else if (ieee754_csr.nan2008 ^ !(vm & DP_MBIT(DP_FBITS - 1))) \ vc = IEEE754_CLASS_QNAN; \ + else \ + vc = IEEE754_CLASS_SNAN; \ } else if (ve == DP_EMIN-1+DP_EBIAS) { \ if (vm) { \ ve = DP_EMIN; \ Index: linux-sfr-test/arch/mips/math-emu/ieee754sp.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/ieee754sp.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/ieee754sp.c 2015-09-04 21:35:56.602775000 +0100 @@ -37,8 +37,11 @@ static inline int ieee754sp_isnan(union static inline int ieee754sp_issnan(union ieee754sp x) { + int qbit; + assert(ieee754sp_isnan(x)); - return SPMANT(x) & SP_MBIT(SP_FBITS - 1); + qbit = (SPMANT(x) & SP_MBIT(SP_FBITS - 1)) == SP_MBIT(SP_FBITS - 1); + return ieee754_csr.nan2008 ^ qbit; } @@ -51,7 +54,12 @@ union ieee754sp __cold ieee754sp_nanxcpt assert(ieee754sp_issnan(r)); ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754sp_indef(); + if (ieee754_csr.nan2008) + SPMANT(r) |= SP_MBIT(SP_FBITS - 1); + else + r = ieee754sp_indef(); + + return r; } static unsigned ieee754sp_get_rounding(int sn, unsigned xm) Index: linux-sfr-test/arch/mips/math-emu/sp_fdp.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/sp_fdp.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/sp_fdp.c 2015-09-04 21:35:56.604814000 +0100 @@ -44,13 +44,16 @@ union ieee754sp ieee754sp_fdp(union ieee switch (xc) { case IEEE754_CLASS_SNAN: - return ieee754sp_nanxcpt(ieee754sp_nan_fdp(xs, xm)); - + x = ieee754dp_nanxcpt(x); + EXPLODEXDP; + /* Fall through. */ case IEEE754_CLASS_QNAN: y = ieee754sp_nan_fdp(xs, xm); - EXPLODEYSP; - if (!ieee754_class_nan(yc)) - y = ieee754sp_indef(); + if (!ieee754_csr.nan2008) { + EXPLODEYSP; + if (!ieee754_class_nan(yc)) + y = ieee754sp_indef(); + } return y; case IEEE754_CLASS_INF: Index: linux-sfr-test/arch/mips/math-emu/sp_tint.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/sp_tint.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/sp_tint.c 2015-09-04 21:35:56.607763000 +0100 @@ -38,10 +38,13 @@ int ieee754sp_tint(union ieee754sp x) switch (xc) { case IEEE754_CLASS_SNAN: case IEEE754_CLASS_QNAN: - case IEEE754_CLASS_INF: ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754si_indef(); + case IEEE754_CLASS_INF: + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754si_overflow(xs); + case IEEE754_CLASS_ZERO: return 0; @@ -56,7 +59,7 @@ int ieee754sp_tint(union ieee754sp x) /* Set invalid. We will only use overflow for floating point overflow */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754si_indef(); + return ieee754si_overflow(xs); } /* oh gawd */ if (xe > SP_FBITS) { @@ -97,7 +100,7 @@ int ieee754sp_tint(union ieee754sp x) if ((xm >> 31) != 0) { /* This can happen after rounding */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754si_indef(); + return ieee754si_overflow(xs); } if (round || sticky) ieee754_setcx(IEEE754_INEXACT); Index: linux-sfr-test/arch/mips/math-emu/sp_tlong.c =================================================================== --- linux-sfr-test.orig/arch/mips/math-emu/sp_tlong.c 2015-04-08 16:56:50.000000000 +0100 +++ linux-sfr-test/arch/mips/math-emu/sp_tlong.c 2015-09-04 21:35:56.609788000 +0100 @@ -39,10 +39,13 @@ s64 ieee754sp_tlong(union ieee754sp x) switch (xc) { case IEEE754_CLASS_SNAN: case IEEE754_CLASS_QNAN: - case IEEE754_CLASS_INF: ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754di_indef(); + case IEEE754_CLASS_INF: + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754di_overflow(xs); + case IEEE754_CLASS_ZERO: return 0; @@ -57,7 +60,7 @@ s64 ieee754sp_tlong(union ieee754sp x) /* Set invalid. We will only use overflow for floating point overflow */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754di_indef(); + return ieee754di_overflow(xs); } /* oh gawd */ if (xe > SP_FBITS) { @@ -94,7 +97,7 @@ s64 ieee754sp_tlong(union ieee754sp x) if ((xm >> 63) != 0) { /* This can happen after rounding */ ieee754_setcx(IEEE754_INVALID_OPERATION); - return ieee754di_indef(); + return ieee754di_overflow(xs); } if (round || sticky) ieee754_setcx(IEEE754_INEXACT); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/