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Commit ddbfff74 authored by Aleksandar Markovic's avatar Aleksandar Markovic Committed by Ralf Baechle
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MIPS: math-emu: Handle zero accumulator case in MADDF and MSUBF separately 



If accumulator value is zero, just return the value of previously
calculated product. This brings logic in MADDF/MSUBF implementation
closer to the logic in ADD/SUB case.

Signed-off-by: default avatarMiodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: default avatarGoran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: default avatarAleksandar Markovic <aleksandar.markovic@imgtec.com>
Cc: James.Hogan@imgtec.com
Cc: Paul.Burton@imgtec.com
Cc: Raghu.Gandham@imgtec.com
Cc: Leonid.Yegoshin@imgtec.com
Cc: Douglas.Leung@imgtec.com
Cc: Petar.Jovanovic@imgtec.com
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16512/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 25d8b92e

arch/mips/math-emu/dp_maddf.c

+4 −1
Original line number Diff line number Diff line
@@ -54,7 +54,7 @@ static union ieee754dp _dp_maddf(union ieee754dp z, union ieee754dp x, 
		return ieee754dp_nanxcpt(z);

	case IEEE754_CLASS_DNORM:

		DPDNORMZ;

	/* QNAN is handled separately below */

	/* QNAN and ZERO cases are handled separately below */

	}



	switch (CLPAIR(xc, yc)) {
@@ -210,6 +210,9 @@ static union ieee754dp _dp_maddf(union ieee754dp z, union ieee754dp x, 
	}

	assert(rm & (DP_HIDDEN_BIT << 3));



	if (zc == IEEE754_CLASS_ZERO)

		return ieee754dp_format(rs, re, rm);



	/* And now the addition */

	assert(zm & DP_HIDDEN_BIT);

arch/mips/math-emu/sp_maddf.c

+4 −1
Original line number Diff line number Diff line
@@ -54,7 +54,7 @@ static union ieee754sp _sp_maddf(union ieee754sp z, union ieee754sp x, 
		return ieee754sp_nanxcpt(z);

	case IEEE754_CLASS_DNORM:

		SPDNORMZ;

	/* QNAN is handled separately below */

	/* QNAN and ZERO cases are handled separately below */

	}



	switch (CLPAIR(xc, yc)) {
@@ -203,6 +203,9 @@ static union ieee754sp _sp_maddf(union ieee754sp z, union ieee754sp x, 
	}

	assert(rm & (SP_HIDDEN_BIT << 3));



	if (zc == IEEE754_CLASS_ZERO)

		return ieee754sp_format(rs, re, rm);



	/* And now the addition */



	assert(zm & SP_HIDDEN_BIT);