Patch "MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite signs" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite signs

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mips-math-emu-maxa-mina-.-d-s-fix-cases-of-input-values-with-opposite-signs.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Aleksandar Markovic <[email protected]>
Date: Thu, 27 Jul 2017 18:08:51 +0200
Subject: MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite signs

From: Aleksandar Markovic <[email protected]>

commit 1a41b3b441508ae63b1a9ec699ec94065739eb60 upstream.

Fix the value returned by <MAXA|MINA>.<D|S>, if the inputs are normal fp numbers of the same absolute value, but opposite signs.

A relevant example:

MAXA.S fd,fs,ft:
If fs contains -3.0, and ft contains +3.0, fd is going to contain +3.0 (without this patch, it used to contain -3.0).

Patchwork: https://patchwork.linux-mips.org/patch/16883/

---
 arch/mips/math-emu/dp_fmax.c |    8 ++++++--
 arch/mips/math-emu/dp_fmin.c |    6 +++++-
 arch/mips/math-emu/sp_fmax.c |    8 ++++++--
 arch/mips/math-emu/sp_fmin.c |    6 +++++-
 4 files changed, 22 insertions(+), 6 deletions(-)

@@ -243,7 +243,11 @@ union ieee754dp ieee754dp_fmaxa(union ie
 		return y;
 
 	/* Compare mantissa */
-	if (xm <= ym)
+	if (xm < ym)
 		return y;
-	return x;
+	else if (xm > ym)
+		return x;
+	else if (xs == 0)
+		return x;
+	return y;
 }

@@ -243,7 +243,11 @@ union ieee754dp ieee754dp_fmina(union ie
 		return x;
 
 	/* Compare mantissa */
-	if (xm <= ym)
+	if (xm < ym)
+		return x;
+	else if (xm > ym)
+		return y;
+	else if (xs == 1)
 		return x;
 	return y;
 }

@@ -243,7 +243,11 @@ union ieee754sp ieee754sp_fmaxa(union ie
 		return y;
 
 	/* Compare mantissa */
-	if (xm <= ym)
+	if (xm < ym)
 		return y;
-	return x;
+	else if (xm > ym)
+		return x;
+	else if (xs == 0)
+		return x;
+	return y;
 }

@@ -243,7 +243,11 @@ union ieee754sp ieee754sp_fmina(union ie
 		return x;
 
 	/* Compare mantissa */
-	if (xm <= ym)
+	if (xm < ym)
+		return x;
+	else if (xm > ym)
+		return y;
+	else if (xs == 1)
 		return x;
 	return y;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/mips-math-emu-maddf-msubf-.-d-s-fix-nan-propagation.patch queue-4.9/mips-math-emu-max-maxa-min-mina-.-d-s-fix-cases-of-both-inputs-zero.patch queue-4.9/mips-math-emu-handle-zero-accumulator-case-in-maddf-and-msubf-separately.patch queue-4.9/mips-math-emu-max-min-.-d-s-fix-cases-of-both-inputs-negative.patch queue-4.9/mips-math-emu-max-maxa-min-mina-.-d-s-fix-quiet-nan-propagation.patch queue-4.9/mips-math-emu-maddf-msubf-.d-fix-accuracy-64-bit-case.patch queue-4.9/mips-math-emu-maddf-msubf-.s-fix-accuracy-32-bit-case.patch queue-4.9/mips-math-emu-maxa-mina-.-d-s-fix-cases-of-input-values-with-opposite-signs.patch queue-4.9/mips-math-emu-maxa-mina-.-d-s-fix-cases-of-both-infinite-inputs.patch queue-4.9/mips-math-emu-mina.-d-s-fix-some-cases-of-infinity-and-zero-inputs.patch queue-4.9/mips-math-emu-maddf-msubf-.-d-s-fix-some-cases-of-zero-inputs.patch queue-4.9/mips-math-emu-maddf-msubf-.-d-s-clean-up-maddf_flags-enumeration.patch queue-4.9/mips-math-emu-maddf-msubf-.-d-s-fix-some-cases-of-infinite-inputs.patch