[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v3 3/6] softfloat: For Mips only, correct order in p
From: |
Aleksandar Markovic |
Subject: |
[Qemu-devel] [PATCH v3 3/6] softfloat: For Mips only, correct order in pickNaNMulAdd() |
Date: |
Mon, 11 Apr 2016 20:15:27 +0200 |
From: Aleksandar Markovic <address@hidden>
Only for Mips platform, and only for cases when snan_bit_is_one is 0,
correct the order of argument comparisons in pickNaNMulAdd().
For more info, see [2], page 53, section "3.5.3 NaN Propagation".
[1] "MIPS® Architecture For Programmers Volume II-A:
The MIPS64® Instruction Set Reference Manual",
Imagination Technologies LTD, Revision 6.04, November 13, 2015
[2] "MIPS Architecture for Programmers Volume IV-j:
The MIPS32® SIMD Architecture Module",
Imagination Technologies LTD, Revision 1.12, February 3, 2016
Signed-off-by: Aleksandar Markovic <address@hidden>
---
fpu/softfloat-specialize.h | 41 +++++++++++++++++++++++++++++------------
1 file changed, 29 insertions(+), 12 deletions(-)
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index 169246e..807ecc0 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -569,19 +569,36 @@ static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
return 3;
}
- /* Prefer sNaN over qNaN, in the c, a, b order. */
- if (cIsSNaN) {
- return 2;
- } else if (aIsSNaN) {
- return 0;
- } else if (bIsSNaN) {
- return 1;
- } else if (cIsQNaN) {
- return 2;
- } else if (aIsQNaN) {
- return 0;
+ if (status->snan_bit_is_one) {
+ /* Prefer sNaN over qNaN, in the a, b, c order. */
+ if (aIsSNaN) {
+ return 0;
+ } else if (bIsSNaN) {
+ return 1;
+ } else if (cIsSNaN) {
+ return 2;
+ } else if (aIsQNaN) {
+ return 0;
+ } else if (bIsQNaN) {
+ return 1;
+ } else {
+ return 2;
+ }
} else {
- return 1;
+ /* Prefer sNaN over qNaN, in the c, a, b order. */
+ if (cIsSNaN) {
+ return 2;
+ } else if (aIsSNaN) {
+ return 0;
+ } else if (bIsSNaN) {
+ return 1;
+ } else if (cIsQNaN) {
+ return 2;
+ } else if (aIsQNaN) {
+ return 0;
+ } else {
+ return 1;
+ }
}
}
#elif defined(TARGET_PPC)
--
1.7.9.5
- [Qemu-devel] [PATCH v3 0/6] target-mips: Initiate IEEE 754-2008 support, Aleksandar Markovic, 2016/04/11
- [Qemu-devel] [PATCH v3 4/6] target-mips: Activate IEEE 274-2008 support, Aleksandar Markovic, 2016/04/11
- [Qemu-devel] [PATCH v3 3/6] softfloat: For Mips only, correct order in pickNaNMulAdd(),
Aleksandar Markovic <=
- [Qemu-devel] [PATCH v3 2/6] softfloat: For Mips only, correct default NaN values, Aleksandar Markovic, 2016/04/11
- [Qemu-devel] [PATCH v3 6/6] target-mips: Add nan2008 flavor of <CEIL|CVT|FLOOR|ROUND|TRUNC>.<L|W>.<S|D>, Aleksandar Markovic, 2016/04/11
- [Qemu-devel] [PATCH v3 5/6] target-mips: Add abs2008 flavor of <ABS|NEG>.<S|D>, Aleksandar Markovic, 2016/04/11
- [Qemu-devel] [PATCH v3 1/6] softfloat: Implement run-time-configurable meaning of signaling NaN bit, Aleksandar Markovic, 2016/04/11