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authorAleksandar Markovic <aleksandar.markovic@imgtec.com>2016-06-10 11:57:31 +0200
committerLeon Alrae <leon.alrae@imgtec.com>2016-06-24 13:41:32 +0100
commitc27644f0e9659471e1c9355da5b667960d311937 (patch)
tree2215e22acdc05f7f55cef3f387b5daa986214a98 /fpu
parenta7c04d545a97126c9df9d96623747d8613aaf7db (diff)
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softfloat: Handle snan_bit_is_one == 0 in MIPS pickNaNMulAdd()
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 [1], page 53, section "3.5.3 NaN Propagation". [1] "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 <aleksandar.markovic@imgtec.com> Reviewed-by: Leon Alrae <leon.alrae@imgtec.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [leon.alrae@imgtec.com: * reworded the subject of the patch * swapped if/else code blocks to match the commit description] Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Diffstat (limited to 'fpu')
-rw-r--r--fpu/softfloat-specialize.h41
1 files changed, 29 insertions, 12 deletions
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index a1bcb46..43d0890 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -571,19 +571,36 @@ static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
return 3;
}
- /* 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;
+ 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 2;
+ /* 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)