From: Peter Steinfeld <psteinfeld@nvidia.com>
Date: Thu, 7 Jul 2022 17:42:47 +0000 (-0700)
Subject: [flang] SET_EXPONENT(-0.0) should return -0.0
X-Git-Tag: upstream/15.0.7~2389
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9f9e9d9cfc2e2f929c17de4a1065c0eb68e479c0;p=platform%2Fupstream%2Fllvm.git

[flang] SET_EXPONENT(-0.0) should return -0.0

Section 16.9.171 says:

If X has the value zero, the result has the same value as X

So if X is -0.0, SET_EXPONENT should return -0.0.

Differential Revision: https://reviews.llvm.org/D129309
---

diff --git a/flang/runtime/numeric.cpp b/flang/runtime/numeric.cpp
index 8d02973..a989d3a 100644
--- a/flang/runtime/numeric.cpp
+++ b/flang/runtime/numeric.cpp
@@ -122,7 +122,7 @@ template <typename T> inline T SetExponent(T x, std::int64_t p) {
   } else if (std::isinf(x)) {
     return std::numeric_limits<T>::quiet_NaN(); // +/-Inf -> NaN
   } else if (x == 0) {
-    return 0; // 0 -> 0
+    return x; // return negative zero if x is negative zero
   } else {
     int expo{std::ilogb(x) + 1};
     auto ip{static_cast<int>(p - expo)};