diff options
Diffstat (limited to 'test/474-fp-sub-neg')
| -rw-r--r-- | test/474-fp-sub-neg/expected.txt | 4 | ||||
| -rw-r--r-- | test/474-fp-sub-neg/info.txt | 6 | ||||
| -rw-r--r-- | test/474-fp-sub-neg/src/Main.java | 4 |
3 files changed, 14 insertions, 0 deletions
diff --git a/test/474-fp-sub-neg/expected.txt b/test/474-fp-sub-neg/expected.txt index e6ffe0d..1c15abb 100644 --- a/test/474-fp-sub-neg/expected.txt +++ b/test/474-fp-sub-neg/expected.txt @@ -1,2 +1,6 @@ -0.0 +0.0 +0.0 -0.0 +0.0 +0.0 diff --git a/test/474-fp-sub-neg/info.txt b/test/474-fp-sub-neg/info.txt index eced93f..82effdb 100644 --- a/test/474-fp-sub-neg/info.txt +++ b/test/474-fp-sub-neg/info.txt @@ -1,5 +1,11 @@ Regression check for optimizing simplify instruction pass. + A pair (sub, neg) should not be transforemd to (sub) for fp calculation because we can lose the sign of zero for the following expression: - ( A - B ) != B - A ; if B == A + +Addition or subtraction with fp zero should not be eliminated +because: + -0.0 + 0.0 = 0.0 + -0.0 - -0.0 = 0.0 diff --git a/test/474-fp-sub-neg/src/Main.java b/test/474-fp-sub-neg/src/Main.java index e6bce67..c190e8e 100644 --- a/test/474-fp-sub-neg/src/Main.java +++ b/test/474-fp-sub-neg/src/Main.java @@ -24,6 +24,8 @@ public class Main { } System.out.println(f); + System.out.println(f + 0f); + System.out.println(f - (-0f)); } public static void doubleTest() { @@ -35,6 +37,8 @@ public class Main { } System.out.println(d); + System.out.println(d + 0f); + System.out.println(d - (-0f)); } public static void main(String[] args) { |