fix #8968: abs(big(-0.0))

backport of a42a54b
JuliaLang · Nov 18, 2014 · 8425d55 · 8425d55
1 parent ea4f2c9
commit 8425d55
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diff --git a/base/number.jl b/base/number.jl
@@ -21,7 +21,7 @@ last(x::Number) = x
 divrem(x,y) = (div(x,y),rem(x,y))
 signbit(x::Real) = x < 0
 sign(x::Real) = ifelse(x < 0, oftype(x,-1), ifelse(x > 0, one(x), x))
-abs(x::Real) = ifelse(x < 0, -x, x)
+abs(x::Real) = ifelse(signbit(x), -x, x)
 abs2(x::Real) = x*x
 copysign(x::Real, y::Real) = ifelse(signbit(x)!=signbit(y), -x, x)
 

diff --git a/test/numbers.jl b/test/numbers.jl
@@ -1827,3 +1827,6 @@ ndigf(n) = float64(log(float32(n)))
 # issue #7911
 @test sum([int128(1) int128(2)]) == int128(3)
 
+let x = big(-0.0)
+    @test signbit(x) && !signbit(abs(x))
+end