pow(3): Workaround possible signed shift Undefined Behavior.
j is int32_t and thus j<<31 is undefined if j==1. Hinted by: muusl-lib (git 688d3da0f1730daddbc954bbc2d27cc96ceee04c) Discussed with: freebsd-numerics (kargl)
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=342851
@ -133,7 +133,7 @@ __ieee754_pow(double x, double y)
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k = (iy>>20)-0x3ff; /* exponent */
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if(k>20) {
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j = ly>>(52-k);
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if((j<<(52-k))==ly) yisint = 2-(j&1);
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if(((u_int32_t)j<<(52-k))==ly) yisint = 2-(j&1);
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} else if(ly==0) {
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j = iy>>(20-k);
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if((j<<(20-k))==iy) yisint = 2-(j&1);
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