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cmd/gc: fix undefined behaviour warnings in mparith3.c

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Update #8527

Fixes two warnings:

src/cmd/gc/mparith3.c:255:10: runtime error: shift exponent 52 is too large for 32-bit type 'int'
src/cmd/gc/mparith3.c:254:14: runtime error: shift exponent 52 is too large for 32-bit type 'int'

LGTM=rsc
R=r, dvyukov, rsc
CC=golang-codereviews
https://golang.org/cl/134940044
This commit is contained in:
Dave Cheney 2014-08-27 15:23:38 +10:00
parent 1660ece769
commit 9c504696f4
1 changed files with 2 additions and 2 deletions
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4
src/cmd/gc/mparith3.c
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@ -251,8 +251,8 @@ mpgetfltN(Mpflt *a, int prec, int bias)
s = minexp - e; s = minexp - e;
if(s > prec+1) if(s > prec+1)
s = prec+1; s = prec+1;
if((v & ((1<<s)-1)) != 0) if((v & ((1ULL<<s)-1)) != 0)
v |= 1<<s; v |= 1ULL<<s;
v >>= s; v >>= s;
e = minexp; e = minexp;
} }