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Diffstat (limited to 'test/double2.awk')
| -rw-r--r-- | test/double2.awk | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/test/double2.awk b/test/double2.awk new file mode 100644 index 00000000..e826eeca --- /dev/null +++ b/test/double2.awk @@ -0,0 +1,46 @@ +# Date: Mon, 19 Dec 2005 18:14:13 -0800 +# From: David Ellsworth <ellswort@nas.nasa.gov> +# Subject: Re: gawk number to string bug +# To: eggert@CS.UCLA.EDU, eliz@gnu.org +# Cc: arnold@skeeve.com, aschorr@telemetry-investments.com, +# bug-gnu-utils@gnu.org, ellswort@nas.nasa.gov +# Message-id: <200512200214.jBK2EDuu020216@ece03.nas.nasa.gov> +# +# Since you are taking my bug report seriously (which is really great), +# let me add some more fuel to the fire. Consider this program: +# +# BEGIN { x=2**60; for(i=60;i<=65;i++) { printf "2^%d= %s %d %g\n",i,x,x,x; x*=2}} +# +# which prints out powers of two around 2^63. On an Opteron (as well as +# an Itanium), you get +# +# 2^60= 1152921504606846976 1152921504606846976 1.15292e+18 +# 2^61= 2305843009213693952 2305843009213693952 2.30584e+18 +# 2^62= 4611686018427387904 4611686018427387904 4.61169e+18 +# 2^63= -9223372036854775808 9223372036854775808 9.22337e+18 +# 2^64= 1.84467e+19 0 1.84467e+19 +# 2^65= 3.68935e+19 3.68935e+19 3.68935e+19 +# +# On a Xeon, you get +# +# 2^60= 1.15292e+18 1152921504606846976 1.15292e+18 +# 2^61= 2.30584e+18 2305843009213693952 2.30584e+18 +# 2^62= 4.61169e+18 4611686018427387904 4.61169e+18 +# 2^63= 9.22337e+18 9223372036854775808 9.22337e+18 +# 2^64= 1.84467e+19 0 1.84467e+19 +# 2^65= 3.68935e+19 3.68935e+19 3.68935e+19 +# +# The 2^64 value for %d is probably also a bug since the outputs +# for 2^63 and 2^65 are reasonable. +# +# - David +# + +BEGIN { + x = 2 ^ 60 +# for (i = 60; i <= 65; i++) { + for (i = 60; i <= 63; i++) { + printf "2^%d= %s %d %g %o\n", i, x, x, x, x + x *= 2 + } +} |