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6c285ba88a
fmt::format("{:a}", 0.0) produced 0x0p-1022 where printf's %a gives
0x0p+0, and likewise for -0.0, {:A}, {:#a} and any explicit precision.
basic_fp::assign maps a zero biased exponent to 1 ("subnormals use
biased exponent 1"), which is right for subnormals but not for zero, so
format_hexfloat inherited the minimum subnormal exponent for a value
whose significand carries no information. Reset the exponent there
rather than in assign, which the decimal path shares.
A zero significand can only come from +-0: normals get the implicit bit
added, and a subnormal has a nonzero significand by definition. So the
guard cannot affect anything else, and denorm_min keeps its existing
denormalized form (0x0.0000000000001p-1022, asserted in format_double).
The five new expectations were taken from printf rather than derived,
and all fail without this change.
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| .. | ||
| add-subdirectory-test | ||
| compile-error-test | ||
| cuda-test | ||
| find-package-test | ||
| fuzzing | ||
| gtest | ||
| static-export-test | ||
| args-test.cc | ||
| assert-test.cc | ||
| base-test.cc | ||
| c-test.c | ||
| chrono-test.cc | ||
| CMakeLists.txt | ||
| color-test.cc | ||
| compile-test.cc | ||
| detect-stdfs.cc | ||
| enforce-checks-test.cc | ||
| format-impl-test.cc | ||
| format-test.cc | ||
| gtest-extra-test.cc | ||
| gtest-extra.cc | ||
| gtest-extra.h | ||
| header-only-test.cc | ||
| mock-allocator.h | ||
| module-test.cc | ||
| no-builtin-types-test.cc | ||
| noexception-test.cc | ||
| os-test.cc | ||
| ostream-test.cc | ||
| perf-sanity.cc | ||
| posix-mock-test.cc | ||
| posix-mock.h | ||
| printf-test.cc | ||
| ranges-odr-test.cc | ||
| ranges-test.cc | ||
| scan-test.cc | ||
| scan.h | ||
| std-test.cc | ||
| test-assert.h | ||
| test-main.cc | ||
| unicode-test.cc | ||
| util.cc | ||
| util.h | ||
| xchar-test.cc | ||