vasilito
068a1ca63e
Bootloader fork rebase:
- Base changed from 0.1.0 pre-patched archive to upstream 1.0.0 tag (c7eeb9f)
- Applied 0001-redbear-local-forks.patch (Cargo.toml crate path redirects)
- Applied fix-uefi-alloc-panic.patch equivalents (4 panic!() -> graceful
error handling in src/main.rs)
- Applied P5-live-preload-cap-1gib.patch (1 GiB cap on live image preload)
- Skipped: P0 GPT partition scan (requires new module + integration),
P1 timeout/default-resolution, P2 live preload guard (subsumed by
panic fixes + cap), P3 live image safe read, P4 large ISO boot,
redox.patch — to be applied in dedicated rebase session.
firmware-loader/Cargo.toml: version 0.1.0 -> 0.3.0 (sync with other
Red Bear custom crates which are at 0.3.0).
fork-upstream-map.toml: bootloader back from PENDING_REBASE to 1.0.0
since the partial rebase matches upstream 1.0.0 content.
fork-upstream-map.toml: base restored to 'main' tracked (was correctly
tracked by build-redbear.sh).
116 lines
3.7 KiB
Plaintext
116 lines
3.7 KiB
Plaintext
# exponentl.m4
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# serial 7
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dnl Copyright (C) 2007-2025 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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AC_DEFUN_ONCE([gl_LONG_DOUBLE_EXPONENT_LOCATION],
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[
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AC_REQUIRE([gl_BIGENDIAN])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([where to find the exponent in a 'long double'],
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[gl_cv_cc_long_double_expbit0],
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[
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <float.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#define NWORDS \
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((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
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typedef union { long double value; unsigned int word[NWORDS]; }
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memory_long_double;
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static unsigned int ored_words[NWORDS];
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static unsigned int anded_words[NWORDS];
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static void add_to_ored_words (long double *x)
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{
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memory_long_double m;
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size_t i;
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/* Clear it first, in case
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sizeof (long double) < sizeof (memory_long_double). */
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memset (&m, 0, sizeof (memory_long_double));
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m.value = *x;
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for (i = 0; i < NWORDS; i++)
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{
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ored_words[i] |= m.word[i];
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anded_words[i] &= m.word[i];
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}
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}
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int main ()
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{
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static long double samples[5] = { 0.25L, 0.5L, 1.0L, 2.0L, 4.0L };
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size_t j;
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FILE *fp = fopen ("conftest.out", "w");
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if (fp == NULL)
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return 1;
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for (j = 0; j < NWORDS; j++)
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anded_words[j] = ~ (unsigned int) 0;
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for (j = 0; j < 5; j++)
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add_to_ored_words (&samples[j]);
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/* Remove bits that are common (e.g. if representation of the first mantissa
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bit is explicit). */
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for (j = 0; j < NWORDS; j++)
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ored_words[j] &= ~anded_words[j];
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/* Now find the nonzero word. */
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for (j = 0; j < NWORDS; j++)
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if (ored_words[j] != 0)
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break;
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if (j < NWORDS)
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{
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size_t i;
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for (i = j + 1; i < NWORDS; i++)
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if (ored_words[i] != 0)
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{
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fprintf (fp, "unknown");
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return (fclose (fp) != 0);
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}
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for (i = 0; ; i++)
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if ((ored_words[j] >> i) & 1)
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{
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fprintf (fp, "word %d bit %d", (int) j, (int) i);
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return (fclose (fp) != 0);
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}
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}
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fprintf (fp, "unknown");
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return (fclose (fp) != 0);
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}
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]])],
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[gl_cv_cc_long_double_expbit0=`cat conftest.out`],
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[gl_cv_cc_long_double_expbit0="unknown"],
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[
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dnl When cross-compiling, in general we don't know. It depends on the
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dnl ABI and compiler version. There are too many cases.
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gl_cv_cc_long_double_expbit0="unknown"
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case "$host_os" in
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mingw* | windows*)
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# On native Windows (little-endian), we know the result
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# in two cases: mingw, MSVC.
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AC_EGREP_CPP([Known], [
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#ifdef __MINGW32__
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Known
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#endif
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], [gl_cv_cc_long_double_expbit0="word 2 bit 0"])
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AC_EGREP_CPP([Known], [
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#ifdef _MSC_VER
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Known
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#endif
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], [gl_cv_cc_long_double_expbit0="word 1 bit 20"])
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;;
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esac
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])
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rm -f conftest.out
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])
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case "$gl_cv_cc_long_double_expbit0" in
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word*bit*)
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word=`echo "$gl_cv_cc_long_double_expbit0" | sed -e 's/word //' -e 's/ bit.*//'`
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bit=`echo "$gl_cv_cc_long_double_expbit0" | sed -e 's/word.*bit //'`
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AC_DEFINE_UNQUOTED([LDBL_EXPBIT0_WORD], [$word],
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[Define as the word index where to find the exponent of 'long double'.])
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AC_DEFINE_UNQUOTED([LDBL_EXPBIT0_BIT], [$bit],
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[Define as the bit index in the word where to find bit 0 of the exponent of 'long double'.])
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;;
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esac
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])
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