From: Nicholas Clark Date: Wed, 8 Nov 2000 15:14:12 +0000 (+0000) Subject: More careful detection of how well NVs and UVs mix. X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=1d1be0dc9f802e3078e792e542410cceb4d24b89;p=p5sagit%2Fp5-mst-13.2.git More careful detection of how well NVs and UVs mix. Subject: [PATCH] Re: NV preserving UV (wasRe: [ID 20001007.002] Not OK: perl v5.7.0 +DEVEL7158 on armv4l-linux-64int 2.2.17-rmk1 (UNINSTALLED)) Message-ID: <20001108151412.B98736@plum.flirble.org> Added some SIGFPE paranoia. p4raw-id: //depot/perl@7605 --- diff --git a/Configure b/Configure index 10e203b..474663b 100755 --- a/Configure +++ b/Configure @@ -20,7 +20,7 @@ # $Id: Head.U,v 3.0.1.9 1997/02/28 15:02:09 ram Exp $ # -# Generated on Wed Nov 8 01:38:53 EET 2000 [metaconfig 3.0 PL70] +# Generated on Wed Nov 8 18:33:32 EET 2000 [metaconfig 3.0 PL70] # (with additional metaconfig patches by perlbug@perl.org) cat >/tmp/c1$$ <&4 +$cat >try.c <<'EOCP' +int main() +{ + typedef struct _goo_struct goo_struct; + goo_struct * volatile goo = ((goo_struct *)0); + struct _goo_struct { + long long_int; + int reg_int; + char char_var; + }; + typedef unsigned short foo_t; + char *volatile foo; + volatile int bar; + volatile foo_t blech; + foo = foo; +} +EOCP +if $cc -c $ccflags try.c >/dev/null 2>&1 ; then + val="$define" + echo "Yup, it does." +else + val="$undef" + echo "Nope, it doesn't." +fi +set d_volatile +eval $setvar +$rm -f try.* + echo " " $echo "Choosing the C types to be used for Perl's internal types..." >&4 @@ -10274,67 +10305,68 @@ case "$i64type" in ;; esac -$echo "Checking whether your NVs can preserve your UVs..." >&4 +$echo "Checking how many bits of your UVs your NVs can preserve..." >&4 +: volatile so that the compiler has to store it out to memory. +if test X"$d_volatile" = X"$define"; then + volatile=volatile +fi $cat <try.c #include -int main() { - $uvtype k = ($uvtype)~0, l; - $nvtype d; - l = k; - d = ($nvtype)l; - l = ($uvtype)d; - if (l == k) - printf("preserve\n"); - exit(0); -} -EOP -set try -if eval $compile; then - case "`./try$exe_ext`" in - preserve) d_nv_preserves_uv="$define" ;; - esac -fi -case "$d_nv_preserves_uv" in -$define) $echo "Yes, they can." 2>&1 ;; -*) $echo "No, they can't." 2>&1 - d_nv_preserves_uv="$undef" - ;; -esac - -$rm -f try.* try - -case "$d_nv_preserves_uv" in -"$define") d_nv_preserves_uv_bits=`expr $uvsize \* 8` ;; -*) $echo "Checking how many bits of your UVs your NVs can preserve..." >&4 - $cat <try.c -#include +#include +#include +#ifdef SIGFPE +$volatile int bletched = 0; +$signal_t blech(s) int s; { bletched = 1; } +#endif int main() { $uvtype u = 0; + $nvtype d; int n = 8 * $uvsize; int i; +#ifdef SIGFPE + signal(SIGFPE, blech); +#endif + for (i = 0; i < n; i++) { u = u << 1 | ($uvtype)1; - if (($uvtype)($nvtype)u != u) + d = ($nvtype)u; + if (($uvtype)d != u) break; + if (d <= 0) + break; + d = ($nvtype)(u - 1); + if (($uvtype)d != (u - 1)) + break; +#ifdef SIGFPE + if (bletched) { + break; +#endif + } } - printf("%d\n", i); + printf("%d\n", ((i == n) ? -n : i), u); exit(0); } EOP - set try - if eval $compile; then - d_nv_preserves_uv_bits="`./try$exe_ext`" - fi - case "$d_nv_preserves_uv_bits" in - [1-9]*) $echo "Your NVs can preserve $d_nv_preserves_uv_bits bits of your UVs." 2>&1 ;; - *) $echo "Can't figure out how many bits your NVs preserve." 2>&1 - d_nv_preserves_uv_bits="$undef" - ;; - esac - $rm -f try.* try +set try + +d_nv_preserves_uv="$undef" +if eval $compile; then + d_nv_preserves_uv_bits="`./try$exe_ext`" +fi +case "$d_nv_preserves_uv_bits" in +\-[1-9]*) + d_nv_preserves_uv_bits=`expr 0 - $d_nv_preserves_uv_bits` + $echo "Your NVs can preserve all $d_nv_preserves_uv_bits bits of your UVs." 2>&1 + d_nv_preserves_uv="$define" ;; +[1-9]*) $echo "Your NVs can preserve only $d_nv_preserves_uv_bits bits of your UVs." 2>&1 + d_nv_preserves_uv="$undef" ;; +*) $echo "Can't figure out how many bits your NVs preserve." 2>&1 + d_nv_preserves_uv_bits="$undef" ;; esac +$rm -f try.* try + : check for off64_t echo " " @@ -12077,37 +12109,6 @@ esac set d_void_closedir eval $setvar $rm -f closedir* -: check for volatile keyword -echo " " -echo 'Checking to see if your C compiler knows about "volatile"...' >&4 -$cat >try.c <<'EOCP' -int main() -{ - typedef struct _goo_struct goo_struct; - goo_struct * volatile goo = ((goo_struct *)0); - struct _goo_struct { - long long_int; - int reg_int; - char char_var; - }; - typedef unsigned short foo_t; - char *volatile foo; - volatile int bar; - volatile foo_t blech; - foo = foo; -} -EOCP -if $cc -c $ccflags try.c >/dev/null 2>&1 ; then - val="$define" - echo "Yup, it does." -else - val="$undef" - echo "Nope, it doesn't." -fi -set d_volatile -eval $setvar -$rm -f try.* - : see if there is a wait4 set wait4 d_wait4 eval $inlibc