diff options
Diffstat (limited to 'runtime/ia32/i64_scmp.S')
| -rw-r--r-- | runtime/ia32/i64_scmp.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/runtime/ia32/i64_scmp.S b/runtime/ia32/i64_scmp.S new file mode 100644 index 0000000..93ef2c2 --- /dev/null +++ b/runtime/ia32/i64_scmp.S @@ -0,0 +1,58 @@ +// ***************************************************************** +// +// The Compcert verified compiler +// +// Xavier Leroy, INRIA Paris-Rocquencourt +// +// Copyright (c) 2013 Institut National de Recherche en Informatique et +// en Automatique. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are met: +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// * Neither the name of the <organization> nor the +// names of its contributors may be used to endorse or promote products +// derived from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT +// HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, +// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// ********************************************************************* + +// Helper functions for 64-bit integer arithmetic. IA32 version. + +#include "sysdeps.h" + +// Signed comparison + +FUNCTION(__i64_scmp) + movl 8(%esp), %eax // compare high words (signed) + cmpl 16(%esp), %eax + je 1f // if different, + setg %al // extract result + setl %dl + subb %dl, %al + movsbl %al, %eax + ret +1: movl 4(%esp), %eax // if high words equal, + cmpl 12(%esp), %eax // compare low words (unsigned) + seta %al // and extract result + setb %dl + subb %dl, %al + movsbl %al, %eax + ret +ENDFUNCTION(__i64_scmp) + |