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Diffstat (limited to 'runtime/ia32/i64_ucmp.S')
| -rw-r--r-- | runtime/ia32/i64_ucmp.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/runtime/ia32/i64_ucmp.S b/runtime/ia32/i64_ucmp.S new file mode 100644 index 0000000..3415986 --- /dev/null +++ b/runtime/ia32/i64_ucmp.S @@ -0,0 +1,52 @@ +// ***************************************************************** +// +// 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" + +// Unsigned comparison + +FUNCTION(__i64_ucmp) + movl 8(%esp), %eax // compare high words + cmpl 16(%esp), %eax + jne 1f // if high words equal, + movl 4(%esp), %eax // compare low words + cmpl 12(%esp), %eax +1: seta %al // AL = 1 if >, 0 if <= + setb %dl // DL = 1 if <, 0 if >= + subb %dl, %al // AL = 0 if same, 1 if >, -1 if < + movsbl %al, %eax + ret +ENDFUNCTION(__i64_ucmp) |