diff options
| author |  xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2013-07-29 12:10:11 +0000 |
|---|---|---|
| committer | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2013-07-29 12:10:11 +0000 |
| commit | 41b7ecb127b93b1aecc29a298ec21dc94603e6fa (patch) | |
| tree | 287ce1cbf88caf973534715c7816d57b9089b265 /ia32/Asmgenproof1.v | |
| parent | 4bf8b331372388dc9cb39154c986c918df9e071c (diff) | |
Optimize integer divisions by positive constants, turning them into
multiply-high and shifts.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2300 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'ia32/Asmgenproof1.v')
| -rw-r--r-- | ia32/Asmgenproof1.v | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/ia32/Asmgenproof1.v b/ia32/Asmgenproof1.v index 728617e..9ddc463 100644 --- a/ia32/Asmgenproof1.v +++ b/ia32/Asmgenproof1.v @@ -922,6 +922,10 @@ Transparent destroyed_by_op. apply SAME. eapply mk_intconv_correct; eauto. (* cast16unsigned *) apply SAME. eapply mk_intconv_correct; eauto. +(* mulhs *) + apply SAME. TranslOp. destruct H1. Simplifs. +(* mulhu *) + apply SAME. TranslOp. destruct H1. Simplifs. (* div *) apply SAME. specialize (divs_mods_exist (rs EAX) (rs ECX)). rewrite H0. |