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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2016-10-04 15:52:16 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavier.leroy@inria.fr> | 2016-10-04 15:52:16 +0200 |
| commit | d2af79a77ed2936ff0ed90cadf8e48637d774d4c (patch) | |
| tree | 09300943e12a98ae80598c79d455b31725271ead /cfrontend/C2C.ml | |
| parent | a44893028eb1dd434c68001234ad56d030205a8e (diff) | |
| download | compcert-kvx-d2af79a77ed2936ff0ed90cadf8e48637d774d4c.tar.gz compcert-kvx-d2af79a77ed2936ff0ed90cadf8e48637d774d4c.zip | |
Turn 64-bit integer division and modulus by constants into multiply-high
This trick was already implemented for 32-bit integer division and modulus. Here we extend it to the 64-bit case.
For 32-bit target processors, the runtime library must implement 64-bit multiply-high (signed and unsigned). Tentative implementations are provided for IA32 and PowerPC, but need testing.
Diffstat (limited to 'cfrontend/C2C.ml')
| -rw-r--r-- | cfrontend/C2C.ml | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/cfrontend/C2C.ml b/cfrontend/C2C.ml index b68887c5..38ef45e7 100644 --- a/cfrontend/C2C.ml +++ b/cfrontend/C2C.ml @@ -251,6 +251,14 @@ let builtins_generic = { "__i64_sar", (TInt(ILongLong, []), [TInt(ILongLong, []); TInt(IInt, [])], + false); + "__i64_smulh", + (TInt(ILongLong, []), + [TInt(ILongLong, []); TInt(ILongLong, [])], + false); + "__i64_umulh", + (TInt(IULongLong, []), + [TInt(IULongLong, []); TInt(IULongLong, [])], false) ] } |