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author | Xavier Leroy <xavier.leroy@inria.fr> | 2016-10-04 15:52:16 +0200 |
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committer | Xavier Leroy <xavier.leroy@inria.fr> | 2016-10-04 15:52:16 +0200 |
commit | d2af79a77ed2936ff0ed90cadf8e48637d774d4c (patch) | |
tree | 09300943e12a98ae80598c79d455b31725271ead /ia32/ValueAOp.v | |
parent | a44893028eb1dd434c68001234ad56d030205a8e (diff) | |
download | compcert-d2af79a77ed2936ff0ed90cadf8e48637d774d4c.tar.gz compcert-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 'ia32/ValueAOp.v')
-rw-r--r-- | ia32/ValueAOp.v | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/ia32/ValueAOp.v b/ia32/ValueAOp.v index c8b3278e..98f0dbb1 100644 --- a/ia32/ValueAOp.v +++ b/ia32/ValueAOp.v @@ -117,6 +117,8 @@ Definition eval_static_operation (op: operation) (vl: list aval): aval := | Osubl, v1::v2::nil => subl v1 v2 | Omull, v1::v2::nil => mull v1 v2 | Omullimm n, v1::nil => mull v1 (L n) + | Omullhs, v1::v2::nil => mullhs v1 v2 + | Omullhu, v1::v2::nil => mullhu v1 v2 | Odivl, v1::v2::nil => divls v1 v2 | Odivlu, v1::v2::nil => divlu v1 v2 | Omodl, v1::v2::nil => modls v1 v2 |