diff options
| 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 /ia32/TargetPrinter.ml | |
| 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/TargetPrinter.ml')
| -rw-r--r-- | ia32/TargetPrinter.ml | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/ia32/TargetPrinter.ml b/ia32/TargetPrinter.ml index c3e70042..fbc219d1 100644 --- a/ia32/TargetPrinter.ml +++ b/ia32/TargetPrinter.ml @@ -438,8 +438,12 @@ module Target(System: SYSTEM):TARGET = fprintf oc " imulq %a, %a\n" intconst64 n ireg64 rd | Pimull_r(r1) -> fprintf oc " imull %a\n" ireg32 r1 + | Pimulq_r(r1) -> + fprintf oc " imulq %a\n" ireg64 r1 | Pmull_r(r1) -> fprintf oc " mull %a\n" ireg32 r1 + | Pmulq_r(r1) -> + fprintf oc " mulq %a\n" ireg64 r1 | Pcltd -> fprintf oc " cltd\n" | Pcqto -> |