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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 /ia32/NeedOp.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/NeedOp.v')
| -rw-r--r-- | ia32/NeedOp.v | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/ia32/NeedOp.v b/ia32/NeedOp.v index 575532b1..09013cdd 100644 --- a/ia32/NeedOp.v +++ b/ia32/NeedOp.v @@ -95,10 +95,7 @@ Definition needs_of_operation (op: operation) (nv: nval): list nval := | Osubl => op2 (default nv) | Omull => op2 (default nv) | Omullimm _ => op1 (default nv) - | Odivl => op2 (default nv) - | Odivlu => op2 (default nv) - | Omodl => op2 (default nv) - | Omodlu => op2 (default nv) + | Omullhs | Omullhu | Odivl | Odivlu | Omodl | Omodlu => op2 (default nv) | Oandl => op2 (default nv) | Oandlimm _ => op1 (default nv) | Oorl => op2 (default nv) |