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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/Asmgen.v | |
| 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 'ia32/Asmgen.v')
| -rw-r--r-- | ia32/Asmgen.v | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/ia32/Asmgen.v b/ia32/Asmgen.v index ccf2e6fd..bb26d507 100644 --- a/ia32/Asmgen.v +++ b/ia32/Asmgen.v @@ -453,6 +453,14 @@ Definition transl_op | Omullimm n, a1 :: nil => assertion (mreg_eq a1 res); do r <- ireg_of res; OK (Pimulq_ri r n :: k) + | Omullhs, a1 :: a2 :: nil => + assertion (mreg_eq a1 AX); + assertion (mreg_eq res DX); + do r2 <- ireg_of a2; OK (Pimulq_r r2 :: k) + | Omullhu, a1 :: a2 :: nil => + assertion (mreg_eq a1 AX); + assertion (mreg_eq res DX); + do r2 <- ireg_of a2; OK (Pmulq_r r2 :: k) | Odivl, a1 :: a2 :: nil => assertion (mreg_eq a1 AX); assertion (mreg_eq a2 CX); |