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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2019-04-12 15:47:49 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2019-05-20 18:00:46 +0200 |
| commit | e9cca9c8166fadb16c64df0fbb0b9ca640c0f594 (patch) | |
| tree | 58fe5d8dd5d7e39c99539b35f983b6d22ceac9d9 /powerpc/Machregs.v | |
| parent | 5b7fc96afb149ad916a9bf5015fe1eb2e0baaa7c (diff) | |
| download | compcert-kvx-e9cca9c8166fadb16c64df0fbb0b9ca640c0f594.tar.gz compcert-kvx-e9cca9c8166fadb16c64df0fbb0b9ca640c0f594.zip | |
PowerPC: make sure evaluation of conditions do not destroy any register
This will be useful to implement a "select" (conditional move) operation later.
- Introduce `Asmgen.loadimm64_notemp` to load a 64-bit integer
constant into a register without going through memory and without
needing a temporary register.
- Use `Asmgen.loadimm64_notemp` instead of `Asmgen.loadimm64` in the
compilation of conditions, so that GPR12 is no longer needed as a
temporary.
- Share code and proofs common to the two `Asmgen.loadimm64_` functions
as the `Asmgen.loadimm64_32s` function.
Diffstat (limited to 'powerpc/Machregs.v')
| -rw-r--r-- | powerpc/Machregs.v | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/powerpc/Machregs.v b/powerpc/Machregs.v index 53d99e2f..e7c8758b 100644 --- a/powerpc/Machregs.v +++ b/powerpc/Machregs.v @@ -159,11 +159,7 @@ Definition register_by_name (s: string) : option mreg := (** ** Destroyed registers, preferred registers *) -Definition destroyed_by_cond (cond: condition): list mreg := - match cond with - | Ccomplimm _ _ | Ccompluimm _ _ => R12 :: nil - | _ => nil - end. +Definition destroyed_by_cond (cond: condition): list mreg := nil. Definition destroyed_by_op (op: operation): list mreg := match op with |