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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/Asmgenproof.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/Asmgenproof.v')
| -rw-r--r-- | powerpc/Asmgenproof.v | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/powerpc/Asmgenproof.v b/powerpc/Asmgenproof.v index 8ad28aea..d0d82cb5 100644 --- a/powerpc/Asmgenproof.v +++ b/powerpc/Asmgenproof.v @@ -179,14 +179,28 @@ Proof. Qed. Hint Resolve rolm_label: labels. +Remark loadimm64_32s_label: + forall r n k, tail_nolabel k (loadimm64_32s r n k). +Proof. + unfold loadimm64_32s; intros. destruct Int64.eq; TailNoLabel. +Qed. +Hint Resolve loadimm64_32s_label: labels. + Remark loadimm64_label: forall r n k, tail_nolabel k (loadimm64 r n k). Proof. - unfold loadimm64; intros. - destruct Int64.eq. TailNoLabel. destruct Int64.eq; TailNoLabel. + unfold loadimm64; intros. destruct Int64.eq; TailNoLabel. Qed. Hint Resolve loadimm64_label: labels. +Remark loadimm64_notemp_label: + forall r n k, tail_nolabel k (loadimm64_notemp r n k). +Proof. + unfold loadimm64_notemp; intros. destruct Int64.eq; TailNoLabel. + eapply tail_nolabel_trans; TailNoLabel. +Qed. +Hint Resolve loadimm64_notemp_label: labels. + Remark loadind_label: forall base ofs ty dst k c, loadind base ofs ty dst k = OK c -> tail_nolabel k c. |