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[codegen] Add a pinned register that's entirely under the control of the user;

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This commit is contained in:
Benjamin Bouvier
2019-08-28 17:33:45 +02:00
parent d1d2e790b9
commit 660b8b28b8
15 changed files with 229 additions and 30 deletions
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20
cranelift/codegen/meta/src/isa/x86/recipes.rs
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@@ -351,6 +351,7 @@ pub(crate) fn define<'shared>(
let reg_rax = Register::new(gpr, regs.regunit_by_name(gpr, "rax"));
let reg_rcx = Register::new(gpr, regs.regunit_by_name(gpr, "rcx"));
let reg_rdx = Register::new(gpr, regs.regunit_by_name(gpr, "rdx"));
let reg_r15 = Register::new(gpr, regs.regunit_by_name(gpr, "r15"));
// Stack operand with a 32-bit signed displacement from either RBP or RSP.
let stack_gpr32 = Stack::new(gpr);
@@ -428,6 +429,25 @@ pub(crate) fn define<'shared>(
.emit(""),
);
recipes.add_recipe(
EncodingRecipeBuilder::new("get_pinned_reg", f_nullary, 0)
.operands_out(vec![reg_r15])
.emit(""),
);
// umr with a fixed register output that's r15.
recipes.add_template_recipe(
EncodingRecipeBuilder::new("set_pinned_reg", f_unary, 1)
.operands_in(vec![gpr])
.clobbers_flags(false)
.emit(
r#"
let r15 = RU::r15.into();
{{PUT_OP}}(bits, rex2(r15, in_reg0), sink);
modrm_rr(r15, in_reg0, sink);
"#,
),
);
// No-op fills, created by late-stage redundant-fill removal.
recipes.add_recipe(
EncodingRecipeBuilder::new("fillnull", f_unary, 0)