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machinst x64: mask shift count too;

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This commit is contained in:
Benjamin Bouvier
2020-09-08 18:33:36 +02:00
parent 9c328cc64b
commit 9620ce6bdf
1 changed files with 2 additions and 6 deletions
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8
cranelift/codegen/src/isa/x64/lower.rs
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@@ -655,12 +655,8 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(
}; };
let (count, rhs) = if let Some(cst) = ctx.get_input(insn, 1).constant { let (count, rhs) = if let Some(cst) = ctx.get_input(insn, 1).constant {
let cst = if op == Opcode::Rotl || op == Opcode::Rotr { // Mask count, according to Cranelift's semantics.
// Mask rotation count, according to Cranelift's semantics. let cst = (cst as u8) & (dst_ty.bits() as u8 - 1);
(cst as u8) & (dst_ty.bits() as u8 - 1)
} else {
cst as u8
};
(Some(cst), None) (Some(cst), None)
} else { } else {
(None, Some(input_to_reg(ctx, inputs[1]))) (None, Some(input_to_reg(ctx, inputs[1])))