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Add ineg legalization for scalar integer types (#1385)

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This commit is contained in:
Peter Delevoryas
2020-02-14 13:16:02 -08:00
committed by GitHub
parent 4d8cf563f3
commit 18b40d1101
6 changed files with 103 additions and 12 deletions
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16
cranelift/codegen/src/isa/x86/enc_tables.rs
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@@ -1213,7 +1213,7 @@ fn convert_insertlane(
}
}
/// For SIMD negation, convert an `ineg` to a `vconst + isub`.
/// For SIMD or scalar integer negation, convert `ineg` to `vconst + isub` or `iconst + isub`.
fn convert_ineg(
inst: ir::Inst,
func: &mut ir::Function,
@@ -1229,10 +1229,16 @@ fn convert_ineg(
} = pos.func.dfg[inst]
{
let value_type = pos.func.dfg.value_type(arg);
if value_type.is_vector() && value_type.lane_type().is_int() {
let zero_value = if value_type.is_vector() && value_type.lane_type().is_int() {
let zero_immediate = pos.func.dfg.constants.insert(vec![0; 16].into());
let zero_value = pos.ins().vconst(value_type, zero_immediate); // this should be legalized to a PXOR
pos.func.dfg.replace(inst).isub(zero_value, arg);
}
pos.ins().vconst(value_type, zero_immediate) // this should be legalized to a PXOR
} else if value_type.is_int() {
pos.ins().iconst(value_type, 0)
} else {
panic!("Can't convert ineg of type {}", value_type)
};
pos.func.dfg.replace(inst).isub(zero_value, arg);
} else {
unreachable!()
}
}