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Sync from rust e1ec3260d79497080ca86540562d410ba67d2a95

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bjorn3 2022-05-15 12:25:32 +02:00
commit e5ff9f1b6d
1 changed files with 10 additions and 3 deletions
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13
src/intrinsics/mod.rs
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@ -713,14 +713,21 @@ fn codegen_regular_intrinsic_call<'tcx>(
ret.write_cvalue(fx, val);
};
ptr_offset_from, (v ptr, v base) {
ptr_offset_from | ptr_offset_from_unsigned, (v ptr, v base) {
let ty = substs.type_at(0);
let isize_layout = fx.layout_of(fx.tcx.types.isize);
let pointee_size: u64 = fx.layout_of(ty).size.bytes();
let diff = fx.bcx.ins().isub(ptr, base);
let diff_bytes = fx.bcx.ins().isub(ptr, base);
// FIXME this can be an exact division.
let val = CValue::by_val(fx.bcx.ins().sdiv_imm(diff, pointee_size as i64), isize_layout);
let diff = if intrinsic == sym::ptr_offset_from_unsigned {
// Because diff_bytes ULE isize::MAX, this would be fine as signed,
// but unsigned is slightly easier to codegen, so might as well.
fx.bcx.ins().udiv_imm(diff_bytes, pointee_size as i64)
} else {
fx.bcx.ins().sdiv_imm(diff_bytes, pointee_size as i64)
};
let val = CValue::by_val(diff, isize_layout);
ret.write_cvalue(fx, val);
};