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wasm: implement all subtraction operators (checked, wrapping, panicking, and saturated)

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Brian Carroll 2022-06-22 22:54:09 +01:00
parent bbccaf4cd2
commit f4ec2617fa
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7 changed files with 223 additions and 71 deletions
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24
compiler/gen_llvm/src/llvm/build.rs
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@ -6960,29 +6960,7 @@ fn build_float_binop<'a, 'ctx, 'env>(
struct_value.into()
}
NumAddWrap => unreachable!("wrapping addition is not defined on floats"),
NumSub => {
let builder = env.builder;
let context = env.context;
let result = bd.build_float_sub(lhs, rhs, "sub_float");
let is_finite =
call_bitcode_fn(env, &[result.into()], &bitcode::NUM_IS_FINITE[float_width])
.into_int_value();
let then_block = context.append_basic_block(parent, "then_block");
let throw_block = context.append_basic_block(parent, "throw_block");
builder.build_conditional_branch(is_finite, then_block, throw_block);
builder.position_at_end(throw_block);
throw_exception(env, "float subtraction overflowed!");
builder.position_at_end(then_block);
result.into()
}
NumSub => bd.build_float_sub(lhs, rhs, "sub_float").into(),
NumSubChecked => {
let context = env.context;