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cleanup overflow binop code #28

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merged 19 commits into from
Jun 20, 2016
Merged

cleanup overflow binop code #28

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58b4fac
implement overflowing ops
oli-obk Jun 17, 2016
3ba4f6d
remove code repetition and fix overflowing intrinsics
oli-obk Jun 17, 2016
6376ef4
run the *compiled* run-pass tests on the host machine
oli-obk Jun 17, 2016
4f48bef
cfail test for std::env::args()
oli-obk Jun 17, 2016
e3a2bf8
clippy
oli-obk Jun 17, 2016
00eb198
implement fn -> unsafe fn pointer casts
oli-obk Jun 17, 2016
874d683
improve method names and add documentation
oli-obk Jun 20, 2016
d977642
compiletest 2.0 uses json errors and doesn't depend on the output for…
oli-obk Jun 20, 2016
e90ee16
fix comparing of function pointers
oli-obk Jun 20, 2016
a1082b9
Merge remote-tracking branch 'origin/master' into oflo
oli-obk Jun 20, 2016
ed4af21
fix master
oli-obk Jun 20, 2016
b9ac85d
rustc does overflow checking for us, don't duplicate it.
oli-obk Jun 20, 2016
68469be
rename function cache member
oli-obk Jun 20, 2016
0821a15
no need for EvalContext::eval_binop
oli-obk Jun 20, 2016
3e3aeab
implement bit masks as the compiler would translate them
oli-obk Jun 20, 2016
a088f10
add a comment explaining the magic numbers
oli-obk Jun 20, 2016
001ae69
remove the bad rhs value error and panic instead. the typechecker pre…
oli-obk Jun 20, 2016
c7039db
simplify the masked rhs computation
oli-obk Jun 20, 2016
65de5dd
simplify even more
oli-obk Jun 20, 2016
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18 changes: 10 additions & 8 deletions src/primval.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -82,17 +82,19 @@ pub fn binary_op<'tcx>(bin_op: mir::BinOp, left: PrimVal, right: PrimVal) -> Eva
U64(_) => 6,
_ => unreachable!(),
};
let mask = (1 << mask_bits) - 1;
let r = match right {
I8(i) => (i & ((1 << mask_bits) - 1)) as u32,
I16(i) => (i & ((1 << mask_bits) - 1)) as u32,
I32(i) => (i & ((1 << mask_bits) - 1)) as u32,
I64(i) => (i & ((1 << mask_bits) - 1)) as u32,
U8(i) => (i & ((1 << mask_bits) - 1)) as u32,
U16(i) => (i & ((1 << mask_bits) - 1)) as u32,
U32(i) => (i & ((1 << mask_bits) - 1)) as u32,
U64(i) => (i & ((1 << mask_bits) - 1)) as u32,
I8(i) => i as u8 & mask,
I16(i) => i as u8 & mask,
I32(i) => i as u8 & mask,
I64(i) => i as u8 & mask,
U8(i) => i as u8 & mask,
U16(i) => i as u8 & mask,
U32(i) => i as u8 & mask,
U64(i) => i as u8 & mask,
_ => panic!("bad MIR: bitshift rhs is not integral"),
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@solson Do you have things set up so you can use bug! and span_bug! from librustc? I think those would be preferred.

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That should be possible. I filed #32.

};
let r = r as u32;
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This isn't necessary, is it?

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Also, & mask can be done just once, afterwards.

macro_rules! shift {
($v:ident, $l:ident, $r:ident) => ({
match bin_op {
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