T0b1/wasmtime
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cranelift: only allow vector types with saturating arithmetic

Browse Source 
This fixes #2883 by restricting which types are available to the `uadd_sat`, `sadd_sat`, `usub_sat`, and `ssub_sat` IR operations.
This commit is contained in:
Andrew Brown
2021-05-11 11:34:56 -07:00
parent e676589b0c
commit 1fe7676831
3 changed files with 66 additions and 127 deletions
Download Patch File Download Diff File Expand all files Collapse all files

132
cranelift/codegen/meta/src/shared/instructions.rs
View File

@@ -693,6 +693,72 @@ fn define_simd_arithmetic(
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"uadd_sat",
r#"
Add with unsigned saturation.
This is similar to `iadd` but the operands are interpreted as unsigned integers and their
summed result, instead of wrapping, will be saturated to the highest unsigned integer for
the controlling type (e.g. `0xFF` for i8).
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"sadd_sat",
r#"
Add with signed saturation.
This is similar to `iadd` but the operands are interpreted as signed integers and their
summed result, instead of wrapping, will be saturated to the lowest or highest
signed integer for the controlling type (e.g. `0x80` or `0x7F` for i8). For example,
since an `sadd_sat.i8` of `0x70` and `0x70` is greater than `0x7F`, the result will be
clamped to `0x7F`.
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"usub_sat",
r#"
Subtract with unsigned saturation.
This is similar to `isub` but the operands are interpreted as unsigned integers and their
difference, instead of wrapping, will be saturated to the lowest unsigned integer for
the controlling type (e.g. `0x00` for i8).
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"ssub_sat",
r#"
Subtract with signed saturation.
This is similar to `isub` but the operands are interpreted as signed integers and their
difference, instead of wrapping, will be saturated to the lowest or highest
signed integer for the controlling type (e.g. `0x80` or `0x7F` for i8).
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
}
#[allow(clippy::many_single_char_names)]
@@ -2325,40 +2391,6 @@ pub(crate) fn define(
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"uadd_sat",
r#"
Add with unsigned saturation.
This is similar to `iadd` but the operands are interpreted as unsigned integers and their
summed result, instead of wrapping, will be saturated to the highest unsigned integer for
the controlling type (e.g. `0xFF` for i8).
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"sadd_sat",
r#"
Add with signed saturation.
This is similar to `iadd` but the operands are interpreted as signed integers and their
summed result, instead of wrapping, will be saturated to the lowest or highest
signed integer for the controlling type (e.g. `0x80` or `0x7F` for i8). For example,
since an `sadd_sat.i8` of `0x70` and `0x70` is greater than `0x7F`, the result will be
clamped to `0x7F`.
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"isub",
@@ -2374,38 +2406,6 @@ pub(crate) fn define(
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"usub_sat",
r#"
Subtract with unsigned saturation.
This is similar to `isub` but the operands are interpreted as unsigned integers and their
difference, instead of wrapping, will be saturated to the lowest unsigned integer for
the controlling type (e.g. `0x00` for i8).
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"ssub_sat",
r#"
Subtract with signed saturation.
This is similar to `isub` but the operands are interpreted as signed integers and their
difference, instead of wrapping, will be saturated to the lowest or highest
signed integer for the controlling type (e.g. `0x80` or `0x7F` for i8).
"#,
&formats.binary,
)
.operands_in(vec![x, y])
.operands_out(vec![a]),
);
ig.push(
Inst::new(
"ineg",