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Use LLVM intrinsics for saturating add/sub

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This commit is contained in:
Nikita Popov 2019-01-29 22:16:43 +01:00
parent d8a0dd7ae8
commit 4a4186e4d1
5 changed files with 101 additions and 3 deletions
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24
src/librustc_codegen_llvm/context.rs
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@ -757,6 +757,30 @@ impl CodegenCx<'b, 'tcx> {
ifn!("llvm.umul.with.overflow.i64", fn(t_i64, t_i64) -> mk_struct!{t_i64, i1});
ifn!("llvm.umul.with.overflow.i128", fn(t_i128, t_i128) -> mk_struct!{t_i128, i1});
ifn!("llvm.sadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
ifn!("llvm.sadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
ifn!("llvm.sadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
ifn!("llvm.sadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
ifn!("llvm.sadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
ifn!("llvm.uadd.sat.i8", fn(t_i8, t_i8) -> t_i8);
ifn!("llvm.uadd.sat.i16", fn(t_i16, t_i16) -> t_i16);
ifn!("llvm.uadd.sat.i32", fn(t_i32, t_i32) -> t_i32);
ifn!("llvm.uadd.sat.i64", fn(t_i64, t_i64) -> t_i64);
ifn!("llvm.uadd.sat.i128", fn(t_i128, t_i128) -> t_i128);
ifn!("llvm.ssub.sat.i8", fn(t_i8, t_i8) -> t_i8);
ifn!("llvm.ssub.sat.i16", fn(t_i16, t_i16) -> t_i16);
ifn!("llvm.ssub.sat.i32", fn(t_i32, t_i32) -> t_i32);
ifn!("llvm.ssub.sat.i64", fn(t_i64, t_i64) -> t_i64);
ifn!("llvm.ssub.sat.i128", fn(t_i128, t_i128) -> t_i128);
ifn!("llvm.usub.sat.i8", fn(t_i8, t_i8) -> t_i8);
ifn!("llvm.usub.sat.i16", fn(t_i16, t_i16) -> t_i16);
ifn!("llvm.usub.sat.i32", fn(t_i32, t_i32) -> t_i32);
ifn!("llvm.usub.sat.i64", fn(t_i64, t_i64) -> t_i64);
ifn!("llvm.usub.sat.i128", fn(t_i128, t_i128) -> t_i128);
ifn!("llvm.lifetime.start", fn(t_i64,i8p) -> void);
ifn!("llvm.lifetime.end", fn(t_i64, i8p) -> void);