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aarch64: Use unsigned constants where appropriate (#5423)

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The Rust type expected in these locations is unsigned, but these
constants are negative. ISLE currently emits a Rust expression with
extra type conversions in order to make this work as intended.

However, across all backends, only these three aarch64 constants use
this particular "feature" of ISLE, and I want to make it go away.
This commit is contained in:
Jamey Sharp
2022-12-13 15:08:40 -08:00
committed by GitHub
parent 3ce896f69d
commit eba6b76511
1 changed files with 9 additions and 9 deletions
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18
cranelift/codegen/src/isa/aarch64/inst.isle
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@@ -3265,14 +3265,14 @@
(fpu_to_int op src))
(rule (fpu_to_int_cvt_sat op src $false (fits_in_16 out_ty))
(let ((result Reg (fpu_to_int op src))
(max Reg (imm out_ty (ImmExtend.Zero) -1)))
(max Reg (imm out_ty (ImmExtend.Zero) (ty_mask out_ty))))
(with_flags_reg
(cmp (OperandSize.Size32) result max)
(csel (Cond.Hi) max result))))
(rule (fpu_to_int_cvt_sat op src $true (fits_in_16 out_ty))
(let ((result Reg (fpu_to_int op src))
(max Reg (imm $I32 (ImmExtend.Sign) (signed_max out_ty)))
(min Reg (imm $I32 (ImmExtend.Sign) (signed_min out_ty)))
(max Reg (signed_max out_ty))
(min Reg (signed_min out_ty))
(result Reg (with_flags_reg
(cmp (operand_size out_ty) result max)
(csel (Cond.Gt) max result)))
@@ -3281,13 +3281,13 @@
(csel (Cond.Lt) min result))))
result))
(decl signed_min (Type) u64)
(rule (signed_min $I8) -128)
(rule (signed_min $I16) -32768)
(decl signed_min (Type) Reg)
(rule (signed_min $I8) (imm $I8 (ImmExtend.Sign) 0x80))
(rule (signed_min $I16) (imm $I16 (ImmExtend.Sign) 0x8000))
(decl signed_max (Type) u64)
(rule (signed_max $I8) 127)
(rule (signed_max $I16) 32767)
(decl signed_max (Type) Reg)
(rule (signed_max $I8) (imm $I8 (ImmExtend.Sign) 0x7F))
(rule (signed_max $I16) (imm $I16 (ImmExtend.Sign) 0x7FFF))
(decl fpu_to_int (FpuToIntOp Reg) Reg)
(rule (fpu_to_int op src)