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stage2: vectorize shl_with_overflow in LLVM backend

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William Sengir 2022-03-26 15:41:44 -07:00 committed by Andrew Kelley
parent c641fb8f05
commit c2cb9b7cad
1 changed files with 8 additions and 4 deletions
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12
src/codegen/llvm.zig
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@ -5899,26 +5899,30 @@ pub const FuncGen = struct {
const lhs_ty = self.air.typeOf(extra.lhs);
const rhs_ty = self.air.typeOf(extra.rhs);
const lhs_scalar_ty = lhs_ty.scalarType();
const rhs_scalar_ty = rhs_ty.scalarType();
const dest_ty = self.air.typeOfIndex(inst);
const llvm_dest_ty = try self.dg.llvmType(dest_ty);
const tg = self.dg.module.getTarget();
const casted_rhs = if (rhs_ty.bitSize(tg) < lhs_ty.bitSize(tg))
const casted_rhs = if (rhs_scalar_ty.bitSize(tg) < lhs_scalar_ty.bitSize(tg))
self.builder.buildZExt(rhs, try self.dg.llvmType(lhs_ty), "")
else
rhs;
const result = self.builder.buildShl(lhs, casted_rhs, "");
const reconstructed = if (lhs_ty.isSignedInt())
const reconstructed = if (lhs_scalar_ty.isSignedInt())
self.builder.buildAShr(result, casted_rhs, "")
else
self.builder.buildLShr(result, casted_rhs, "");
const overflow_bit = self.builder.buildICmp(.NE, lhs, reconstructed, "");
const partial = self.builder.buildInsertValue(llvm_dest_ty.getUndef(), result, 0, "");
return self.builder.buildInsertValue(partial, overflow_bit, 1, "");
var ty_buf: Type.Payload.Pointer = undefined;
const partial = self.builder.buildInsertValue(llvm_dest_ty.getUndef(), result, llvmFieldIndex(dest_ty, 0, tg, &ty_buf).?, "");
return self.builder.buildInsertValue(partial, overflow_bit, llvmFieldIndex(dest_ty, 1, tg, &ty_buf).?, "");
}
fn airAnd(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {