[clang] [CIR] Lowering __builtin_stdc_* calls (PR #214931)

[Kunal Dubey via cfe-commits]

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@@ -1247,6 +1286,91 @@ RValue CIRGenFunction::emitBuiltinExpr(const GlobalDecl &gd, unsigned builtinID,
                                            getTarget().isCLZForZeroUndef());
   case Builtin::BI__builtin_ctzg:
     return emitBuiltinBitOpWithFallback<cir::BitCtzOp>(*this, e);
+  case Builtin::BIstdc_trailing_zeros_uc:
+  case Builtin::BIstdc_trailing_zeros_us:
+  case Builtin::BIstdc_trailing_zeros_ui:
+  case Builtin::BIstdc_trailing_zeros_ul:
+  case Builtin::BIstdc_trailing_zeros_ull:
+  case Builtin::BI__builtin_stdc_trailing_zeros:
+    return emitStdcCountOp<cir::BitCtzOp>(*this, e, /*invertArg=*/false,
+                                          /*poisonZero=*/false);
+
+  case Builtin::BIstdc_leading_zeros_uc:
+  case Builtin::BIstdc_leading_zeros_us:
+  case Builtin::BIstdc_leading_zeros_ui:
+  case Builtin::BIstdc_leading_zeros_ul:
+  case Builtin::BIstdc_leading_zeros_ull:
+  case Builtin::BI__builtin_stdc_leading_zeros:
+    return emitStdcCountOp<cir::BitClzOp>(*this, e, /*invertArg=*/false,
+                                          /*poisonZero=*/false);
+
+  case Builtin::BIstdc_trailing_ones_uc:
+  case Builtin::BIstdc_trailing_ones_us:
+  case Builtin::BIstdc_trailing_ones_ui:
+  case Builtin::BIstdc_trailing_ones_ul:
+  case Builtin::BIstdc_trailing_ones_ull:
+  case Builtin::BI__builtin_stdc_trailing_ones:
+    return emitStdcCountOp<cir::BitCtzOp>(*this, e, /*invertArg=*/true,
+                                          /*poisonZero=*/false);
+
+  case Builtin::BIstdc_leading_ones_uc:
+  case Builtin::BIstdc_leading_ones_us:
+  case Builtin::BIstdc_leading_ones_ui:
+  case Builtin::BIstdc_leading_ones_ul:
+  case Builtin::BIstdc_leading_ones_ull:
+  case Builtin::BI__builtin_stdc_leading_ones:
+    return emitStdcCountOp<cir::BitClzOp>(*this, e, /*invertArg=*/true,
+                                          /*poisonZero=*/false);
+
+  case Builtin::BIstdc_bit_width_uc:
+  case Builtin::BIstdc_bit_width_us:
+  case Builtin::BIstdc_bit_width_ui:
+  case Builtin::BIstdc_bit_width_ul:
+  case Builtin::BIstdc_bit_width_ull:
+  case Builtin::BI__builtin_stdc_bit_width:
+    return emitStdcBitWidthMinus<cir::BitClzOp>(*this, e,
+                                                /*poisonZero=*/false);
+
+  case Builtin::BIstdc_count_zeros_uc:
+  case Builtin::BIstdc_count_zeros_us:
+  case Builtin::BIstdc_count_zeros_ui:
+  case Builtin::BIstdc_count_zeros_ul:
+  case Builtin::BIstdc_count_zeros_ull:
+  case Builtin::BI__builtin_stdc_count_zeros:
+    return emitStdcBitWidthMinus<cir::BitPopcountOp>(*this, e);
+
+  case Builtin::BIstdc_count_ones_uc:
+  case Builtin::BIstdc_count_ones_us:
+  case Builtin::BIstdc_count_ones_ui:
+  case Builtin::BIstdc_count_ones_ul:
+  case Builtin::BIstdc_count_ones_ull:
+  case Builtin::BI__builtin_stdc_count_ones:
+    return emitStdcCountOp<cir::BitPopcountOp>(*this, e,
+                                               /*invertArg=*/false);
+
+  case Builtin::BIstdc_has_single_bit_uc:
----------------
xakep8 wrote:

added a helper for calling cgm.errorNYI rather than directly adding to the switch case body.

https://github.com/llvm/llvm-project/pull/214931