Commit 38ba425b26312ea073c7082e576e8583913139d7 | zig

author	Matthew Lugg <mlugg@mlugg.co.uk> 2025-08-12 22:58:52+01:00
committer	Matthew Lugg <mlugg@mlugg.co.uk> 2025-08-13 11:36:16+01:00
log	38ba425b26312ea073c7082e576e8583913139d7
tree	40fb6ec72a7482dd77ec7f55aa9c70a73c4d6981
parent	b8124d9c0b01e8ac7cd0daf93a0ed018da5f2352
signature	Commit is signed but in an unrecognized format.

Resolves: #23533

1 files changed, 4 insertions(+), 1 deletions(-)

src/codegen/llvm.zig+4-1

 @@ -10475,11 +10475,14 @@ pub const FuncGen = struct {
         const slice_ty = self.typeOfIndex(inst);
         const slice_llvm_ty = try o.lowerType(pt, slice_ty);
+        // If operand is small (e.g. `u8`), then signedness becomes a problem -- GEP always treats the index as signed.
+        const extended_operand = try self.wip.conv(.unsigned, operand, try o.lowerType(pt, .usize), "");
         const error_name_table_ptr = try self.getErrorNameTable();
         const error_name_table =
             try self.wip.load(.normal, .ptr, error_name_table_ptr.toValue(&o.builder), .default, "");
         const error_name_ptr =
-            try self.wip.gep(.inbounds, slice_llvm_ty, error_name_table, &.{operand}, "");
+            try self.wip.gep(.inbounds, slice_llvm_ty, error_name_table, &.{extended_operand}, "");
         return self.wip.load(.normal, slice_llvm_ty, error_name_ptr, .default, "");
     }