compiler_rt: add __negsi2, __negdi2, __negti2

- use negXi2.zig to prevent confusion with negXf2.zig
- used for size optimized builds and machines without carry instruction
- tests: special cases 0, -INT_MIN
  * use divTrunc range and shift with constant offsets

See #1290

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/std/special/compiler_rt.zig b/lib/std/special/compiler_rt.zig
index 95edfee861..e9f422be59 100644
--- a/lib/std/special/compiler_rt.zig
+++ b/lib/std/special/compiler_rt.zig
@@ -382,6 +382,12 @@ comptime {
         }
 
         // Integral arithmetic
+        const __negsi2 = @import("compiler_rt/negXi2.zig").__negsi2;
+        @export(__negsi2, .{ .name = "__negsi2", .linkage = linkage });
+        const __negdi2 = @import("compiler_rt/negXi2.zig").__negdi2;
+        @export(__negdi2, .{ .name = "__negdi2", .linkage = linkage });
+        const __negti2 = @import("compiler_rt/negXi2.zig").__negti2;
+        @export(__negti2, .{ .name = "__negti2", .linkage = linkage });
         const __mulsi3 = @import("compiler_rt/int.zig").__mulsi3;
         @export(__mulsi3, .{ .name = "__mulsi3", .linkage = linkage });
         const __muldi3 = @import("compiler_rt/muldi3.zig").__muldi3;