breaking API changes to all readInt/writeInt functions & more

 * add `@bswap` builtin function. See #767
 * comptime evaluation facilities are improved to be able to
   handle a `@ptrCast` with a backing array.
 * `@truncate` allows "truncating" a u0 value to any integer
   type, and the result is always comptime known to be `0`.
 * when specifying pointer alignment in a type expression,
   the alignment value of pointers which do not have addresses
   at runtime is ignored, and always has the default/ABI alignment
 * threw in a fix to freebsd/x86_64.zig to update syntax from
   language changes
 * some improvements are pending #863

closes #638
closes #1733

std lib API changes
 * io.InStream().readIntNe renamed to readIntNative
 * io.InStream().readIntLe renamed to readIntLittle
 * io.InStream().readIntBe renamed to readIntBig
 * introduced io.InStream().readIntForeign
 * io.InStream().readInt has parameter order changed
 * io.InStream().readVarInt has parameter order changed
 * io.InStream().writeIntNe renamed to writeIntNative
 * introduced io.InStream().writeIntForeign
 * io.InStream().writeIntLe renamed to writeIntLittle
 * io.InStream().writeIntBe renamed to writeIntBig
 * io.InStream().writeInt has parameter order changed
 * mem.readInt has different parameters and semantics
 * introduced mem.readIntNative
 * introduced mem.readIntForeign
 * mem.readIntBE renamed to mem.readIntBig and different API
 * mem.readIntLE renamed to mem.readIntLittle and different API
 * introduced mem.readIntSliceNative
 * introduced mem.readIntSliceForeign
 * introduced mem.readIntSliceLittle
 * introduced mem.readIntSliceBig
 * introduced mem.readIntSlice
 * mem.writeInt has different parameters and semantics
 * introduced mem.writeIntNative
 * introduced mem.writeIntForeign
 * mem.writeIntBE renamed to mem.readIntBig and different semantics
 * mem.writeIntLE renamed to mem.readIntLittle and different semantics
 * introduced mem.writeIntSliceForeign
 * introduced mem.writeIntSliceNative
 * introduced mem.writeIntSliceBig
 * introduced mem.writeIntSliceLittle
 * introduced mem.writeIntSlice
 * removed mem.endianSwapIfLe
 * removed mem.endianSwapIfBe
 * removed mem.endianSwapIf
 * added mem.littleToNative
 * added mem.bigToNative
 * added mem.toNative
 * added mem.nativeTo
 * added mem.nativeToLittle
 * added mem.nativeToBig

1 files changed, 13 insertions, 0 deletions

diff --git a/src/all_types.hpp b/src/all_types.hpp
index f7ada09a57..83b7e8495f 100644
--- a/src/all_types.hpp
+++ b/src/all_types.hpp
@@ -1415,6 +1415,7 @@ enum BuiltinFnId {
     BuiltinFnIdErrorReturnTrace,
     BuiltinFnIdAtomicRmw,
     BuiltinFnIdAtomicLoad,
+    BuiltinFnIdBswap,
 };
 
 struct BuiltinFnEntry {
@@ -1487,6 +1488,7 @@ enum ZigLLVMFnId {
     ZigLLVMFnIdFloor,
     ZigLLVMFnIdCeil,
     ZigLLVMFnIdSqrt,
+    ZigLLVMFnIdBswap,
 };
 
 enum AddSubMul {
@@ -1516,6 +1518,9 @@ struct ZigLLVMFnKey {
             uint32_t bit_count;
             bool is_signed;
         } overflow_arithmetic;
+        struct {
+            uint32_t bit_count;
+        } bswap;
     } data;
 };
 
@@ -2158,6 +2163,7 @@ enum IrInstructionId {
     IrInstructionIdMergeErrRetTraces,
     IrInstructionIdMarkErrRetTracePtr,
     IrInstructionIdSqrt,
+    IrInstructionIdBswap,
     IrInstructionIdErrSetCast,
     IrInstructionIdToBytes,
     IrInstructionIdFromBytes,
@@ -3251,6 +3257,13 @@ struct IrInstructionCheckRuntimeScope {
     IrInstruction *is_comptime;
 };
 
+struct IrInstructionBswap {
+    IrInstruction base;
+
+    IrInstruction *type;
+    IrInstruction *op;
+};
+
 static const size_t slice_ptr_index = 0;
 static const size_t slice_len_index = 1;