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, 6 insertions, 1 deletions

diff --git a/src/analyze.cpp b/src/analyze.cpp
index 2f4b173c5f..46686ce772 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -401,7 +401,8 @@ ZigType *get_promise_type(CodeGen *g, ZigType *result_type) {
 }
 
 ZigType *get_pointer_to_type_extra(CodeGen *g, ZigType *child_type, bool is_const,
-        bool is_volatile, PtrLen ptr_len, uint32_t byte_alignment, uint32_t bit_offset_in_host, uint32_t host_int_bytes)
+        bool is_volatile, PtrLen ptr_len, uint32_t byte_alignment,
+        uint32_t bit_offset_in_host, uint32_t host_int_bytes)
 {
     assert(!type_is_invalid(child_type));
     assert(ptr_len == PtrLenSingle || child_type->id != ZigTypeIdOpaque);
@@ -6110,6 +6111,8 @@ uint32_t zig_llvm_fn_key_hash(ZigLLVMFnKey x) {
             return (uint32_t)(x.data.floating.bit_count) * (uint32_t)1953839089;
         case ZigLLVMFnIdSqrt:
             return (uint32_t)(x.data.floating.bit_count) * (uint32_t)2225366385;
+        case ZigLLVMFnIdBswap:
+            return (uint32_t)(x.data.bswap.bit_count) * (uint32_t)3661994335;
         case ZigLLVMFnIdOverflowArithmetic:
             return ((uint32_t)(x.data.overflow_arithmetic.bit_count) * 87135777) +
                 ((uint32_t)(x.data.overflow_arithmetic.add_sub_mul) * 31640542) +
@@ -6128,6 +6131,8 @@ bool zig_llvm_fn_key_eql(ZigLLVMFnKey a, ZigLLVMFnKey b) {
             return a.data.clz.bit_count == b.data.clz.bit_count;
         case ZigLLVMFnIdPopCount:
             return a.data.pop_count.bit_count == b.data.pop_count.bit_count;
+        case ZigLLVMFnIdBswap:
+            return a.data.bswap.bit_count == b.data.bswap.bit_count;
         case ZigLLVMFnIdFloor:
         case ZigLLVMFnIdCeil:
         case ZigLLVMFnIdSqrt: