Merge remote-tracking branch 'origin/master' into master-next

Author: swift-ci

test/SILOptimizer/utf8_decoding_fastpath.swift

@@ -0,0 +1,112 @@
+// RUN: %target-swift-frontend -Xllvm -swiftmergefunc-threshold=0 -parse-as-library -O -target-cpu core2 -emit-ir  %s | %FileCheck %s
+// REQUIRES: optimized_stdlib,CPU=x86_64
+
+// This is an end-to-end test to ensure that the optimizer generates
+// good code for various ways to create a String from a Sequence of UTF-8
+// bytes for which a fast path exists.
+
+// Please note: this test targets "core2" to ensure consistent output
+// on all x86 host processors.
+
+@inline(never)
+func blackhole<T>(_ value: T) {}
+
+// UnsafeBufferPointer<UInt8>
+// ==========================
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}s22utf8_decoding_fastpath15decodeUBPAsUTF8ySSSRys5UInt8VGF{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: ret
+public func decodeUBPAsUTF8(_ ptr: UnsafeBufferPointer<UInt8>) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// UnsafeMutableBufferPointer<UInt8>
+// =================================
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}s22utf8_decoding_fastpath16decodeUMBPAsUTF8ySSSrys5UInt8VGF{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: ret
+public func decodeUMBPAsUTF8(_ ptr: UnsafeMutableBufferPointer<UInt8>) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// Array<UInt8>
+// ============
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeArrayAsUTF8{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: ret
+public func decodeArrayAsUTF8(_ ptr: [UInt8]) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// UnsafeRawBufferPointer
+// ======================
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeURBPAsUTF8{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: ret
+public func decodeURBPAsUTF8(_ ptr: UnsafeRawBufferPointer) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// UnsafeMutableRawBufferPointer
+// =============================
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeUMRBPAsUTF8{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: ret
+public func decodeUMRBPAsUTF8(_ ptr: UnsafeMutableRawBufferPointer) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// String.UTF8View
+// ===============
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeStringUTF8ViewAs{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: br
+public func decodeStringUTF8ViewAsUTF8(_ ptr: String.UTF8View) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// Substring.UTF8View
+// ==================
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeSubstringUTF8ViewAs{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: br
+public func decodeSubstringUTF8ViewAsUTF8(_ ptr: Substring.UTF8View) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// Slice<UBP>
+// ==========
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeUBPSliceAsUTF8{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK-LAST: br
+public func decodeUBPSliceAsUTF8(_ ptr: Slice<UnsafeBufferPointer<UInt8>>) -> String {
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}
+
+// Slice<URBP>
+// ===========
+// CHECK-LABEL: define {{.*}}swiftcc {{.*}}decodeURBPSliceAsUTF8{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: {{.*}} = call swiftcc {{.*}} @"$sSS18_fromUTF8Repairing{{.*}}
+// CHECK-NOT: _fromCodeUnits
+// CHECK: ret
+public func decodeURBPSliceAsUTF8(_ ptr: Slice<UnsafeBufferPointer<UInt8>>) -> String {
+  blackhole("foo") // otherwise it just jumps into the Slice<UBP> version
+  return String(decoding: ptr, as: Unicode.UTF8.self)
+}