From 32dc2de667174727c8642e2366ebede9ad8bf568 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@codeaurora.org>
Date: Tue, 18 Nov 2014 22:41:49 +0000
Subject: [PATCH] [FastISel][AArch64] Also allow folding of sign-/zero-extend
 and arithmetic shift-right for booleans (i1).

Arithmetic shift-right immediate with sign-/zero-extensions also works for
boolean values.  Update the assert and the test cases to reflect that fact.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222272 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/AArch64/AArch64FastISel.cpp  |  5 ++-
 test/CodeGen/AArch64/fast-isel-shift.ll | 49 +++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/lib/Target/AArch64/AArch64FastISel.cpp b/lib/Target/AArch64/AArch64FastISel.cpp
index bedfae672bc..612cb00c7bf 100644
--- a/lib/Target/AArch64/AArch64FastISel.cpp
+++ b/lib/Target/AArch64/AArch64FastISel.cpp
@@ -4117,8 +4117,9 @@ unsigned AArch64FastISel::emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
                                      bool IsZExt) {
   assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
          "Unexpected source/return type pair.");
-  assert((SrcVT == MVT::i8 || SrcVT == MVT::i16 || SrcVT == MVT::i32 ||
-          SrcVT == MVT::i64) && "Unexpected source value type.");
+  assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
+          SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
+         "Unexpected source value type.");
   assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
           RetVT == MVT::i64) && "Unexpected return value type.");
 
diff --git a/test/CodeGen/AArch64/fast-isel-shift.ll b/test/CodeGen/AArch64/fast-isel-shift.ll
index 7e8ddc12683..ce4ba49f499 100644
--- a/test/CodeGen/AArch64/fast-isel-shift.ll
+++ b/test/CodeGen/AArch64/fast-isel-shift.ll
@@ -1,5 +1,54 @@
 ; RUN: llc -fast-isel -fast-isel-abort -mtriple=aarch64-apple-darwin -verify-machineinstrs < %s | FileCheck %s
 
+; CHECK-LABEL: asr_zext_i1_i16
+; CHECK:       uxth {{w[0-9]*}}, wzr
+define zeroext i16 @asr_zext_i1_i16(i1 %b) {
+  %1 = zext i1 %b to i16
+  %2 = ashr i16 %1, 1
+  ret i16 %2
+}
+
+; CHECK-LABEL: asr_sext_i1_i16
+; CHECK:       sbfx [[REG1:w[0-9]+]], {{w[0-9]*}}, #0, #1
+; CHECK-NEXT:  sxth {{w[0-9]*}}, [[REG1]]
+define signext i16 @asr_sext_i1_i16(i1 %b) {
+  %1 = sext i1 %b to i16
+  %2 = ashr i16 %1, 1
+  ret i16 %2
+}
+
+; CHECK-LABEL: asr_zext_i1_i32
+; CHECK:       mov {{w[0-9]*}}, wzr
+define i32 @asr_zext_i1_i32(i1 %b) {
+  %1 = zext i1 %b to i32
+  %2 = ashr i32 %1, 1
+  ret i32 %2
+}
+
+; CHECK-LABEL: asr_sext_i1_i32
+; CHECK:       sbfx  {{w[0-9]*}}, {{w[0-9]*}}, #0, #1
+define i32 @asr_sext_i1_i32(i1 %b) {
+  %1 = sext i1 %b to i32
+  %2 = ashr i32 %1, 1
+  ret i32 %2
+}
+
+; CHECK-LABEL: asr_zext_i1_i64
+; CHECK:       mov {{x[0-9]*}}, xzr
+define i64 @asr_zext_i1_i64(i1 %b) {
+  %1 = zext i1 %b to i64
+  %2 = ashr i64 %1, 1
+  ret i64 %2
+}
+
+; CHECK-LABEL: asr_sext_i1_i64
+; CHECK:       sbfx {{x[0-9]*}}, {{x[0-9]*}}, #0, #1
+define i64 @asr_sext_i1_i64(i1 %b) {
+  %1 = sext i1 %b to i64
+  %2 = ashr i64 %1, 1
+  ret i64 %2
+}
+
 ; CHECK-LABEL: lsr_zext_i1_i16
 ; CHECK:       uxth {{w[0-9]*}}, wzr
 define zeroext i16 @lsr_zext_i1_i16(i1 %b) {