[llvm] r345162 - [InstCombine] add test for ComputeNumSignBits with shuffle; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Wed Oct 24 10:01:42 2018
New Revision: 345162

URL: http://llvm.org/viewvc/llvm-project?rev=345162&view=rev
Log:
[InstCombine] add test for ComputeNumSignBits with shuffle; NFC

Modified:
    llvm/trunk/test/Transforms/InstCombine/nsw.ll

Modified: llvm/trunk/test/Transforms/InstCombine/nsw.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/nsw.ll?rev=345162&r1=345161&r2=345162&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/nsw.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/nsw.ll Wed Oct 24 10:01:42 2018
@@ -1,83 +1,116 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -instcombine -S | FileCheck %s
 
-; CHECK-LABEL: @sub1(
-; CHECK: %y = sub i32 0, %x
-; CHECK: %z = sdiv i32 %y, 337
-; CHECK: ret i32 %z
 define i32 @sub1(i32 %x) {
+; CHECK-LABEL: @sub1(
+; CHECK-NEXT:    [[Y:%.*]] = sub i32 0, [[X:%.*]]
+; CHECK-NEXT:    [[Z:%.*]] = sdiv i32 [[Y]], 337
+; CHECK-NEXT:    ret i32 [[Z]]
+;
   %y = sub i32 0, %x
   %z = sdiv i32 %y, 337
   ret i32 %z
 }
 
-; CHECK-LABEL: @sub2(
-; CHECK: %z = sdiv i32 %x, -337
-; CHECK: ret i32 %z
 define i32 @sub2(i32 %x) {
+; CHECK-LABEL: @sub2(
+; CHECK-NEXT:    [[Z:%.*]] = sdiv i32 [[X:%.*]], -337
+; CHECK-NEXT:    ret i32 [[Z]]
+;
   %y = sub nsw i32 0, %x
   %z = sdiv i32 %y, 337
   ret i32 %z
 }
 
+define i1 @shl_icmp(i64 %X) {
 ; CHECK-LABEL: @shl_icmp(
-; CHECK: %B = icmp eq i64 %X, 0
-; CHECK: ret i1 %B
-define i1 @shl_icmp(i64 %X) nounwind {
+; CHECK-NEXT:    [[B:%.*]] = icmp eq i64 [[X:%.*]], 0
+; CHECK-NEXT:    ret i1 [[B]]
+;
   %A = shl nuw i64 %X, 2   ; X/4
   %B = icmp eq i64 %A, 0
   ret i1 %B
 }
 
+define i64 @shl1(i64 %X, i64* %P) {
 ; CHECK-LABEL: @shl1(
-; CHECK: %B = shl nuw nsw i64 %A, 8
-; CHECK: ret i64 %B
-define i64 @shl1(i64 %X, i64* %P) nounwind {
+; CHECK-NEXT:    [[A:%.*]] = and i64 [[X:%.*]], 312
+; CHECK-NEXT:    store i64 [[A]], i64* [[P:%.*]], align 4
+; CHECK-NEXT:    [[B:%.*]] = shl nuw nsw i64 [[A]], 8
+; CHECK-NEXT:    ret i64 [[B]]
+;
   %A = and i64 %X, 312
   store i64 %A, i64* %P  ; multiple uses of A.
   %B = shl i64 %A, 8
   ret i64 %B
 }
 
+define i32 @preserve1(i32 %x) {
 ; CHECK-LABEL: @preserve1(
-; CHECK: add nsw i32 %x, 5
-define i32 @preserve1(i32 %x) nounwind {
+; CHECK-NEXT:    [[ADD3:%.*]] = add nsw i32 [[X:%.*]], 5
+; CHECK-NEXT:    ret i32 [[ADD3]]
+;
   %add = add nsw i32 %x, 2
   %add3 = add nsw i32 %add, 3
   ret i32 %add3
 }
 
+define i8 @nopreserve1(i8 %x) {
 ; CHECK-LABEL: @nopreserve1(
-; CHECK: add i8 %x, -126
-define i8 @nopreserve1(i8 %x) nounwind {
+; CHECK-NEXT:    [[ADD3:%.*]] = add i8 [[X:%.*]], -126
+; CHECK-NEXT:    ret i8 [[ADD3]]
+;
   %add = add nsw i8 %x, 127
   %add3 = add nsw i8 %add, 3
   ret i8 %add3
 }
 
+define i8 @nopreserve2(i8 %x) {
 ; CHECK-LABEL: @nopreserve2(
-; CHECK: add i8 %x, 3
-define i8 @nopreserve2(i8 %x) nounwind {
+; CHECK-NEXT:    [[ADD3:%.*]] = add i8 [[X:%.*]], 3
+; CHECK-NEXT:    ret i8 [[ADD3]]
+;
   %add = add i8 %x, 1
   %add3 = add nsw i8 %add, 2
   ret i8 %add3
 }
 
+define i8 @nopreserve3(i8 %A, i8 %B) {
 ; CHECK-LABEL: @nopreserve3(
-; CHECK: add i8 %A, %B
-; CHECK: add i8
-define i8 @nopreserve3(i8 %A, i8 %B) nounwind {
+; CHECK-NEXT:    [[Y:%.*]] = add i8 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[ADD:%.*]] = add i8 [[Y]], 20
+; CHECK-NEXT:    ret i8 [[ADD]]
+;
   %x = add i8 %A, 10
   %y = add i8 %B, 10
   %add = add nsw i8 %x, %y
   ret i8 %add
 }
 
+define i8 @nopreserve4(i8 %A, i8 %B) {
 ; CHECK-LABEL: @nopreserve4(
-; CHECK: add i8 %A, %B
-; CHECK: add i8
-define i8 @nopreserve4(i8 %A, i8 %B) nounwind {
+; CHECK-NEXT:    [[Y:%.*]] = add i8 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[ADD:%.*]] = add i8 [[Y]], 20
+; CHECK-NEXT:    ret i8 [[ADD]]
+;
   %x = add nsw i8 %A, 10
   %y = add nsw i8 %B, 10
   %add = add nsw i8 %x, %y
   ret i8 %add
 }
+
+; TODO: ComputeNumSignBits()/computeKnownBits() should look through a shufflevector.
+
+define <3 x i32> @shl_nuw_nsw_shuffle_splat_vec(<2 x i8> %x) {
+; CHECK-LABEL: @shl_nuw_nsw_shuffle_splat_vec(
+; CHECK-NEXT:    [[T2:%.*]] = zext <2 x i8> [[X:%.*]] to <2 x i32>
+; CHECK-NEXT:    [[SHUF:%.*]] = shufflevector <2 x i32> [[T2]], <2 x i32> undef, <3 x i32> <i32 1, i32 0, i32 1>
+; CHECK-NEXT:    [[T3:%.*]] = shl <3 x i32> [[SHUF]], <i32 17, i32 17, i32 17>
+; CHECK-NEXT:    ret <3 x i32> [[T3]]
+;
+  %t2 = zext <2 x i8> %x to <2 x i32>
+  %shuf = shufflevector <2 x i32> %t2, <2 x i32> undef, <3 x i32> <i32 1, i32 0, i32 1>
+  %t3 = shl <3 x i32> %shuf, <i32 17, i32 17, i32 17>
+  ret <3 x i32> %t3
+}
+