[SLP][NFC]Replace unreachable instructions by rets, NFC.

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/X86/insertelements-with-reused-indices.ll

@@ -10,7 +10,7 @@ define void @test() {
 ; CHECK-NEXT:    [[TMP3:%.*]] = insertelement <4 x float> [[TMP2]], float 0.000000e+00, i32 0
 ; CHECK-NEXT:    [[TMP4:%.*]] = fsub float 0.000000e+00, 0.000000e+00
 ; CHECK-NEXT:    [[TMP5:%.*]] = insertelement <2 x float> zeroinitializer, float [[TMP4]], i32 0
-; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    ret void
 ;
 entry:
   %0 = fsub float 0.000000e+00, 0.000000e+00
@@ -23,5 +23,5 @@ entry:
   %7 = fsub float 0.000000e+00, %0
   %8 = fsub float %7, %4
   %9 = insertelement <2 x float> zeroinitializer, float %8, i32 0
-  unreachable
+  ret void
 }

llvm/test/Transforms/SLPVectorizer/X86/partail.ll

@@ -37,7 +37,7 @@ define void @get_block(i32 %y_pos) local_unnamed_addr #0 {
 ; CHECK-NEXT:    [[COND_I5_I_3:%.*]] = select i1 [[CMP_I4_I_3]], i32 [[COND_I_I_3]], i32 undef
 ; CHECK-NEXT:    [[IDXPROM30_3:%.*]] = sext i32 [[COND_I5_I_3]] to i64
 ; CHECK-NEXT:    [[ARRAYIDX31_3:%.*]] = getelementptr inbounds ptr, ptr undef, i64 [[IDXPROM30_3]]
-; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    ret void
 ;
 entry:
   br label %land.lhs.true
@@ -75,5 +75,5 @@ if.end:                                           ; preds = %land.lhs.true
   %cond.i5.i.3 = select i1 %cmp.i4.i.3, i32 %cond.i.i.3, i32 undef
   %idxprom30.3 = sext i32 %cond.i5.i.3 to i64
   %arrayidx31.3 = getelementptr inbounds ptr, ptr undef, i64 %idxprom30.3
-  unreachable
+  ret void
 }

llvm/test/Transforms/SLPVectorizer/X86/slp-throttle.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -passes=slp-vectorizer -S -mtriple=x86_64-unknown-linux-gnu -mcpu=bdver2 < %s | FileCheck %s
 
-define dso_local void @rftbsub(ptr %a) local_unnamed_addr #0 {
+define void @rftbsub(ptr %a) {
 ; CHECK-LABEL: @rftbsub(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[ARRAYIDX6:%.*]] = getelementptr inbounds double, ptr [[A:%.*]], i64 2
@@ -17,7 +17,7 @@ define dso_local void @rftbsub(ptr %a) local_unnamed_addr #0 {
 ; CHECK-NEXT:    [[TMP4:%.*]] = insertelement <2 x double> [[TMP3]], double [[SUB22]], i32 1
 ; CHECK-NEXT:    [[TMP5:%.*]] = fsub <2 x double> [[TMP2]], [[TMP4]]
 ; CHECK-NEXT:    store <2 x double> [[TMP5]], ptr [[ARRAYIDX6]], align 8
-; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    ret void
 ;
 entry:
   %arrayidx6 = getelementptr inbounds double, ptr %a, i64 2
@@ -33,5 +33,5 @@ entry:
   store double %sub25, ptr %arrayidx6, align 8
   %sub29 = fsub double %2, %sub22
   store double %sub29, ptr %arrayidx12, align 8
-  unreachable
+  ret void
 }

llvm/test/Transforms/SLPVectorizer/scalarization-overhead.ll

@@ -4,7 +4,7 @@
 
 ; Crash Test case reported on D134605
 
-define i16 @D134605() {
+define void @D134605() {
 ; CHECK-LABEL: @D134605(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[ARRAYIDX81:%.*]] = getelementptr inbounds [32 x i16], ptr poison, i16 0, i16 3
@@ -16,7 +16,7 @@ define i16 @D134605() {
 ; CHECK-NEXT:    [[OP_RDX:%.*]] = add i16 [[TMP3]], poison
 ; CHECK-NEXT:    [[REASS_MUL24:%.*]] = shl i16 [[OP_RDX]], 2
 ; CHECK-NEXT:    [[CALL:%.*]] = call i16 @check_i16(i16 noundef 1, i16 noundef [[REASS_MUL24]], i16 noundef 5120)
-; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    ret void
 ;
 entry:
   %arrayidx81 = getelementptr inbounds [32 x i16], ptr poison, i16 0, i16 3
@@ -38,7 +38,7 @@ entry:
   %add15935 = add i16 %add15534, poison
   %reass.mul24 = shl i16 %add15935, 2
   %call = call i16 @check_i16(i16 noundef 1, i16 noundef %reass.mul24, i16 noundef 5120)
-  unreachable
+  ret void
 }
 declare i16 @check_i16(i16, i16, i16)
 
@@ -53,7 +53,7 @@ define void @PR58054() {
 ; CHECK-NEXT:    [[VAL7:%.*]] = add i64 [[VAL]], [[VAL5]]
 ; CHECK-NEXT:    [[VAL8:%.*]] = sitofp i64 [[VAL7]] to double
 ; CHECK-NEXT:    call void @wibble(i32 poison, double [[VAL8]], i64 poison)
-; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    ret void
 ;
   %val = add i64 poison, poison
   %val2 = add i64 poison, poison
@@ -63,6 +63,6 @@ define void @PR58054() {
   %val7 = add i64 %val, %val5
   %val8 = sitofp i64 %val7 to double
   call void @wibble(i32 poison, double %val8, i64 poison)
-  unreachable
+  ret void
 }
 declare void @wibble(i32, double, i64)