[AArc64][GlobalISel] Fix legalizer assert for G_INSERT_VECTOR_ELT

We should moreElements <3 x s1> to <4 x s1> before we try to widen the element,
otherwise we end up with a <3 x s21> nonsense type.

(cherry picked from commit a01e9ce)

Test has been changed from original commit due to a fallback in a G_BITCAST.
Added abort=2 so we can see partial legalization and check no crash.

llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp

@@ -877,6 +877,7 @@ AArch64LegalizerInfo::AArch64LegalizerInfo(const AArch64Subtarget &ST)
 
   getActionDefinitionsBuilder(G_INSERT_VECTOR_ELT)
       .legalIf(typeInSet(0, {v16s8, v8s8, v8s16, v4s16, v4s32, v2s32, v2s64}))
+      .moreElementsToNextPow2(0)
       .widenVectorEltsToVectorMinSize(0, 64);
 
   getActionDefinitionsBuilder(G_BUILD_VECTOR)

llvm/test/CodeGen/AArch64/GlobalISel/legalize-insert-vector-elt.mir

@@ -1,5 +1,5 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
-# RUN: llc -mtriple=aarch64-linux-gnu -O0 -run-pass=legalizer %s -o - -global-isel-abort=1 | FileCheck %s
+# RUN: llc -mtriple=aarch64-linux-gnu -O0 -run-pass=legalizer %s -o - -global-isel-abort=2 | FileCheck %s
 ---
 name:            pr63826_v2s16
 body:             |
@@ -216,3 +216,70 @@ body: |
     $q0 = COPY %2(<2 x s64>)
     RET_ReallyLR
 ...
+---
+name:            v3s8_crash
+body:             |
+  ; CHECK-LABEL: name: v3s8_crash
+  ; CHECK: bb.0:
+  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
+  ; CHECK-NEXT:   liveins: $w1, $w2, $w3, $x0
+  ; CHECK-NEXT: {{  $}}
+  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:_(p0) = COPY $x0
+  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(s32) = COPY $w1
+  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:_(s32) = COPY $w2
+  ; CHECK-NEXT:   [[COPY3:%[0-9]+]]:_(s32) = COPY $w3
+  ; CHECK-NEXT:   [[BUILD_VECTOR:%[0-9]+]]:_(<3 x s32>) = G_BUILD_VECTOR [[COPY1]](s32), [[COPY2]](s32), [[COPY3]](s32)
+  ; CHECK-NEXT:   [[TRUNC:%[0-9]+]]:_(<3 x s8>) = G_TRUNC [[BUILD_VECTOR]](<3 x s32>)
+  ; CHECK-NEXT:   [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 0
+  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(s8) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[C1:%[0-9]+]]:_(s8) = G_CONSTANT i8 0
+  ; CHECK-NEXT:   [[BUILD_VECTOR1:%[0-9]+]]:_(<3 x s8>) = G_BUILD_VECTOR [[C1]](s8), [[DEF]](s8), [[DEF]](s8)
+  ; CHECK-NEXT: {{  $}}
+  ; CHECK-NEXT: bb.1:
+  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
+  ; CHECK-NEXT: {{  $}}
+  ; CHECK-NEXT:   [[C2:%[0-9]+]]:_(s64) = G_CONSTANT i64 0
+  ; CHECK-NEXT:   [[C3:%[0-9]+]]:_(s8) = G_CONSTANT i8 0
+  ; CHECK-NEXT:   [[IVEC:%[0-9]+]]:_(<3 x s8>) = G_INSERT_VECTOR_ELT [[TRUNC]], [[C3]](s8), [[C2]](s64)
+  ; CHECK-NEXT:   [[SHUF:%[0-9]+]]:_(<12 x s8>) = G_SHUFFLE_VECTOR [[IVEC]](<3 x s8>), [[BUILD_VECTOR1]], shufflemask(0, 3, 3, 3, 1, 3, 3, 3, 2, 3, 3, 3)
+  ; CHECK-NEXT:   [[BITCAST:%[0-9]+]]:_(<3 x s32>) = G_BITCAST [[SHUF]](<12 x s8>)
+  ; CHECK-NEXT:   [[UV:%[0-9]+]]:_(s32), [[UV1:%[0-9]+]]:_(s32), [[UV2:%[0-9]+]]:_(s32) = G_UNMERGE_VALUES [[BITCAST]](<3 x s32>)
+  ; CHECK-NEXT:   [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[BUILD_VECTOR2:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[UV]](s32), [[UV1]](s32), [[UV2]](s32), [[DEF1]](s32)
+  ; CHECK-NEXT:   [[UITOFP:%[0-9]+]]:_(<4 x s32>) = G_UITOFP [[BUILD_VECTOR2]](<4 x s32>)
+  ; CHECK-NEXT:   [[UV3:%[0-9]+]]:_(s32), [[UV4:%[0-9]+]]:_(s32), [[UV5:%[0-9]+]]:_(s32), [[UV6:%[0-9]+]]:_(s32) = G_UNMERGE_VALUES [[UITOFP]](<4 x s32>)
+  ; CHECK-NEXT:   [[BUILD_VECTOR3:%[0-9]+]]:_(<3 x s32>) = G_BUILD_VECTOR [[UV3]](s32), [[UV4]](s32), [[UV5]](s32)
+  ; CHECK-NEXT:   [[UV7:%[0-9]+]]:_(s32), [[UV8:%[0-9]+]]:_(s32), [[UV9:%[0-9]+]]:_(s32) = G_UNMERGE_VALUES [[BUILD_VECTOR3]](<3 x s32>)
+  ; CHECK-NEXT:   G_STORE [[UV7]](s32), [[COPY]](p0) :: (store (s32), align 16)
+  ; CHECK-NEXT:   [[C4:%[0-9]+]]:_(s64) = G_CONSTANT i64 4
+  ; CHECK-NEXT:   [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C4]](s64)
+  ; CHECK-NEXT:   G_STORE [[UV8]](s32), [[PTR_ADD]](p0) :: (store (s32) into unknown-address + 4)
+  ; CHECK-NEXT:   [[C5:%[0-9]+]]:_(s64) = G_CONSTANT i64 8
+  ; CHECK-NEXT:   [[PTR_ADD1:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C5]](s64)
+  ; CHECK-NEXT:   G_STORE [[UV9]](s32), [[PTR_ADD1]](p0) :: (store (s32) into unknown-address + 8, align 8)
+  ; CHECK-NEXT:   G_BR %bb.1
+  bb.1:
+    liveins: $w1, $w2, $w3, $x0
+
+    %0:_(p0) = COPY $x0
+    %2:_(s32) = COPY $w1
+    %3:_(s32) = COPY $w2
+    %4:_(s32) = COPY $w3
+    %5:_(<3 x s32>) = G_BUILD_VECTOR %2(s32), %3(s32), %4(s32)
+    %1:_(<3 x s8>) = G_TRUNC %5(<3 x s32>)
+    %8:_(s64) = G_CONSTANT i64 0
+    %11:_(s8) = G_IMPLICIT_DEF
+    %7:_(s8) = G_CONSTANT i8 0
+    %10:_(<3 x s8>) = G_BUILD_VECTOR %7(s8), %11(s8), %11(s8)
+
+  bb.2:
+    %14:_(s64) = G_CONSTANT i64 0
+    %15:_(s8) = G_CONSTANT i8 0
+    %6:_(<3 x s8>) = G_INSERT_VECTOR_ELT %1, %15(s8), %14(s64)
+    %9:_(<12 x s8>) = G_SHUFFLE_VECTOR %6(<3 x s8>), %10, shufflemask(0, 3, 3, 3, 1, 3, 3, 3, 2, 3, 3, 3)
+    %12:_(<3 x s32>) = G_BITCAST %9(<12 x s8>)
+    %13:_(<3 x s32>) = G_UITOFP %12(<3 x s32>)
+    G_STORE %13(<3 x s32>), %0(p0) :: (store (<3 x s32>))
+    G_BR %bb.2
+
+...