[AArch64][GlobalISel] Camp oversize v4s64 G_FPEXT operations.

Author: aemerson

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

@@ -421,8 +421,10 @@ AArch64LegalizerInfo::AArch64LegalizerInfo(const AArch64Subtarget &ST)
       .legalFor(
           {{s16, s32}, {s16, s64}, {s32, s64}, {v4s16, v4s32}, {v2s32, v2s64}})
       .clampMaxNumElements(0, s32, 2);
-  getActionDefinitionsBuilder(G_FPEXT).legalFor(
-      {{s32, s16}, {s64, s16}, {s64, s32}, {v4s32, v4s16}, {v2s64, v2s32}});
+  getActionDefinitionsBuilder(G_FPEXT)
+      .legalFor(
+          {{s32, s16}, {s64, s16}, {s64, s32}, {v4s32, v4s16}, {v2s64, v2s32}})
+      .clampMaxNumElements(0, s64, 2);
 
   // Conversions
   getActionDefinitionsBuilder({G_FPTOSI, G_FPTOUI})

llvm/test/CodeGen/AArch64/GlobalISel/legalize-fpext.mir

@@ -0,0 +1,41 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -march=aarch64 -run-pass=legalizer -global-isel-abort=1 %s -o - | FileCheck %s
+---
+name:            fpext_v4s64_v4s32
+tracksRegLiveness: true
+liveins:
+  - { reg: '$q0' }
+  - { reg: '$x0' }
+frameInfo:
+  maxAlignment:    1
+body:             |
+  bb.1:
+    liveins: $q0, $x0
+
+    ; CHECK-LABEL: name: fpext_v4s64_v4s32
+    ; CHECK: liveins: $q0, $x0
+    ; CHECK: [[COPY:%[0-9]+]]:_(<4 x s32>) = COPY $q0
+    ; CHECK: [[COPY1:%[0-9]+]]:_(p0) = COPY $x0
+    ; CHECK: [[UV:%[0-9]+]]:_(<2 x s32>), [[UV1:%[0-9]+]]:_(<2 x s32>) = G_UNMERGE_VALUES [[COPY]](<4 x s32>)
+    ; CHECK: [[FPEXT:%[0-9]+]]:_(<2 x s64>) = G_FPEXT [[UV]](<2 x s32>)
+    ; CHECK: [[FPEXT1:%[0-9]+]]:_(<2 x s64>) = G_FPEXT [[UV1]](<2 x s32>)
+    ; CHECK: [[UV2:%[0-9]+]]:_(s64), [[UV3:%[0-9]+]]:_(s64) = G_UNMERGE_VALUES [[FPEXT]](<2 x s64>)
+    ; CHECK: [[UV4:%[0-9]+]]:_(s64), [[UV5:%[0-9]+]]:_(s64) = G_UNMERGE_VALUES [[FPEXT1]](<2 x s64>)
+    ; CHECK: G_STORE [[UV2]](s64), [[COPY1]](p0) :: (store 8, align 32)
+    ; CHECK: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 8
+    ; CHECK: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY1]], [[C]](s64)
+    ; CHECK: G_STORE [[UV3]](s64), [[PTR_ADD]](p0) :: (store 8 + 8)
+    ; CHECK: [[C1:%[0-9]+]]:_(s64) = G_CONSTANT i64 16
+    ; CHECK: [[PTR_ADD1:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY1]], [[C1]](s64)
+    ; CHECK: G_STORE [[UV4]](s64), [[PTR_ADD1]](p0) :: (store 8 + 16, align 16)
+    ; CHECK: [[C2:%[0-9]+]]:_(s64) = G_CONSTANT i64 24
+    ; CHECK: [[PTR_ADD2:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY1]], [[C2]](s64)
+    ; CHECK: G_STORE [[UV5]](s64), [[PTR_ADD2]](p0) :: (store 8 + 24)
+    ; CHECK: RET_ReallyLR
+    %0:_(<4 x s32>) = COPY $q0
+    %1:_(p0) = COPY $x0
+    %2:_(<4 x s64>) = G_FPEXT %0(<4 x s32>)
+    G_STORE %2(<4 x s64>), %1(p0) :: (store 32)
+    RET_ReallyLR
+
+...