[SLP][AArch64] Add a test case for SLP phi ordering of scalable vectors. NFC

Author: davemgreen

llvm/test/Transforms/SLPVectorizer/AArch64/phi-use-order-scalable.ll

@@ -0,0 +1,78 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=slp-vectorizer -S < %s | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-arm-none-eabi"
+
+define <vscale x 8 x i32> @scalable(i1 %c, i32 %srcALen, i32 %srcBLen) {
+; CHECK-LABEL: @scalable(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    br label [[IF_END12:%.*]]
+; CHECK:       if.else:
+; CHECK-NEXT:    br label [[IF_END12]]
+; CHECK:       if.end12:
+; CHECK-NEXT:    [[SRCALEN_ADDR_0:%.*]] = phi i32 [ [[SRCALEN:%.*]], [[IF_THEN]] ], [ [[SRCBLEN:%.*]], [[IF_ELSE]] ]
+; CHECK-NEXT:    [[SRCBLEN_ADDR_0:%.*]] = phi i32 [ [[SRCBLEN]], [[IF_THEN]] ], [ [[SRCALEN]], [[IF_ELSE]] ]
+; CHECK-NEXT:    [[BROADCAST_SPLATINSERT78:%.*]] = insertelement <vscale x 8 x i32> poison, i32 [[SRCBLEN_ADDR_0]], i64 0
+; CHECK-NEXT:    [[BROADCAST_SPLATINSERT82:%.*]] = insertelement <vscale x 8 x i32> poison, i32 [[SRCALEN_ADDR_0]], i64 0
+; CHECK-NEXT:    [[BROADCAST_SPLAT83:%.*]] = shufflevector <vscale x 8 x i32> [[BROADCAST_SPLATINSERT82]], <vscale x 8 x i32> poison, <vscale x 8 x i32> zeroinitializer
+; CHECK-NEXT:    ret <vscale x 8 x i32> [[BROADCAST_SPLAT83]]
+;
+entry:
+  br i1 %c, label %if.then, label %if.else
+
+if.then:                                          ; preds = %entry
+  br label %if.end12
+
+if.else:                                          ; preds = %entry
+  br label %if.end12
+
+if.end12:                                         ; preds = %if.else, %if.then
+  %srcALen.addr.0 = phi i32 [ %srcALen, %if.then ], [ %srcBLen, %if.else ]
+  %srcBLen.addr.0 = phi i32 [ %srcBLen, %if.then ], [ %srcALen, %if.else ]
+  %broadcast.splatinsert78 = insertelement <vscale x 8 x i32> poison, i32 %srcBLen.addr.0, i64 0
+  %broadcast.splatinsert82 = insertelement <vscale x 8 x i32> poison, i32 %srcALen.addr.0, i64 0
+  %broadcast.splat83 = shufflevector <vscale x 8 x i32> %broadcast.splatinsert82, <vscale x 8 x i32> poison, <vscale x 8 x i32> zeroinitializer
+  ret <vscale x 8 x i32> %broadcast.splat83
+}
+
+define <vscale x 8 x i32> @multiuse(i1 %c, i32 %srcALen, i32 %srcBLen) {
+; CHECK-LABEL: @multiuse(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    br label [[IF_END12:%.*]]
+; CHECK:       if.else:
+; CHECK-NEXT:    br label [[IF_END12]]
+; CHECK:       if.end12:
+; CHECK-NEXT:    [[SRCALEN_ADDR_0:%.*]] = phi i32 [ [[SRCALEN:%.*]], [[IF_THEN]] ], [ [[SRCBLEN:%.*]], [[IF_ELSE]] ]
+; CHECK-NEXT:    [[SRCBLEN_ADDR_0:%.*]] = phi i32 [ [[SRCBLEN]], [[IF_THEN]] ], [ [[SRCALEN]], [[IF_ELSE]] ]
+; CHECK-NEXT:    [[BROADCAST_SPLATINSERT78:%.*]] = insertelement <vscale x 8 x i32> poison, i32 [[SRCBLEN_ADDR_0]], i64 0
+; CHECK-NEXT:    [[BROADCAST_SPLATINSERT82:%.*]] = insertelement <vscale x 8 x i32> poison, i32 [[SRCALEN_ADDR_0]], i64 0
+; CHECK-NEXT:    [[BROADCAST_SPLAT83:%.*]] = shufflevector <vscale x 8 x i32> [[BROADCAST_SPLATINSERT82]], <vscale x 8 x i32> poison, <vscale x 8 x i32> zeroinitializer
+; CHECK-NEXT:    [[X:%.*]] = add i32 [[SRCALEN_ADDR_0]], [[SRCBLEN_ADDR_0]]
+; CHECK-NEXT:    [[BROADCAST_SPLAT84:%.*]] = insertelement <vscale x 8 x i32> [[BROADCAST_SPLAT83]], i32 [[SRCBLEN_ADDR_0]], i64 1
+; CHECK-NEXT:    ret <vscale x 8 x i32> [[BROADCAST_SPLAT84]]
+;
+entry:
+  br i1 %c, label %if.then, label %if.else
+
+if.then:                                          ; preds = %entry
+  br label %if.end12
+
+if.else:                                          ; preds = %entry
+  br label %if.end12
+
+if.end12:                                         ; preds = %if.else, %if.then
+  %srcALen.addr.0 = phi i32 [ %srcALen, %if.then ], [ %srcBLen, %if.else ]
+  %srcBLen.addr.0 = phi i32 [ %srcBLen, %if.then ], [ %srcALen, %if.else ]
+  %broadcast.splatinsert78 = insertelement <vscale x 8 x i32> poison, i32 %srcBLen.addr.0, i64 0
+  %broadcast.splatinsert82 = insertelement <vscale x 8 x i32> poison, i32 %srcALen.addr.0, i64 0
+  %broadcast.splat83 = shufflevector <vscale x 8 x i32> %broadcast.splatinsert82, <vscale x 8 x i32> poison, <vscale x 8 x i32> zeroinitializer
+  %x = add i32 %srcALen.addr.0, %srcBLen.addr.0
+  %broadcast.splat84 = insertelement <vscale x 8 x i32> %broadcast.splat83, i32 %srcBLen.addr.0, i64 1
+  ret <vscale x 8 x i32> %broadcast.splat84
+}
+