[PassManager] add tests for vector pass enabling; NFC

Author: rotateright

llvm/test/Other/opt-pipeline-vector-passes.ll

@@ -0,0 +1,52 @@
+; RUN: opt -O1                    -debug-pass=Structure  < %s -o /dev/null 2>&1 | FileCheck %s --check-prefixes=OLDPM_O1
+; RUN: opt -O2                    -debug-pass=Structure  < %s -o /dev/null 2>&1 | FileCheck %s --check-prefixes=OLDPM_O2
+; RUN: opt -O1 -vectorize-loops=0 -debug-pass=Structure  < %s -o /dev/null 2>&1 | FileCheck %s --check-prefixes=OLDPM_O1_FORCE_OFF
+; RUN: opt -O2 -vectorize-loops=0 -debug-pass=Structure  < %s -o /dev/null 2>&1 | FileCheck %s --check-prefixes=OLDPM_O2_FORCE_OFF
+; RUN: opt -disable-verify -debug-pass-manager -passes='default<O1>' -S %s 2>&1 | FileCheck %s --check-prefixes=NEWPM_O1
+; RUN: opt -disable-verify -debug-pass-manager -passes='default<O2>' -S %s 2>&1 | FileCheck %s --check-prefixes=NEWPM_O2
+
+; REQUIRES: asserts
+
+; SLP does not run at -O1. Loop vectorization runs, but it only
+; works on loops explicitly annotated with pragmas.
+
+; OLDPM_O1-LABEL:  Pass Arguments:
+; OLDPM_O1:        Loop Vectorization
+; OLDPM_O1:        Optimize scalar/vector ops
+; OLDPM_O1-NOT:    SLP Vectorizer
+
+; Everything runs at -O2.
+
+; OLDPM_O2-LABEL:  Pass Arguments:
+; OLDPM_O2:        Loop Vectorization
+; OLDPM_O2:        Optimize scalar/vector ops
+; OLDPM_O2:        SLP Vectorizer
+
+; The loop vectorizer still runs at both -O1/-O2 even with the
+; debug flag, but it only works on loops explicitly annotated
+; with pragmas.
+
+; OLDPM_O1_FORCE_OFF-LABEL:  Pass Arguments:
+; OLDPM_O1_FORCE_OFF:        Loop Vectorization
+; OLDPM_O1_FORCE_OFF:        Optimize scalar/vector ops
+; OLDPM_O1_FORCE_OFF-NOT:    SLP Vectorizer
+
+; OLDPM_O2_FORCE_OFF-LABEL:  Pass Arguments:
+; OLDPM_O2_FORCE_OFF:        Loop Vectorization
+; OLDPM_O2_FORCE_OFF:        Optimize scalar/vector ops
+; OLDPM_O2_FORCE_OFF:        SLP Vectorizer
+
+; There should be no difference with the new pass manager.
+; This is tested more thoroughly in other test files.
+
+; NEWPM_O1-LABEL:  Running pass: LoopVectorizePass
+; NEWPM_O1:        Running pass: VectorCombinePass
+; NEWPM_O1-NOT:    Running pass: SLPVectorizerPass
+
+; NEWPM_O2-LABEL:  Running pass: LoopVectorizePass
+; NEWPM_O2:        Running pass: VectorCombinePass
+; NEWPM_O2:        Running pass: SLPVectorizerPass
+
+define void @f() {
+  ret void
+}