[PATCH] D155726: [InstCombine] Test case for D155718+D154064

[Dhruv Chawla via Phabricator via llvm-commits]

0xdc03 updated this revision to Diff 542365.
0xdc03 added a comment.

- Address reviewer comments
  - Better test
- Invert the patch stack


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155726/new/

https://reviews.llvm.org/D155726

Files:
  llvm/test/Transforms/InstCombine/icmp-fold-into-phi.ll


Index: llvm/test/Transforms/InstCombine/icmp-fold-into-phi.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/InstCombine/icmp-fold-into-phi.ll
@@ -0,0 +1,85 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt < %s -passes=instcombine -S | FileCheck %s
+
+define i1 @SwitchTest(i32 %x, i32 %y) {
+; CHECK-LABEL: define i1 @SwitchTest
+; CHECK-SAME: (i32 [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    switch i32 [[X]], label [[BB1:%.*]] [
+; CHECK-NEXT:    i32 0, label [[BB2:%.*]]
+; CHECK-NEXT:    i32 1, label [[BB3:%.*]]
+; CHECK-NEXT:    ]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp ugt i32 [[Y]], 1
+; CHECK-NEXT:    br label [[BB2]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[PHI1:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[TMP0]], [[BB1]] ]
+; CHECK-NEXT:    br label [[BB3]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[PHI2:%.*]] = phi i1 [ [[PHI1]], [[BB2]] ], [ false, [[ENTRY]] ]
+; CHECK-NEXT:    ret i1 [[PHI2]]
+;
+entry:
+  switch i32 %x, label %bb1 [
+  i32 0, label %bb2
+  i32 1, label %bb3
+  ]
+
+bb1:
+  br label %bb2
+
+bb2:
+  %phi1 = phi i32 [ 1, %entry ], [ %y, %bb1 ]
+  br label %bb3
+
+bb3:
+  %phi2 = phi i32 [ %phi1, %bb2 ], [ 0, %entry ]
+  %cmp = icmp ugt i32 %phi2, 1
+  ret i1 %cmp
+}
+
+; Test case derived from:
+; llvm-test-suite/MultiSource/Benchmarks/MiBench/consumer-typeset/z10.c
+define i1 @BranchTest(i1 %c, i1 %c1, i1 %c2, i1 %c3, i1 %c4) {
+; CHECK-LABEL: define i1 @BranchTest
+; CHECK-SAME: (i1 [[C:%.*]], i1 [[C1:%.*]], i1 [[C2:%.*]], i1 [[C3:%.*]], i1 [[C4:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C]], label [[SW_EPILOG:%.*]], label [[COND_FALSE:%.*]]
+; CHECK:       cond.false:
+; CHECK-NEXT:    br i1 [[C1]], label [[SW_EPILOG]], label [[COND_FALSE2:%.*]]
+; CHECK:       cond.false2:
+; CHECK-NEXT:    br i1 [[C2]], label [[SW_EPILOG]], label [[COND_FALSE3:%.*]]
+; CHECK:       cond.false3:
+; CHECK-NEXT:    br i1 [[C3]], label [[SW_BB:%.*]], label [[COND_END:%.*]]
+; CHECK:       cond.end:
+; CHECK-NEXT:    br label [[SW_BB]]
+; CHECK:       sw.bb:
+; CHECK-NEXT:    br label [[SW_EPILOG]]
+; CHECK:       sw.epilog:
+; CHECK-NEXT:    ret i1 [[C]]
+;
+entry:
+  br i1 %c, label %sw.epilog, label %cond.false
+
+cond.false:
+  br i1 %c1, label %sw.epilog, label %cond.false2
+
+cond.false2:
+  br i1 %c2, label %sw.epilog, label %cond.false3
+
+cond.false3:
+  br i1 %c3, label %sw.bb, label %cond.end
+
+cond.end:
+  %cond = select i1 %c4, i32 127, i32 126
+  br label %sw.bb
+
+sw.bb:
+  %cond2 = phi i32 [ %cond, %cond.end ], [ 128, %cond.false3 ]
+  br label %sw.epilog
+
+sw.epilog:
+  %cond3 = phi i32 [ %cond2, %sw.bb ], [ 134, %cond.false2 ], [ 2, %cond.false ], [ 1, %entry ]
+  %cmp  = icmp ult i32 %cond3, 2
+  ret i1 %cmp
+}


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