[llvm] 72d53e1 - EarlyCSE: Add regression test for computeKnownFPClass phi handling

[Matt Arsenault via llvm-commits]

Author: Matt Arsenault
Date: 2023-05-18T12:49:20+01:00
New Revision: 72d53e109e487c98e13347f783f624c27d19210f

URL: https://github.com/llvm/llvm-project/commit/72d53e109e487c98e13347f783f624c27d19210f
DIFF: https://github.com/llvm/llvm-project/commit/72d53e109e487c98e13347f783f624c27d19210f.diff

LOG: EarlyCSE: Add regression test for computeKnownFPClass phi handling

This was reduced from the failure that caused the revert in
e13f88d1ff5234946af6349a9a7cf56fcb6c040e

Added: 
    llvm/test/Transforms/EarlyCSE/nofpclass-phi-regression.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/EarlyCSE/nofpclass-phi-regression.ll b/llvm/test/Transforms/EarlyCSE/nofpclass-phi-regression.ll
new file mode 100644
index 0000000000000..81cead29ac910
--- /dev/null
+++ b/llvm/test/Transforms/EarlyCSE/nofpclass-phi-regression.ll
@@ -0,0 +1,48 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt -S -passes=early-cse %s | FileCheck %s
+
+; Check for regression when phi support for computeKnownFPClass was
+; first committed.
+define void @compute_known_fpclass_phi_assert(i1 %cmp46, i1 %tobool51, ptr %a01) {
+; CHECK-LABEL: define void @compute_known_fpclass_phi_assert
+; CHECK-SAME: (i1 [[CMP46:%.*]], i1 [[TOBOOL51:%.*]], ptr [[A01:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_COND45:%.*]]
+; CHECK:       for.cond45:
+; CHECK-NEXT:    [[TMP0:%.*]] = phi double [ [[TMP1:%.*]], [[FOR_INC80:%.*]] ], [ 0.000000e+00, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br i1 [[CMP46]], label [[FOR_BODY48:%.*]], label [[FOR_END82:%.*]]
+; CHECK:       for.body48:
+; CHECK-NEXT:    br i1 [[TOBOOL51]], label [[FOR_INC80]], label [[IF_THEN52:%.*]]
+; CHECK:       if.then52:
+; CHECK-NEXT:    store double 0.000000e+00, ptr [[A01]], align 8
+; CHECK-NEXT:    br label [[FOR_INC80]]
+; CHECK:       for.inc80:
+; CHECK-NEXT:    [[TMP1]] = phi double [ 0.000000e+00, [[IF_THEN52]] ], [ [[TMP0]], [[FOR_BODY48]] ]
+; CHECK-NEXT:    br label [[FOR_COND45]]
+; CHECK:       for.end82:
+; CHECK-NEXT:    [[MUL84:%.*]] = fmul double [[TMP0]], 0.000000e+00
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %for.cond45
+
+for.cond45:                                       ; preds = %for.inc80, %entry
+  %0 = phi double [ %1, %for.inc80 ], [ 0.000000e+00, %entry ]
+  br i1 %cmp46, label %for.body48, label %for.end82
+
+for.body48:                                       ; preds = %for.cond45
+  br i1 %tobool51, label %for.inc80, label %if.then52
+
+if.then52:                                        ; preds = %for.body48
+  store double 0.000000e+00, ptr %a01, align 8
+  br label %for.inc80
+
+for.inc80:                                        ; preds = %if.then52, %for.body48
+  %1 = phi double [ 0.000000e+00, %if.then52 ], [ %0, %for.body48 ]
+  br label %for.cond45
+
+for.end82:                                        ; preds = %for.cond45
+  %mul84 = fmul double %0, 0.000000e+00
+  %neg = fneg double %mul84
+  ret void
+}