[llvm] db39ef9 - [GVN] Add additional tests for inverted condition propagation (NFC)

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2025-10-02T14:35:14+02:00
New Revision: db39ef9d566529000a1edcd58108f2df7b323bf5

URL: https://github.com/llvm/llvm-project/commit/db39ef9d566529000a1edcd58108f2df7b323bf5
DIFF: https://github.com/llvm/llvm-project/commit/db39ef9d566529000a1edcd58108f2df7b323bf5.diff

LOG: [GVN] Add additional tests for inverted condition propagation (NFC)

Added: 
    

Modified: 
    llvm/test/Transforms/GVN/condprop.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/GVN/condprop.ll b/llvm/test/Transforms/GVN/condprop.ll
index 15ffcbff1e157..eb2a9f1e847c4 100644
--- a/llvm/test/Transforms/GVN/condprop.ll
+++ b/llvm/test/Transforms/GVN/condprop.ll
@@ -321,6 +321,66 @@ 
diff erent:
   ret i1 %cmp3
 }
 
+define i1 @test6_phi1(i1 %c, i32 %x, i32 %y) {
+; CHECK-LABEL: @test6_phi1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP_NOT:%.*]] = icmp ne i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[X]], [[Y]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[BB2]], label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[PHI:%.*]] = phi i1 [ false, [[BB1]] ], [ true, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    ret i1 [[PHI]]
+; CHECK:       bb3:
+; CHECK-NEXT:    ret i1 false
+;
+entry:
+  %cmp.not = icmp ne i32 %x, %y
+  br i1 %c, label %bb1, label %bb2
+
+bb1:
+  %cmp = icmp eq i32 %x, %y
+  br i1 %cmp, label %bb2, label %bb3
+
+bb2:
+  %phi = phi i1 [ %cmp.not, %bb1 ], [ true, %entry ]
+  ret i1 %phi
+
+bb3:
+  ret i1 false
+}
+
+define i1 @test6_phi2(i1 %c, i32 %x, i32 %y) {
+; CHECK-LABEL: @test6_phi2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    [[CMP_NOT:%.*]] = icmp ne i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[X]], [[Y]]
+; CHECK-NEXT:    br i1 [[CMP]], label [[BB2]], label [[BB3:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    [[PHI:%.*]] = phi i1 [ [[CMP_NOT]], [[BB1]] ], [ true, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    ret i1 [[PHI]]
+; CHECK:       bb3:
+; CHECK-NEXT:    ret i1 false
+;
+entry:
+  br i1 %c, label %bb1, label %bb2
+
+bb1:
+  %cmp.not = icmp ne i32 %x, %y
+  %cmp = icmp eq i32 %x, %y
+  br i1 %cmp, label %bb2, label %bb3
+
+bb2:
+  %phi = phi i1 [ %cmp.not, %bb1 ], [ true, %entry ]
+  ret i1 %phi
+
+bb3:
+  ret i1 false
+}
+
 define i1 @test7(i32 %x, i32 %y) {
 ; CHECK-LABEL: @test7(
 ; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]