[llvm] 0ddfb80 - [ConstraintElim] Add tests with condition used in phi.

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2023-06-25T17:07:22+01:00
New Revision: 0ddfb802e4cab9782d0b6dda6916e0062493f0cf

URL: https://github.com/llvm/llvm-project/commit/0ddfb802e4cab9782d0b6dda6916e0062493f0cf
DIFF: https://github.com/llvm/llvm-project/commit/0ddfb802e4cab9782d0b6dda6916e0062493f0cf.diff

LOG: [ConstraintElim] Add tests with condition used in phi.

Add extra tests where conditions are used in phis for D153660.

Added: 
    llvm/test/Transforms/ConstraintElimination/cond-used-in-phi.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/ConstraintElimination/cond-used-in-phi.ll b/llvm/test/Transforms/ConstraintElimination/cond-used-in-phi.ll
new file mode 100644
index 0000000000000..8a2b86289b401
--- /dev/null
+++ b/llvm/test/Transforms/ConstraintElimination/cond-used-in-phi.ll
@@ -0,0 +1,139 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
+
+declare void @use(i1)
+
+define void @phi_loop_1(i8 %x) {
+; CHECK-LABEL: @phi_loop_1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[C_0:%.*]] = icmp uge i8 [[X:%.*]], 10
+; CHECK-NEXT:    br i1 [[C_0]], label [[LOOP:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[C_PHI:%.*]] = phi i1 [ false, [[ENTRY]] ], [ true, [[LOOP]] ]
+; CHECK-NEXT:    [[T_1:%.*]] = icmp uge i8 [[X]], 8
+; CHECK-NEXT:    call void @use(i1 true)
+; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
+; CHECK-NEXT:    [[EC:%.*]] = icmp ult i8 [[IV_NEXT]], 3
+; CHECK-NEXT:    br i1 [[EC]], label [[LOOP]], label [[LOOP_EXIT:%.*]]
+; CHECK:       loop.exit:
+; CHECK-NEXT:    call void @use(i1 [[C_PHI]])
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %c.0 = icmp uge i8 %x, 10
+  br i1 %c.0, label %loop, label %exit
+
+loop:
+  %iv = phi i8 [ 0, %entry ], [ %iv.next, %loop ]
+  %c.phi = phi i1 [ false, %entry ], [ %t.1, %loop ]
+  %t.1 = icmp uge i8 %x, 8
+  call void @use(i1 %t.1)
+  %iv.next = add i8 %iv, 1
+  %ec = icmp ult i8 %iv.next, 3
+  br i1 %ec, label %loop, label %loop.exit
+
+loop.exit:
+  call void @use(i1 %c.phi)
+  br label %exit
+
+exit:
+  ret void
+}
+
+define void @phi_loop_2(i8 %x) {
+; CHECK-LABEL: @phi_loop_2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[C_0:%.*]] = icmp uge i8 [[X:%.*]], 10
+; CHECK-NEXT:    br i1 [[C_0]], label [[LOOP_1_HEADER:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop.1.header:
+; CHECK-NEXT:    [[C_PHI:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ true, [[LOOP_1_LATCH:%.*]] ]
+; CHECK-NEXT:    br label [[LOOP_2:%.*]]
+; CHECK:       loop.2:
+; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ 0, [[LOOP_1_HEADER]] ], [ [[IV_NEXT:%.*]], [[LOOP_2]] ]
+; CHECK-NEXT:    [[T_1:%.*]] = icmp uge i8 [[X]], 8
+; CHECK-NEXT:    call void @use(i1 true)
+; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
+; CHECK-NEXT:    [[EC:%.*]] = icmp ult i8 [[IV_NEXT]], 3
+; CHECK-NEXT:    br i1 [[EC]], label [[LOOP_2]], label [[LOOP_1_LATCH]]
+; CHECK:       loop.1.latch:
+; CHECK-NEXT:    br i1 false, label [[LOOP_1_HEADER]], label [[LOOP_1_EXIT:%.*]]
+; CHECK:       loop.1.exit:
+; CHECK-NEXT:    call void @use(i1 [[C_PHI]])
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %c.0 = icmp uge i8 %x, 10
+  br i1 %c.0, label %loop.1.header, label %exit
+
+loop.1.header:
+  %c.phi = phi i1 [ false, %entry ], [ %t.1, %loop.1.latch ]
+  br label %loop.2
+
+loop.2:
+  %iv = phi i8 [ 0, %loop.1.header ], [ %iv.next, %loop.2 ]
+  %t.1 = icmp uge i8 %x, 8
+  call void @use(i1 %t.1)
+  %iv.next = add i8 %iv, 1
+  %ec = icmp ult i8 %iv.next, 3
+  br i1 %ec, label %loop.2, label %loop.1.latch
+
+loop.1.latch:
+  br i1 false, label %loop.1.header, label %loop.1.exit
+
+loop.1.exit:
+  call void @use(i1 %c.phi)
+  br label %exit
+
+exit:
+  ret void
+}
+
+define void @phi_loop_3(i8 %x, i1 %c) {
+; CHECK-LABEL: @phi_loop_3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[C_0:%.*]] = icmp uge i8 [[X:%.*]], 10
+; CHECK-NEXT:    br i1 [[C_0]], label [[LOOP:%.*]], label [[EXIT:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[C_PHI:%.*]] = phi i1 [ false, [[ENTRY]] ], [ true, [[LOOP_LATCH]] ]
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[LOOP_LATCH]], label [[LOOP_EXIT:%.*]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    [[T_1:%.*]] = icmp uge i8 [[X]], 8
+; CHECK-NEXT:    call void @use(i1 true)
+; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
+; CHECK-NEXT:    [[EC:%.*]] = icmp ult i8 [[IV_NEXT]], 3
+; CHECK-NEXT:    br i1 [[EC]], label [[LOOP]], label [[LOOP_EXIT]]
+; CHECK:       loop.exit:
+; CHECK-NEXT:    call void @use(i1 [[C_PHI]])
+; CHECK-NEXT:    br label [[EXIT]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %c.0 = icmp uge i8 %x, 10
+  br i1 %c.0, label %loop, label %exit
+
+loop:
+  %iv = phi i8 [ 0, %entry ], [ %iv.next, %loop.latch ]
+  %c.phi = phi i1 [ false, %entry ], [ %t.1, %loop.latch ]
+  br i1 %c, label %loop.latch, label %loop.exit
+
+loop.latch:
+  %t.1 = icmp uge i8 %x, 8
+  call void @use(i1 %t.1)
+  %iv.next = add i8 %iv, 1
+  %ec = icmp ult i8 %iv.next, 3
+  br i1 %ec, label %loop, label %loop.exit
+
+loop.exit:
+  call void @use(i1 %c.phi)
+  br label %exit
+
+exit:
+  ret void
+}