[llvm] r339219 - [NFC] Add some tests on mustexec

[Max Kazantsev via llvm-commits]

Author: mkazantsev
Date: Tue Aug  7 21:40:47 2018
New Revision: 339219

URL: http://llvm.org/viewvc/llvm-project?rev=339219&view=rev
Log:
[NFC] Add some tests on mustexec

Modified:
    llvm/trunk/test/Transforms/LICM/hoist-mustexec.ll

Modified: llvm/trunk/test/Transforms/LICM/hoist-mustexec.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LICM/hoist-mustexec.ll?rev=339219&r1=339218&r2=339219&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/LICM/hoist-mustexec.ll (original)
+++ llvm/trunk/test/Transforms/LICM/hoist-mustexec.ll Tue Aug  7 21:40:47 2018
@@ -280,3 +280,152 @@ fail:
   call void @f()
   ret i32 -1
 }
+
+declare void @may_throw() inaccessiblememonly
+
+; Test that we can sink a mustexecute load from loop header even in presence of
+; throwing instructions after it.
+define void @test_hoist_from_header_01(i32* %p, i32 %n) {
+
+; CHECK-LABEL: @test_hoist_from_header_01(
+; CHECK:       entry:
+; CHECK-NEXT:  %load = load i32, i32* %p
+; CHECK-NOT:   load i32
+
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
+  %dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
+  %load = load i32, i32* %p
+  call void @may_throw()
+  %cond = icmp slt i32 %iv, %n
+  br i1 %cond, label %if.true, label %if.false
+
+if.true:
+  %a = add i32 %iv, %iv
+  br label %backedge
+
+if.false:
+  %b = mul i32 %iv, %iv
+  br label %backedge
+
+backedge:
+  %merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
+  %iv.next = add i32 %iv, %merge
+  %loop.cond = icmp ult i32 %iv.next, %load
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret void
+}
+
+define void @test_hoist_from_header_02(i32* %p, i32 %n) {
+
+; CHECK-LABEL: @test_hoist_from_header_02(
+; CHECK:       entry:
+; CHECK-NEXT:  %load = load i32, i32* %p
+; CHECK-NOT:   load i32
+
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
+  %dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
+  %load = load i32, i32* %p
+  %cond = icmp slt i32 %iv, %n
+  br i1 %cond, label %if.true, label %if.false
+
+if.true:
+  call void @may_throw()
+  %a = add i32 %iv, %iv
+  br label %backedge
+
+if.false:
+  %b = mul i32 %iv, %iv
+  br label %backedge
+
+backedge:
+  %merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
+  %iv.next = add i32 %iv, %merge
+  %loop.cond = icmp ult i32 %iv.next, %load
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret void
+}
+
+define void @test_hoist_from_header_03(i32* %p, i32 %n) {
+
+; CHECK-LABEL: @test_hoist_from_header_03(
+; CHECK:       entry:
+; CHECK-NEXT:  %load = load i32, i32* %p
+; CHECK-NOT:   load i32
+
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
+  %dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
+  %load = load i32, i32* %p
+  %cond = icmp slt i32 %iv, %n
+  br i1 %cond, label %if.true, label %if.false
+
+if.true:
+  %a = add i32 %iv, %iv
+  br label %backedge
+
+if.false:
+  %b = mul i32 %iv, %iv
+  br label %backedge
+
+backedge:
+  %merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
+  call void @may_throw()
+  %iv.next = add i32 %iv, %merge
+  %loop.cond = icmp ult i32 %iv.next, %load
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret void
+}
+
+; Check that a throwing instruction prohibits hoisting across it.
+define void @test_hoist_from_header_04(i32* %p, i32 %n) {
+
+; CHECK-LABEL: @test_hoist_from_header_04(
+; CHECK:       entry:
+; CHECK:       loop:
+; CHECK:       %load = load i32, i32* %p
+
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
+  %dummy = phi i32 [ 0, %entry ], [ %merge, %backedge ]
+  call void @may_throw()
+  %load = load i32, i32* %p
+  %cond = icmp slt i32 %iv, %n
+  br i1 %cond, label %if.true, label %if.false
+
+if.true:
+  %a = add i32 %iv, %iv
+  br label %backedge
+
+if.false:
+  %b = mul i32 %iv, %iv
+  br label %backedge
+
+backedge:
+  %merge = phi i32 [ %a, %if.true ], [ %b, %if.false ]
+  %iv.next = add i32 %iv, %merge
+  %loop.cond = icmp ult i32 %iv.next, %load
+  br i1 %loop.cond, label %loop, label %exit
+
+exit:
+  ret void
+}