[llvm] r292261 - Add a test case for LICM when promoting locals that may be read after the throw within the loop. NFCI.
Xin Tong via llvm-commits
llvm-commits at lists.llvm.org
Tue Jan 17 13:26:36 PST 2017
Author: trentxintong
Date: Tue Jan 17 15:26:36 2017
New Revision: 292261
URL: http://llvm.org/viewvc/llvm-project?rev=292261&view=rev
Log:
Add a test case for LICM when promoting locals that may be read after the throw within the loop. NFCI.
Summary: Add a test case for LICM when promoting locals that may be read after the throw within the loop.
Reviewers: eli.friedman, hfinkel, sanjoy
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D28822
Modified:
llvm/trunk/test/Transforms/LICM/scalar-promote-unwind.ll
Modified: llvm/trunk/test/Transforms/LICM/scalar-promote-unwind.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LICM/scalar-promote-unwind.ll?rev=292261&r1=292260&r2=292261&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/LICM/scalar-promote-unwind.ll (original)
+++ llvm/trunk/test/Transforms/LICM/scalar-promote-unwind.ll Tue Jan 17 15:26:36 2017
@@ -69,4 +69,82 @@ for.cond.cleanup:
ret void
}
+ at _ZTIi = external constant i8*
+
+; In this test, the loop is within a try block. There is an explicit unwind edge out of the loop.
+; Make sure this edge is treated as a loop exit, and that the loads and stores are promoted as
+; expected
+define void @loop_within_tryblock() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+ %a = alloca i32, align 4
+ store i32 0, i32* %a, align 4
+ br label %for.cond
+
+for.cond:
+ %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
+ %cmp = icmp slt i32 %i.0, 1024
+ br i1 %cmp, label %for.body, label %for.end
+
+; CHECK: for.body:
+; CHECK-NOT: load
+; CHECK-NOT: store
+; CHECK: invoke
+for.body:
+ %0 = load i32, i32* %a, align 4
+ %add = add nsw i32 %0, 1
+ store i32 %add, i32* %a, align 4
+ invoke void @boo()
+ to label %invoke.cont unwind label %lpad
+
+invoke.cont:
+ br label %for.inc
+
+for.inc:
+ %inc = add nsw i32 %i.0, 1
+ br label %for.cond
+
+; CHECK: lpad:
+; CHECK: store
+; CHECK: br
+lpad:
+ %1 = landingpad { i8*, i32 }
+ catch i8* bitcast (i8** @_ZTIi to i8*)
+ %2 = extractvalue { i8*, i32 } %1, 0
+ %3 = extractvalue { i8*, i32 } %1, 1
+ br label %catch.dispatch
+
+catch.dispatch:
+ %4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) #3
+ %matches = icmp eq i32 %3, %4
+ br i1 %matches, label %catch, label %eh.resume
+
+catch:
+ %5 = call i8* @__cxa_begin_catch(i8* %2) #3
+ %6 = bitcast i8* %5 to i32*
+ %7 = load i32, i32* %6, align 4
+ call void @__cxa_end_catch() #3
+ br label %try.cont
+
+try.cont:
+ ret void
+
+for.end:
+ br label %try.cont
+
+eh.resume:
+ %lpad.val = insertvalue { i8*, i32 } undef, i8* %2, 0
+ %lpad.val3 = insertvalue { i8*, i32 } %lpad.val, i32 %3, 1
+ resume { i8*, i32 } %lpad.val3
+}
+
+declare void @boo()
+
+declare i32 @__gxx_personality_v0(...)
+
+declare i32 @llvm.eh.typeid.for(i8*)
+
+declare i8* @__cxa_begin_catch(i8*)
+
+declare void @__cxa_end_catch()
+
declare void @f() uwtable
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