[PATCH] D69257: Outline non returning functions unless a longjmp

[Ruijie Fang via Phabricator via llvm-commits]

rjf updated this revision to Diff 281804.
rjf added a comment.

Add testcase for longjmp.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69257/new/

https://reviews.llvm.org/D69257

Files:
  llvm/test/Transforms/HotColdSplit/outline-unless-longjmp.ll


Index: llvm/test/Transforms/HotColdSplit/outline-unless-longjmp.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/HotColdSplit/outline-unless-longjmp.ll
@@ -0,0 +1,66 @@
+; REQUIRES: asserts
+; RUN: opt -S -hotcoldsplit -debug < %s 2>&1 | FileCheck %s
+; RUN: opt -hotcoldsplit %s -o /dev/null
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+%"class.std::ios_base::Init" = type { i8 }
+%struct.__jmp_buf_tag = type { [8 x i64], i32, %struct.__sigset_t }
+%struct.__sigset_t = type { [16 x i64] }
+
+ at jbuf = dso_local global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16
+
+; CHECK: @f
+; CHECK-NOT: {{.*}}@f.cold.1
+
+
+declare dso_local i32 @__cxa_atexit(void (i8*)*, i8*, i8*) #3
+
+define dso_local void @_Z1ai(i32 %i) #4 {
+entry:
+  %i.addr = alloca i32, align 4
+  store i32 %i, i32* %i.addr, align 4
+  %0 = load i32, i32* %i.addr, align 4
+  %add = add nsw i32 %0, 1
+  call void @longjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @jbuf, i64 0, i64 0), i32 %add) #8
+  unreachable
+}
+
+declare dso_local void @longjmp(%struct.__jmp_buf_tag*, i32) #5
+
+define dso_local i32 @f() #6 {
+entry:
+  %retval = alloca i32, align 4
+  %i = alloca i32, align 4
+  store i32 0, i32* %retval, align 4
+  store volatile i32 0, i32* %i, align 4
+  %call = call i32 @_setjmp(%struct.__jmp_buf_tag* getelementptr inbounds ([1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* @jbuf, i64 0, i64 0)) #9
+  %cmp = icmp ne i32 %call, 3
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %0 = load volatile i32, i32* %i, align 4
+  %inc = add nsw i32 %0, 1
+  store volatile i32 %inc, i32* %i, align 4
+  call void @_Z1ai(i32 %0) #10
+  unreachable
+
+if.end:                                           ; preds = %entry
+  ret i32 0
+}
+
+; Function Attrs: nounwind returns_twice
+declare dso_local i32 @_setjmp(%struct.__jmp_buf_tag*) #7
+
+
+attributes #3 = { nounwind }
+attributes #4 = { noinline noreturn nounwind uwtable }
+attributes #5 = { noreturn nounwind }
+attributes #6 = { noinline norecurse nounwind uwtable }
+attributes #7 = { nounwind returns_twice }
+attributes #8 = { noreturn nounwind }
+attributes #9 = { nounwind returns_twice }
+attributes #10 = { noreturn }
+
+


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