[Hexagon] Use misaligned load instead of trap0(#0) for __builtin_trap

The trap instruction is intercepted by various runtime environments,
and instead of a crash it creates confusion.

This reapplies r354606 with a fix.

llvm-svn: 354611

2 files changed, 23 insertions, 1 deletions

diff --git a/llvm/test/CodeGen/Hexagon/trap-crash.ll b/llvm/test/CodeGen/Hexagon/trap-crash.ll
new file mode 100644
index 00000000000..e940d98b620
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/trap-crash.ll
@@ -0,0 +1,20 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+
+; Generate code that is guaranteed to crash. At the moment, it's a
+; misaligned load.
+; CHECK: memd(##3134984174)
+
+target triple = "hexagon"
+
+; Function Attrs: noreturn nounwind
+define i32 @f0() #0 {
+entry:
+  tail call void @llvm.trap()
+  unreachable
+}
+
+; Function Attrs: cold noreturn nounwind
+declare void @llvm.trap() #1
+
+attributes #0 = { noreturn nounwind "target-cpu"="hexagonv60" }
+attributes #1 = { cold noreturn nounwind }
diff --git a/llvm/test/CodeGen/Hexagon/trap-unreachable.ll b/llvm/test/CodeGen/Hexagon/trap-unreachable.ll
index 124b37a5c6c..b14f1e3c1a5 100644
--- a/llvm/test/CodeGen/Hexagon/trap-unreachable.ll
+++ b/llvm/test/CodeGen/Hexagon/trap-unreachable.ll
@@ -1,5 +1,7 @@
 ; RUN: llc -march=hexagon -trap-unreachable < %s | FileCheck %s
-; CHECK: trap
+
+; Trap is implemented via a misaligned load.
+; CHECK: memd(##3134984174)
 
 define void @fred() #0 {
   unreachable