llvm-mirror/zext-trunc.ll at 5ae34cf120dc4cf5c2381e9a225789e4073ac541 - llvm-mirror - Git.je (Gitea)

RPCS3/llvm-mirror

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Evan Cheng 8bee7fb61d Now that ShrinkDemandedOps() is separated out from DAG combine. It sometimes leave some obvious nops which dag combine used to clean up afterwards e.g. (trunk (ext n)) -> n. Look for them and squash them.

llvm-svn: 95757

2010-02-10 02:17:34 +00:00

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 ; RUN: llc < %s -march=x86-64 | FileCheck %s
 ; rdar://7570931
 define i64 @foo(i64 %a, i64 %b) nounwind {
 ; CHECK: foo:
 ; CHECK: leal
 ; CHECK-NOT: movl
 ; CHECK: ret
   %c = add i64 %a, %b
   %d = trunc i64 %c to i32
   %e = zext i32 %d to i64
   ret i64 %e
 }