llvm-6502/zext-trunc.ll at a3f88148e66b6b42d5843f33db675ffa935ccb15 - llvm-6502 - Applefritter: Git

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Evan Cheng 046632f272 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95757 91177308-0d34-0410-b5e6-96231b3b80d8

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
 }