[llvm] 96296d9 - [DAGCombiner] Precommit test case for D95086

[Guozhi Wei via llvm-commits]

Author: Guozhi Wei
Date: 2021-01-20T17:15:47-08:00
New Revision: 96296d9220ee5193f6ad7ff181d42c10d9f3c7e3

URL: https://github.com/llvm/llvm-project/commit/96296d9220ee5193f6ad7ff181d42c10d9f3c7e3
DIFF: https://github.com/llvm/llvm-project/commit/96296d9220ee5193f6ad7ff181d42c10d9f3c7e3.diff

LOG: [DAGCombiner] Precommit test case for D95086

This is the test case for D95086 with worse result.

Differential Revision: https://reviews.llvm.org/D95103

Added: 
    llvm/test/CodeGen/X86/select-ext.ll

Modified: 
    

Removed: 
    


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diff  --git a/llvm/test/CodeGen/X86/select-ext.ll b/llvm/test/CodeGen/X86/select-ext.ll
new file mode 100644
index 000000000000..848d6fa5f0c7
--- /dev/null
+++ b/llvm/test/CodeGen/X86/select-ext.ll
@@ -0,0 +1,21 @@
+; RUN: llc -mtriple=x86_64-unknown-unknown < %s | FileCheck %s
+
+; TODO: (zext(select c, load1, load2)) -> (select c, zextload1, zextload2)
+
+; CHECK-LABEL: foo
+; CHECK:        movzbl  (%rdi), %eax
+; CHECK-NEXT:   movzbl  1(%rdi), %ecx
+; CHECK-NEXT:   testl   %esi, %esi
+; CHECK-NEXT:   cmovel  %eax, %ecx
+; CHECK-NEXT:   movzbl  %cl, %eax
+; CHECK-NEXT:   retq
+
+define i64 @foo(i8* %p, i1 zeroext %c) {
+  %ld1 = load volatile i8, i8* %p
+  %arrayidx1 = getelementptr inbounds i8, i8* %p, i64 1
+  %ld2 = load volatile i8, i8* %arrayidx1
+  %cond.v = select i1 %c, i8 %ld2, i8 %ld1
+  %cond = zext i8 %cond.v to i64
+  ret i64 %cond
+}
+