[X86] Add test case for PR15981

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306296 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/pr15981.ll b/test/CodeGen/X86/pr15981.ll
new file mode 100644 (file)
index 0000000..6b246ef
--- /dev/null
+++ b/test/CodeGen/X86/pr15981.ll
@@ -0,0 +1,59 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefix=X86
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64
+
+@a = external global i32
+@b = external global i32
+@c = external global i32
+
+define i32 @fn1(i32, i32) {
+; X86-LABEL: fn1:
+; X86:       # BB#0:
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    testl %eax, %eax
+; X86-NEXT:    je .LBB0_2
+; X86-NEXT:  # BB#1:
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:  .LBB0_2:
+; X86-NEXT:    retl
+;
+; X64-LABEL: fn1:
+; X64:       # BB#0:
+; X64-NEXT:    testl %esi, %esi
+; X64-NEXT:    cmovel %esi, %edi
+; X64-NEXT:    movl %edi, %eax
+; X64-NEXT:    retq
+  %3 = icmp ne i32 %1, 0
+  %4 = select i1 %3, i32 %0, i32 0
+  ret i32 %4
+}
+
+define void @fn2() {
+; X86-LABEL: fn2:
+; X86:       # BB#0:
+; X86-NEXT:    movl b, %eax
+; X86-NEXT:    decl a
+; X86-NEXT:    jne .LBB1_2
+; X86-NEXT:  # BB#1:
+; X86-NEXT:    xorl %eax, %eax
+; X86-NEXT:  .LBB1_2:
+; X86-NEXT:    movl %eax, c
+; X86-NEXT:    retl
+;
+; X64-LABEL: fn2:
+; X64:       # BB#0:
+; X64-NEXT:    xorl %eax, %eax
+; X64-NEXT:    decl {{.*}}(%rip)
+; X64-NEXT:    cmovnel {{.*}}(%rip), %eax
+; X64-NEXT:    movl %eax, {{.*}}(%rip)
+; X64-NEXT:    retq
+  %1 = load volatile i32, i32* @b, align 4
+  %2 = load i32, i32* @a, align 4
+  %3 = add nsw i32 %2, -1
+  store i32 %3, i32* @a, align 4
+  %4 = icmp ne i32 %3, 0
+  %5 = select i1 %4, i32 %1, i32 0
+  store i32 %5, i32* @c, align 4
+  ret void
+}
+