[X86] Teach fastisel to select calls to dllimport functions
Summary:
Direct calls to dllimport functions are very common Windows. We should
add them to the -O0 fast path.
Reviewers: rafael
Subscribers: llvm-commits, hiraditya
Differential Revision: https://reviews.llvm.org/D36197
llvm-svn: 310152
diff --git a/llvm/test/CodeGen/X86/fast-isel-call-cleanup.ll b/llvm/test/CodeGen/X86/fast-isel-call-cleanup.ll
new file mode 100644
index 0000000..5289c90
--- /dev/null
+++ b/llvm/test/CodeGen/X86/fast-isel-call-cleanup.ll
@@ -0,0 +1,19 @@
+; RUN: llc -fast-isel -O0 -code-model=large -mcpu=generic -mtriple=x86_64-apple-darwin10 -relocation-model=pic < %s | FileCheck %s
+
+; Check that fast-isel cleans up when it fails to lower a call instruction.
+define void @fastiselcall() {
+entry:
+ %call = call i32 @targetfn(i32 42)
+ ret void
+; CHECK-LABEL: test5:
+; Local value area is still there:
+; CHECK: movl $42, {{%[a-z]+}}
+; Fast-ISel's arg mov is not here:
+; CHECK-NOT: movl $42, (%esp)
+; SDag-ISel's arg mov:
+; CHECK: movabsq $_targetfn, %[[REG:[^ ]*]]
+; CHECK: movl $42, %edi
+; CHECK: callq *%[[REG]]
+
+}
+declare i32 @targetfn(i32)