Let llc and opt override "-target-cpu" and "-target-features" via command line

options.

This commit fixes a bug in llc and opt where "-mcpu" and "-mattr" wouldn't
override function attributes "-target-cpu" and "-target-features" in the IR.

Differential Revision: http://reviews.llvm.org/D9537

llvm-svn: 236677

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/llc-override-mcpu-mattr.ll b/llvm/test/CodeGen/X86/llc-override-mcpu-mattr.ll
new file mode 100644
index 00000000000..52563bdba5b
--- /dev/null
+++ b/llvm/test/CodeGen/X86/llc-override-mcpu-mattr.ll
@@ -0,0 +1,19 @@
+; RUN: llc < %s -march x86-64 -mcpu=broadwell | FileCheck %s
+; RUN: llc < %s -march x86-64 -mattr=+avx2 | FileCheck %s
+
+; Check that llc can overide function attributes target-cpu and target-features
+; using command line options -mcpu and -mattr.
+
+; CHECK: vpsadbw %ymm{{[0-9]+}}, %ymm{{[0-9]+}}, %ymm{{[0-9]+}}
+
+define <4 x i64> @foo1(<4 x i64> %s1, <4 x i64> %s2) #0 {
+entry:
+  %0 = bitcast <4 x i64> %s1 to <32 x i8>
+  %1 = bitcast <4 x i64> %s2 to <32 x i8>
+  %2 = tail call <4 x i64> @llvm.x86.avx2.psad.bw(<32 x i8> %0, <32 x i8> %1)
+  ret <4 x i64> %2
+}
+
+declare <4 x i64> @llvm.x86.avx2.psad.bw(<32 x i8>, <32 x i8>)
+
+attributes #0 = { "target-cpu"="core2" "target-features"="+ssse3,+cx16,+sse4.2,+sse4.1,+sse,+sse2,+sse3,+avx,+popcnt" }