CodeGen peephole: fold redundant phys reg copies

[oota-llvm.git] / test / CodeGen / X86 / rdtsc.ll

diff --git a/test/CodeGen/X86/rdtsc.ll b/test/CodeGen/X86/rdtsc.ll
index f5d947fcbabb5957a06a4b9772398eede02a5b67..dba614ad104ece72445370a81d989a5394a0d5ed 100644 (file)
--- a/test/CodeGen/X86/rdtsc.ll
+++ b/test/CodeGen/X86/rdtsc.ll
@@ -1,8 +1,49 @@
-; RUN: llvm-as < %s | llc -march=x86 | grep rdtsc
-; RUN: llvm-as < %s | llc -march=x86-64 | grep rdtsc
-declare i64 @llvm.readcyclecounter()
+; RUN: llc < %s -march=x86-64 -mcpu=generic | FileCheck %s
+; RUN: llc < %s -march=x86 -mcpu=generic | FileCheck %s --check-prefix=CHECK --check-prefix=X86
+
+; Verify that we correctly lower ISD::READCYCLECOUNTER.
+
+
+define i64 @test_builtin_readcyclecounter() {
+  %1 = tail call i64 @llvm.readcyclecounter()
+  ret i64 %1
+}
+; CHECK-LABEL: test_builtin_readcyclecounter
+; CHECK: rdtsc
+; X86-NOT: shlq
+; X86-NOT: or
+; CHECK-NOT: mov
+; CHECK: ret
+
+
+; Verify that we correctly lower the Read Cycle Counter GCC x86 builtins
+; (i.e. RDTSC and RDTSCP).
 
-define i64 @foo() {
-       %tmp.1 = call i64 @llvm.readcyclecounter( )             ; <i64> [#uses=1]
-       ret i64 %tmp.1
+define i64 @test_builtin_rdtsc() {
+  %1 = tail call i64 @llvm.x86.rdtsc()
+  ret i64 %1
 }
+; CHECK-LABEL: test_builtin_rdtsc
+; CHECK: rdtsc
+; X86-NOT: shlq
+; X86-NOT: or
+; CHECK-NOT: mov
+; CHECK: ret
+
+
+define i64 @test_builtin_rdtscp(i8* %A) {
+  %1 = tail call i64 @llvm.x86.rdtscp(i8* %A)
+  ret i64 %1
+}
+; CHECK-LABEL: test_builtin_rdtscp
+; CHECK: rdtscp
+; X86-NOT: shlq
+; CHECK:   movl        %ecx, (%{{[a-z0-9]+}})
+; X86-NOT: shlq
+; CHECK: ret
+
+
+declare i64 @llvm.readcyclecounter()
+declare i64 @llvm.x86.rdtscp(i8*)
+declare i64 @llvm.x86.rdtsc()
+