diff options
Diffstat (limited to 'test/CodeGen/X86/2008-06-13-VolatileLoadStore.ll')
| -rw-r--r-- | test/CodeGen/X86/2008-06-13-VolatileLoadStore.ll | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2008-06-13-VolatileLoadStore.ll b/test/CodeGen/X86/2008-06-13-VolatileLoadStore.ll new file mode 100644 index 0000000..8a81a33 --- /dev/null +++ b/test/CodeGen/X86/2008-06-13-VolatileLoadStore.ll @@ -0,0 +1,22 @@ +; RUN: llvm-as < %s | llc -march=x86 | grep movsd | count 5 +; RUN: llvm-as < %s | llc -march=x86 | grep movl | count 2 + +@atomic = global double 0.000000e+00 ; <double*> [#uses=1] +@atomic2 = global double 0.000000e+00 ; <double*> [#uses=1] +@anything = global i64 0 ; <i64*> [#uses=1] +@ioport = global i32 0 ; <i32*> [#uses=2] + +define i16 @f(i64 %x, double %y) { + %b = bitcast i64 %x to double ; <double> [#uses=1] + volatile store double %b, double* @atomic ; one processor operation only + volatile store double 0.000000e+00, double* @atomic2 ; one processor operation only + %b2 = bitcast double %y to i64 ; <i64> [#uses=1] + volatile store i64 %b2, i64* @anything ; may transform to store of double + %l = volatile load i32* @ioport ; must not narrow + %t = trunc i32 %l to i16 ; <i16> [#uses=1] + %l2 = volatile load i32* @ioport ; must not narrow + %tmp = lshr i32 %l2, 16 ; <i32> [#uses=1] + %t2 = trunc i32 %tmp to i16 ; <i16> [#uses=1] + %f = add i16 %t, %t2 ; <i16> [#uses=1] + ret i16 %f +} |