Make x86-64 64-bit bitconvert work when SSE is not available.

(This worked as of about 6 months ago and I didn't track down
exactly what broke it; I think this fix is appropriate.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103911 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 9fa7bb1d3cc807010ca5718d801e1b3d74dab9b3..35127eb84dbcd0d7b97006c7e4c05492b6715316 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -217,6 +217,10 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
   if (!X86ScalarSSEf64) {
     setOperationAction(ISD::BIT_CONVERT      , MVT::f32  , Expand);
     setOperationAction(ISD::BIT_CONVERT      , MVT::i32  , Expand);
+    if (Subtarget->is64Bit()) {
+      setOperationAction(ISD::BIT_CONVERT      , MVT::f64  , Expand);
+      setOperationAction(ISD::BIT_CONVERT      , MVT::i64  , Expand);
+    }
   }
 
   // Scalar integer divide and remainder are lowered to use operations that

diff --git a/test/CodeGen/X86/2010-05-16-nosseconversion.ll b/test/CodeGen/X86/2010-05-16-nosseconversion.ll
new file mode 100644 (file)
index 0000000..266681c
--- /dev/null
+++ b/test/CodeGen/X86/2010-05-16-nosseconversion.ll
@@ -0,0 +1,11 @@
+; RUN: llc -mtriple=x86_64-apple-darwin -mattr=-sse < %s
+
+@x = common global i64 0                          ; <i64*> [#uses=1]
+
+define i32 @foo() nounwind readonly ssp {
+entry:
+  %0 = load i64* @x, align 8                      ; <i64> [#uses=1]
+  %1 = uitofp i64 %0 to double                    ; <double> [#uses=1]
+  %2 = fptosi double %1 to i32                    ; <i32> [#uses=1]
+  ret i32 %2
+}