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-rw-r--r--lib/Target/X86/README-SSE.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt
index 2685956dc1..b80661a5b7 100644
--- a/lib/Target/X86/README-SSE.txt
+++ b/lib/Target/X86/README-SSE.txt
@@ -18,6 +18,11 @@ Think about doing i64 math in SSE regs.
//===---------------------------------------------------------------------===//
+Bitcast to<->from SSE registers should use movd/movq instead of going through
+the stack. Testcase here: CodeGen/X86/bitcast.ll
+
+//===---------------------------------------------------------------------===//
+
This testcase should have no SSE instructions in it, and only one load from
a constant pool: