[llvm] r175555 - ARM NEON: Don't need COPY_TO_REGCLASS in pattern

[Arnold Schwaighofer]

Author: arnolds
Date: Tue Feb 19 14:16:45 2013
New Revision: 175555

URL: http://llvm.org/viewvc/llvm-project?rev=175555&view=rev
Log:
ARM NEON: Don't need COPY_TO_REGCLASS in pattern

In my previous commit:
"Merge a f32 bitcast of a v2i32 extractelt

A vectorized sitfp on doubles will get scalarized to a sequence of an
extract_element of <2 x i32>, a bitcast to f32 and a sitofp.
Due to the the extract_element, and the bitcast we will uneccessarily generate
moves between scalar and vector registers."

I added a pattern containing a copy_to_regclass. The copy_to_regclass is
actually not needed.

radar://13191881

Modified:
    llvm/trunk/lib/Target/ARM/ARMInstrNEON.td

Modified: llvm/trunk/lib/Target/ARM/ARMInstrNEON.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMInstrNEON.td?rev=175555&r1=175554&r2=175555&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMInstrNEON.td (original)
+++ llvm/trunk/lib/Target/ARM/ARMInstrNEON.td Tue Feb 19 14:16:45 2013
@@ -5747,9 +5747,7 @@ def : Pat<(v2f64 (bitconvert (v4f32 QPR:
 
 // Fold extracting an element out of a v2i32 into a vfp register.
 def : Pat<(f32 (bitconvert (i32 (extractelt (v2i32 DPR:$src), imm:$lane)))),
-          (f32 (EXTRACT_SUBREG
-                (v2f32 (COPY_TO_REGCLASS (v2i32 DPR:$src), DPR)),
-                (SSubReg_f32_reg imm:$lane)))>;
+          (f32 (EXTRACT_SUBREG DPR:$src, (SSubReg_f32_reg imm:$lane)))>;
 
 // Vector lengthening move with load, matching extending loads.