[ARM] Hoist fabs/fneg above a conversion to float.

[oota-llvm.git] / lib / Target / ARM / ARMInstrVFP.td

diff --git a/lib/Target/ARM/ARMInstrVFP.td b/lib/Target/ARM/ARMInstrVFP.td
index 3a65390937a1958ce6850a5413ee96eee1b66d07..eef5634d821d8ce5d2860ab2c7876c68e028bc54 100644 (file)
--- a/lib/Target/ARM/ARMInstrVFP.td
+++ b/lib/Target/ARM/ARMInstrVFP.td
@@ -20,7 +20,6 @@ def arm_cmpfp  : SDNode<"ARMISD::CMPFP",   SDT_ARMCmp, [SDNPOutGlue]>;
 def arm_cmpfp0 : SDNode<"ARMISD::CMPFPw0", SDT_CMPFP0, [SDNPOutGlue]>;
 def arm_fmdrr  : SDNode<"ARMISD::VMOVDRR", SDT_VMOVDRR>;
 
-
 //===----------------------------------------------------------------------===//
 // Operand Definitions.
 //
@@ -922,6 +921,22 @@ def VMOVDRR : AVConv5I<0b11000100, 0b1011,
   let isRegSequence = 1;
 }
 
+// Hoist an fabs or a fneg of a value coming from integer registers
+// and do the fabs/fneg on the integer value. This is never a lose
+// and could enable the conversion to float to be removed completely.
+def : Pat<(fabs (arm_fmdrr GPR:$Rl, GPR:$Rh)),
+          (VMOVDRR GPR:$Rl, (BFC GPR:$Rh, (i32 0x7FFFFFFF)))>,
+      Requires<[IsARM]>;
+def : Pat<(fabs (arm_fmdrr GPR:$Rl, GPR:$Rh)),
+          (VMOVDRR GPR:$Rl, (t2BFC GPR:$Rh, (i32 0x7FFFFFFF)))>,
+      Requires<[IsThumb2]>;
+def : Pat<(fneg (arm_fmdrr GPR:$Rl, GPR:$Rh)),
+          (VMOVDRR GPR:$Rl, (EORri GPR:$Rh, (i32 0x80000000)))>,
+      Requires<[IsARM]>;
+def : Pat<(fneg (arm_fmdrr GPR:$Rl, GPR:$Rh)),
+          (VMOVDRR GPR:$Rl, (t2EORri GPR:$Rh, (i32 0x80000000)))>,
+      Requires<[IsThumb2]>;
+
 let hasSideEffects = 0 in
 def VMOVSRR : AVConv5I<0b11000100, 0b1010,
                      (outs SPR:$dst1, SPR:$dst2), (ins GPR:$src1, GPR:$src2),