Guard fabs to bfc convert with V6T2 flag

Summary:
BFC instructions are available in ARMv6T2 and above.

Reviewers: t.p.northover

Subscribers: aemerson

Differential Revision: http://reviews.llvm.org/D16076

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257546 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMInstrVFP.td b/lib/Target/ARM/ARMInstrVFP.td
index 050cd1a445ad7f7b67d967cdceec32181d9fd5dc..63e7940bb14ee7cee5ed91182c0ab9ccb7271ac8 100644 (file)
--- a/lib/Target/ARM/ARMInstrVFP.td
+++ b/lib/Target/ARM/ARMInstrVFP.td
@@ -930,10 +930,10 @@ def VMOVDRR : AVConv5I<0b11000100, 0b1011,
 // 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)))>,
 // 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]>;
+      Requires<[IsARM, HasV6T2]>;

 def : Pat<(fabs (arm_fmdrr GPR:$Rl, GPR:$Rh)),
           (VMOVDRR GPR:$Rl, (t2BFC GPR:$Rh, (i32 0x7FFFFFFF)))>,
 def : Pat<(fabs (arm_fmdrr GPR:$Rl, GPR:$Rh)),
           (VMOVDRR GPR:$Rl, (t2BFC GPR:$Rh, (i32 0x7FFFFFFF)))>,

-      Requires<[IsThumb2]>;
+      Requires<[IsThumb2, HasV6T2]>;

 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:$Rl, (EORri GPR:$Rh, (i32 0x80000000)))>,
       Requires<[IsARM]>;

diff --git a/test/CodeGen/ARM/fabs-to-bfc.ll b/test/CodeGen/ARM/fabs-to-bfc.ll
new file mode 100644 (file)
index 0000000..1a2e045
--- /dev/null
+++ b/test/CodeGen/ARM/fabs-to-bfc.ll
@@ -0,0 +1,14 @@
+; RUN: llc < %s -mtriple=armv5e-none-linux-gnueabi -mattr=+vfp2  | FileCheck %s -check-prefix=CHECK-VABS
+; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi  -mattr=+vfp3 | FileCheck  %s -check-prefix=CHECK-BFC
+
+
+define double @test(double %tx) {
+;CHECK-LABEL: test:
+  %call = tail call double @fabs(double %tx)
+  ret double %call
+;CHECK-VABS: vabs.f64
+;CHECK-BFC: bfc
+}
+
+declare double @fabs(double) readnone
+