1 files changed, 50 insertions, 1 deletions
diff --git a/test/CodeGen/ARM/fnegs.ll b/test/CodeGen/ARM/fnegs.ll
index 36af8352433e..65fe9e36fa1d 100644
--- a/test/CodeGen/ARM/fnegs.ll
+++ b/test/CodeGen/ARM/fnegs.ll
@@ -1,9 +1,12 @@
 ; RUN: llc -mtriple=arm-eabi -mattr=+vfp2 %s -o - \
 ; RUN:  | FileCheck %s -check-prefix=VFP2
 
-; RUN: llc -mtriple=arm-eabi -mattr=+neon %s -o - \
+; RUN: llc -mtriple=arm-eabi -mattr=+neon,-neonfp %s -o - \
 ; RUN:  | FileCheck %s -check-prefix=NFP0
 
+; RUN: llc -mtriple=arm-eabi -mattr=+neon,+neonfp %s -o - \
+; RUN:  | FileCheck %s -check-prefix=NFP1
+
 ; RUN: llc -mtriple=arm-eabi -mcpu=cortex-a8 %s -o - \
 ; RUN:  | FileCheck %s -check-prefix=CORTEXA8
 
@@ -70,3 +73,49 @@ entry:
 ; CORTEXA9-LABEL: test2:
 ; CORTEXA9: 	vneg.f32	s{{.*}}, s{{.*}}
 
+; If we're bitcasting an integer to an FP vector, we should avoid the FP/vector unit entirely.
+; Make sure that we're flipping the sign bit and only the sign bit of each float (PR20354).
+; So instead of something like this:
+;    vmov     d16, r0, r1
+;    vneg.f32 d16, d16
+;    vmov     r0, r1, d16
+;
+; We should generate:
+;    eor     r0, r0, #-214783648
+;    eor     r1, r1, #-214783648
+
+define <2 x float> @fneg_bitcast(i64 %i) {
+  %bitcast = bitcast i64 %i to <2 x float>
+  %fneg = fsub <2 x float> <float -0.0, float -0.0>, %bitcast
+  ret <2 x float> %fneg
+}
+; VFP2-LABEL: fneg_bitcast:
+; VFP2-DAG: eor r0, r0, #-2147483648
+; VFP2-DAG: eor r1, r1, #-2147483648
+; VFP2-NOT:  vneg.f32
+
+; NFP1-LABEL: fneg_bitcast:
+; NFP1-DAG: eor r0, r0, #-2147483648
+; NFP1-DAG: eor r1, r1, #-2147483648
+; NFP1-NOT: vneg.f32
+
+; NFP0-LABEL: fneg_bitcast:
+; NFP0-DAG: eor r0, r0, #-2147483648
+; NFP0-DAG: eor r1, r1, #-2147483648
+; NFP0-NOT: vneg.f32
+
+; CORTEXA8-LABEL: fneg_bitcast:
+; CORTEXA8-DAG: eor r0, r0, #-2147483648
+; CORTEXA8-DAG: eor r1, r1, #-2147483648
+; CORTEXA8-NOT:         vneg.f32
+
+; CORTEXA8U-LABEL: fneg_bitcast:
+; CORTEXA8U-DAG: eor r0, r0, #-2147483648
+; CORTEXA8U-DAG: eor r1, r1, #-2147483648
+; CORTEXA8U-NOT:        vneg.f32
+
+; CORTEXA9-LABEL: fneg_bitcast:
+; CORTEXA9-DAG: eor r0, r0, #-2147483648
+; CORTEXA9-DAG: eor r1, r1, #-2147483648
+; CORTEXA9-NOT:         vneg.f32
+