Don't glue users to extract_subreg when selecting the llvm.arm.ldrexd

[oota-llvm.git] / test / CodeGen / ARM / fpcmp-opt.ll

diff --git a/test/CodeGen/ARM/fpcmp-opt.ll b/test/CodeGen/ARM/fpcmp-opt.ll
index f651c167cc71d2431745a976edf4577272d89f33..2d8f7108e0ec46025f639ba8fd886ccb37977e23 100644 (file)
--- a/test/CodeGen/ARM/fpcmp-opt.ll
+++ b/test/CodeGen/ARM/fpcmp-opt.ll
@@ -1,15 +1,15 @@
-; RUN: llc < %s -march=arm -mattr=+vfp2 -enable-unsafe-fp-math | FileCheck %s
+; RUN: llc < %s -march=arm -mcpu=cortex-a8 -mattr=+vfp2 -enable-unsafe-fp-math | FileCheck %s
 ; rdar://7461510
+; rdar://10964603
 
+; Disable this optimization unless we know one of them is zero.
 define arm_apcscc i32 @t1(float* %a, float* %b) nounwind {
 entry:
 ; CHECK: t1:
-; CHECK-NOT: vldr
-; CHECK: ldr
-; CHECK: ldr
-; CHECK: cmp r0, r1
-; CHECK-NOT: vcmpe.f32
-; CHECK-NOT: vmrs
+; CHECK: vldr [[S0:s[0-9]+]],
+; CHECK: vldr [[S1:s[0-9]+]],
+; CHECK: vcmpe.f32 [[S1]], [[S0]]
+; CHECK: vmrs APSR_nzcv, fpscr
 ; CHECK: beq
   %0 = load float* %a
   %1 = load float* %b
@@ -25,5 +25,56 @@ bb2:
   ret i32 %4
 }
 
+; If one side is zero, the other size sign bit is masked off to allow
+; +0.0 == -0.0
+define arm_apcscc i32 @t2(double* %a, double* %b) nounwind {
+entry:
+; CHECK: t2:
+; CHECK-NOT: vldr
+; CHECK: ldr [[REG1:(r[0-9]+)]], [r0]
+; CHECK: ldr [[REG2:(r[0-9]+)]], [r0, #4]
+; CHECK-NOT: b LBB
+; CHECK: cmp [[REG1]], #0
+; CHECK: bfc [[REG2]], #31, #1
+; CHECK: cmpeq [[REG2]], #0
+; CHECK-NOT: vcmpe.f32
+; CHECK-NOT: vmrs
+; CHECK: bne
+  %0 = load double* %a
+  %1 = fcmp oeq double %0, 0.000000e+00
+  br i1 %1, label %bb1, label %bb2
+
+bb1:
+  %2 = call i32 @bar()
+  ret i32 %2
+
+bb2:
+  %3 = call i32 @foo()
+  ret i32 %3
+}
+
+define arm_apcscc i32 @t3(float* %a, float* %b) nounwind {
+entry:
+; CHECK: t3:
+; CHECK-NOT: vldr
+; CHECK: ldr [[REG3:(r[0-9]+)]], [r0]
+; CHECK: mvn [[REG4:(r[0-9]+)]], #-2147483648
+; CHECK: tst [[REG3]], [[REG4]]
+; CHECK-NOT: vcmpe.f32
+; CHECK-NOT: vmrs
+; CHECK: bne
+  %0 = load float* %a
+  %1 = fcmp oeq float %0, 0.000000e+00
+  br i1 %1, label %bb1, label %bb2
+
+bb1:
+  %2 = call i32 @bar()
+  ret i32 %2
+
+bb2:
+  %3 = call i32 @foo()
+  ret i32 %3
+}
+
 declare i32 @bar()
 declare i32 @foo()