-; RUN: llc < %s -march=arm -mattr=+vfp2 | 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
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()