[arm-fast-isel] Doublewords only require word-alignment.
rdar://10528060
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145891 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index ea03fb7..de366f7 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -1106,7 +1106,7 @@
case MVT::f32:
if (!Subtarget->hasVFP2()) return false;
StrOpc = ARM::VSTRS;
- // Unaligned stores need special handling.
+ // Unaligned stores need special handling. Floats require word-alignment.
if (Alignment && Alignment < 4) {
unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::i32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
@@ -1119,8 +1119,9 @@
break;
case MVT::f64:
if (!Subtarget->hasVFP2()) return false;
- // FIXME: Unaligned stores need special handling.
- if (Alignment && Alignment < 8) {
+ // FIXME: Unaligned stores need special handling. Doublewords require
+ // word-alignment.
+ if (Alignment && Alignment < 4) {
return false;
}
StrOpc = ARM::VSTRD;
diff --git a/test/CodeGen/ARM/fast-isel.ll b/test/CodeGen/ARM/fast-isel.ll
index f9c1a9d..0697460 100644
--- a/test/CodeGen/ARM/fast-isel.ll
+++ b/test/CodeGen/ARM/fast-isel.ll
@@ -180,3 +180,21 @@
store float %add, float* %x1, align 1
ret void
}
+
+; Doublewords require only word-alignment.
+; rdar://10528060
+%struct.anon.0 = type { double }
+
+@foo_unpacked = common global %struct.anon.0 zeroinitializer, align 4
+
+define void @test5(double %a, double %b) nounwind {
+entry:
+; ARM: @test5
+; THUMB: @test5
+ %add = fadd double %a, %b
+ store double %add, double* getelementptr inbounds (%struct.anon.0* @foo_unpacked, i32 0, i32 0), align 4
+; ARM: vstr d16, [r0]
+; THUMB: vstr d16, [r0]
+ ret void
+}
+