diff --git a/llvm/lib/Target/X86/X86InstructionSelector.cpp b/llvm/lib/Target/X86/X86InstructionSelector.cpp
--- a/llvm/lib/Target/X86/X86InstructionSelector.cpp
+++ b/llvm/lib/Target/X86/X86InstructionSelector.cpp
@@ -1435,7 +1435,7 @@
   const Register DstReg = I.getOperand(0).getReg();
   const LLT DstTy = MRI.getType(DstReg);
   const RegisterBank &RegBank = *RBI.getRegBank(DstReg, MRI, TRI);
-  unsigned Align = DstTy.getSizeInBits();
+  unsigned Align = DstTy.getSizeInBits() / 8;
   const DebugLoc &DbgLoc = I.getDebugLoc();
 
   unsigned Opc = getLoadStoreOp(DstTy, RegBank, TargetOpcode::G_LOAD, Align);
diff --git a/llvm/test/CodeGen/X86/GlobalISel/select-fconstant.mir b/llvm/test/CodeGen/X86/GlobalISel/select-fconstant.mir
--- a/llvm/test/CodeGen/X86/GlobalISel/select-fconstant.mir
+++ b/llvm/test/CodeGen/X86/GlobalISel/select-fconstant.mir
@@ -35,7 +35,7 @@
     ; CHECK_NOPIC64: RET 0, implicit $xmm0
     ; CHECK_LARGE64-LABEL: name: test_float
     ; CHECK_LARGE64: [[MOV64ri:%[0-9]+]]:gr64 = MOV64ri %const.0
-    ; CHECK_LARGE64: [[MOVSSrm_alt:%[0-9]+]]:fr32 = MOVSSrm_alt [[MOV64ri]], 1, $noreg, 0, $noreg :: (load 8 from constant-pool, align 32)
+    ; CHECK_LARGE64: [[MOVSSrm_alt:%[0-9]+]]:fr32 = MOVSSrm_alt [[MOV64ri]], 1, $noreg, 0, $noreg :: (load 8 from constant-pool, align 4)
     ; CHECK_LARGE64: [[COPY:%[0-9]+]]:vr128 = COPY [[MOVSSrm_alt]]
     ; CHECK_LARGE64: $xmm0 = COPY [[COPY]]
     ; CHECK_LARGE64: RET 0, implicit $xmm0
@@ -82,7 +82,7 @@
     ; CHECK_NOPIC64: RET 0, implicit $xmm0
     ; CHECK_LARGE64-LABEL: name: test_double
     ; CHECK_LARGE64: [[MOV64ri:%[0-9]+]]:gr64 = MOV64ri %const.0
-    ; CHECK_LARGE64: [[MOVSDrm_alt:%[0-9]+]]:fr64 = MOVSDrm_alt [[MOV64ri]], 1, $noreg, 0, $noreg :: (load 8 from constant-pool, align 64)
+    ; CHECK_LARGE64: [[MOVSDrm_alt:%[0-9]+]]:fr64 = MOVSDrm_alt [[MOV64ri]], 1, $noreg, 0, $noreg :: (load 8 from constant-pool)
     ; CHECK_LARGE64: [[COPY:%[0-9]+]]:vr128 = COPY [[MOVSDrm_alt]]
     ; CHECK_LARGE64: $xmm0 = COPY [[COPY]]
     ; CHECK_LARGE64: RET 0, implicit $xmm0