+; RUN: llc < %s -mtriple aarch64--none-eabi -mcpu=cortex-a57 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=LE
+; RUN: llc < %s -mtriple aarch64_be--none-eabi -mcpu=cortex-a57 -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=BE
+
+; CHECK-LABEL: Ldrh_merge
+; CHECK-NOT: ldrh
+; CHECK: ldr [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xffff
+; CHECK-DAG: lsr [[HI_PART:w[0-9]+]], [[NEW_DEST]], #16
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i16 @Ldrh_merge(i16* nocapture readonly %p) {
+ %1 = load i16, i16* %p, align 2
+ %arrayidx2 = getelementptr inbounds i16, i16* %p, i64 1
+ %2 = load i16, i16* %arrayidx2, align 2
+ %add = sub nuw nsw i16 %1, %2
+ ret i16 %add
+}
+
+; CHECK-LABEL: Ldurh_merge
+; CHECK-NOT: ldurh
+; CHECK: ldur [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xffff
+; CHECK-DAG: lsr [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i16 @Ldurh_merge(i16* nocapture readonly %p) {
+entry:
+ %arrayidx = getelementptr inbounds i16, i16* %p, i64 -2
+ %0 = load i16, i16* %arrayidx
+ %arrayidx3 = getelementptr inbounds i16, i16* %p, i64 -1
+ %1 = load i16, i16* %arrayidx3
+ %add = sub nuw nsw i16 %0, %1
+ ret i16 %add
+}
+
+; CHECK-LABEL: Ldrh_4_merge
+; CHECK-NOT: ldrh
+; CHECK: ldp [[WORD1:w[0-9]+]], [[WORD2:w[0-9]+]], [x0]
+; CHECK-DAG: and [[WORD1LO:w[0-9]+]], [[WORD1]], #0xffff
+; CHECK-DAG: lsr [[WORD1HI:w[0-9]+]], [[WORD1]], #16
+; CHECK-DAG: and [[WORD2LO:w[0-9]+]], [[WORD2]], #0xffff
+; CHECK-DAG: lsr [[WORD2HI:w[0-9]+]], [[WORD2]], #16
+; LE-DAG: sub [[TEMP1:w[0-9]+]], [[WORD1HI]], [[WORD1LO]]
+; BE-DAG: sub [[TEMP1:w[0-9]+]], [[WORD1LO]], [[WORD1HI]]
+; LE: udiv [[TEMP2:w[0-9]+]], [[TEMP1]], [[WORD2LO]]
+; BE: udiv [[TEMP2:w[0-9]+]], [[TEMP1]], [[WORD2HI]]
+; LE: sub w0, [[TEMP2]], [[WORD2HI]]
+; BE: sub w0, [[TEMP2]], [[WORD2LO]]
+define i16 @Ldrh_4_merge(i16* nocapture readonly %P) {
+ %arrayidx = getelementptr inbounds i16, i16* %P, i64 0
+ %l0 = load i16, i16* %arrayidx
+ %arrayidx2 = getelementptr inbounds i16, i16* %P, i64 1
+ %l1 = load i16, i16* %arrayidx2
+ %arrayidx7 = getelementptr inbounds i16, i16* %P, i64 2
+ %l2 = load i16, i16* %arrayidx7
+ %arrayidx12 = getelementptr inbounds i16, i16* %P, i64 3
+ %l3 = load i16, i16* %arrayidx12
+ %add4 = sub nuw nsw i16 %l1, %l0
+ %add9 = udiv i16 %add4, %l2
+ %add14 = sub nuw nsw i16 %add9, %l3
+ ret i16 %add14
+}
+
+; CHECK-LABEL: Ldrsh_merge
+; CHECK: ldr [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: asr [[LO_PART:w[0-9]+]], [[NEW_DEST]], #16
+; CHECK-DAG: sxth [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+
+define i32 @Ldrsh_merge(i16* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i16, i16* %p, i64 4
+ %tmp = load i16, i16* %add.ptr0
+ %add.ptr = getelementptr inbounds i16, i16* %p, i64 5
+ %tmp1 = load i16, i16* %add.ptr
+ %sexttmp = sext i16 %tmp to i32
+ %sexttmp1 = sext i16 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp1, %sexttmp
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldrsh_zsext_merge
+; CHECK: ldr [[NEW_DEST:w[0-9]+]]
+; LE-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xffff
+; LE-DAG: asr [[HI_PART:w[0-9]+]], [[NEW_DEST]], #16
+; BE-DAG: sxth [[LO_PART:w[0-9]+]], [[NEW_DEST]]
+; BE-DAG: lsr [[HI_PART:w[0-9]+]], [[NEW_DEST]], #16
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldrsh_zsext_merge(i16* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i16, i16* %p, i64 4
+ %tmp = load i16, i16* %add.ptr0
+ %add.ptr = getelementptr inbounds i16, i16* %p, i64 5
+ %tmp1 = load i16, i16* %add.ptr
+ %sexttmp = zext i16 %tmp to i32
+ %sexttmp1 = sext i16 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldrsh_szext_merge
+; CHECK: ldr [[NEW_DEST:w[0-9]+]]
+; LE-DAG: sxth [[LO_PART:w[0-9]+]], [[NEW_DEST]]
+; LE-DAG: lsr [[HI_PART:w[0-9]+]], [[NEW_DEST]], #16
+; BE-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xffff
+; BE-DAG: asr [[HI_PART:w[0-9]+]], [[NEW_DEST]], #16
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldrsh_szext_merge(i16* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i16, i16* %p, i64 4
+ %tmp = load i16, i16* %add.ptr0
+ %add.ptr = getelementptr inbounds i16, i16* %p, i64 5
+ %tmp1 = load i16, i16* %add.ptr
+ %sexttmp = sext i16 %tmp to i32
+ %sexttmp1 = zext i16 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldrb_merge
+; CHECK: ldrh [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xff
+; CHECK-DAG: ubfx [[HI_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldrb_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 2
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 3
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = zext i8 %tmp to i32
+ %sexttmp1 = zext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldrsb_merge
+; CHECK: ldrh [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: sxtb [[LO_PART:w[0-9]+]], [[NEW_DEST]]
+; CHECK-DAG: sbfx [[HI_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldrsb_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 2
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 3
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = sext i8 %tmp to i32
+ %sexttmp1 = sext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldrsb_zsext_merge
+; CHECK: ldrh [[NEW_DEST:w[0-9]+]]
+; LE-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xff
+; LE-DAG: sbfx [[HI_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; BE-DAG: sxtb [[LO_PART:w[0-9]+]], [[NEW_DEST]]
+; BE-DAG: ubfx [[HI_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldrsb_zsext_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 2
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 3
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = zext i8 %tmp to i32
+ %sexttmp1 = sext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldrsb_szext_merge
+; CHECK: ldrh [[NEW_DEST:w[0-9]+]]
+; LE-DAG: sxtb [[LO_PART:w[0-9]+]], [[NEW_DEST]]
+; LE-DAG: ubfx [[HI_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; BE-DAG: and [[LO_PART:w[0-9]+]], [[NEW_DEST]], #0xff
+; BE-DAG: sbfx [[HI_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldrsb_szext_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 2
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 3
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = sext i8 %tmp to i32
+ %sexttmp1 = zext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldursh_merge
+; CHECK: ldur [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: asr [[LO_PART:w[0-9]+]], [[NEW_DEST]], #16
+; CHECK-DAG: sxth [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldursh_merge(i16* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i16, i16* %p, i64 -1
+ %tmp = load i16, i16* %add.ptr0
+ %add.ptr = getelementptr inbounds i16, i16* %p, i64 -2
+ %tmp1 = load i16, i16* %add.ptr
+ %sexttmp = sext i16 %tmp to i32
+ %sexttmp1 = sext i16 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldursh_zsext_merge
+; CHECK: ldur [[NEW_DEST:w[0-9]+]]
+; LE-DAG: lsr [[LO_PART:w[0-9]+]], [[NEW_DEST]], #16
+; LE-DAG: sxth [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; BE-DAG: asr [[LO_PART:w[0-9]+]], [[NEW_DEST]], #16
+; BE-DAG: and [[HI_PART:w[0-9]+]], [[NEW_DEST]], #0xffff
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldursh_zsext_merge(i16* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i16, i16* %p, i64 -1
+ %tmp = load i16, i16* %add.ptr0
+ %add.ptr = getelementptr inbounds i16, i16* %p, i64 -2
+ %tmp1 = load i16, i16* %add.ptr
+ %sexttmp = zext i16 %tmp to i32
+ %sexttmp1 = sext i16 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldursh_szext_merge
+; CHECK: ldur [[NEW_DEST:w[0-9]+]]
+; LE-DAG: asr [[LO_PART:w[0-9]+]], [[NEW_DEST]], #16
+; LE-DAG: and [[HI_PART:w[0-9]+]], [[NEW_DEST]], #0xffff
+; BE-DAG: lsr [[LO_PART:w[0-9]+]], [[NEW_DEST]], #16
+; BE-DAG: sxth [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldursh_szext_merge(i16* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i16, i16* %p, i64 -1
+ %tmp = load i16, i16* %add.ptr0
+ %add.ptr = getelementptr inbounds i16, i16* %p, i64 -2
+ %tmp1 = load i16, i16* %add.ptr
+ %sexttmp = sext i16 %tmp to i32
+ %sexttmp1 = zext i16 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldurb_merge
+; CHECK: ldurh [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: ubfx [[LO_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; CHECK-DAG: and [[HI_PART:w[0-9]+]], [[NEW_DEST]], #0xff
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldurb_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 -1
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 -2
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = zext i8 %tmp to i32
+ %sexttmp1 = zext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldursb_merge
+; CHECK: ldurh [[NEW_DEST:w[0-9]+]]
+; CHECK-DAG: sbfx [[LO_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; CHECK-DAG: sxtb [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldursb_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 -1
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 -2
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = sext i8 %tmp to i32
+ %sexttmp1 = sext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldursb_zsext_merge
+; CHECK: ldurh [[NEW_DEST:w[0-9]+]]
+; LE-DAG: ubfx [[LO_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; LE-DAG: sxtb [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; BE-DAG: sbfx [[LO_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; BE-DAG: and [[HI_PART:w[0-9]+]], [[NEW_DEST]], #0xff
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldursb_zsext_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 -1
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 -2
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = zext i8 %tmp to i32
+ %sexttmp1 = sext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Ldursb_szext_merge
+; CHECK: ldurh [[NEW_DEST:w[0-9]+]]
+; LE-DAG: sbfx [[LO_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; LE-DAG: and [[HI_PART:w[0-9]+]], [[NEW_DEST]], #0xff
+; BE-DAG: ubfx [[LO_PART:w[0-9]+]], [[NEW_DEST]], #8, #8
+; BE-DAG: sxtb [[HI_PART:w[0-9]+]], [[NEW_DEST]]
+; LE: sub {{w[0-9]+}}, [[LO_PART]], [[HI_PART]]
+; BE: sub {{w[0-9]+}}, [[HI_PART]], [[LO_PART]]
+define i32 @Ldursb_szext_merge(i8* %p) nounwind {
+ %add.ptr0 = getelementptr inbounds i8, i8* %p, i64 -1
+ %tmp = load i8, i8* %add.ptr0
+ %add.ptr = getelementptr inbounds i8, i8* %p, i64 -2
+ %tmp1 = load i8, i8* %add.ptr
+ %sexttmp = sext i8 %tmp to i32
+ %sexttmp1 = zext i8 %tmp1 to i32
+ %add = sub nsw i32 %sexttmp, %sexttmp1
+ ret i32 %add
+}
+
+; CHECK-LABEL: Strh_zero
+; CHECK: str wzr
+define void @Strh_zero(i16* nocapture %P, i32 %n) {
+entry:
+ %idxprom = sext i32 %n to i64
+ %arrayidx = getelementptr inbounds i16, i16* %P, i64 %idxprom
+ store i16 0, i16* %arrayidx
+ %add = add nsw i32 %n, 1
+ %idxprom1 = sext i32 %add to i64
+ %arrayidx2 = getelementptr inbounds i16, i16* %P, i64 %idxprom1
+ store i16 0, i16* %arrayidx2
+ ret void
+}
+
+; CHECK-LABEL: Strh_zero_4
+; CHECK: stp wzr, wzr
+define void @Strh_zero_4(i16* nocapture %P, i32 %n) {
+entry:
+ %idxprom = sext i32 %n to i64
+ %arrayidx = getelementptr inbounds i16, i16* %P, i64 %idxprom
+ store i16 0, i16* %arrayidx
+ %add = add nsw i32 %n, 1
+ %idxprom1 = sext i32 %add to i64
+ %arrayidx2 = getelementptr inbounds i16, i16* %P, i64 %idxprom1
+ store i16 0, i16* %arrayidx2
+ %add3 = add nsw i32 %n, 2
+ %idxprom4 = sext i32 %add3 to i64
+ %arrayidx5 = getelementptr inbounds i16, i16* %P, i64 %idxprom4
+ store i16 0, i16* %arrayidx5
+ %add6 = add nsw i32 %n, 3
+ %idxprom7 = sext i32 %add6 to i64
+ %arrayidx8 = getelementptr inbounds i16, i16* %P, i64 %idxprom7
+ store i16 0, i16* %arrayidx8
+ ret void
+}
+
+; CHECK-LABEL: Sturb_zero
+; CHECK: sturh wzr
+define void @Sturb_zero(i8* nocapture %P, i32 %n) #0 {
+entry:
+ %sub = add nsw i32 %n, -2
+ %idxprom = sext i32 %sub to i64
+ %arrayidx = getelementptr inbounds i8, i8* %P, i64 %idxprom
+ store i8 0, i8* %arrayidx
+ %sub2= add nsw i32 %n, -1
+ %idxprom1 = sext i32 %sub2 to i64
+ %arrayidx2 = getelementptr inbounds i8, i8* %P, i64 %idxprom1
+ store i8 0, i8* %arrayidx2
+ ret void
+}
+
+; CHECK-LABEL: Sturh_zero
+; CHECK: stur wzr
+define void @Sturh_zero(i16* nocapture %P, i32 %n) {
+entry:
+ %sub = add nsw i32 %n, -2
+ %idxprom = sext i32 %sub to i64
+ %arrayidx = getelementptr inbounds i16, i16* %P, i64 %idxprom
+ store i16 0, i16* %arrayidx
+ %sub1 = add nsw i32 %n, -3
+ %idxprom2 = sext i32 %sub1 to i64
+ %arrayidx3 = getelementptr inbounds i16, i16* %P, i64 %idxprom2
+ store i16 0, i16* %arrayidx3
+ ret void
+}
+
+; CHECK-LABEL: Sturh_zero_4
+; CHECK: stp wzr, wzr
+define void @Sturh_zero_4(i16* nocapture %P, i32 %n) {
+entry:
+ %sub = add nsw i32 %n, -3
+ %idxprom = sext i32 %sub to i64
+ %arrayidx = getelementptr inbounds i16, i16* %P, i64 %idxprom
+ store i16 0, i16* %arrayidx
+ %sub1 = add nsw i32 %n, -4
+ %idxprom2 = sext i32 %sub1 to i64
+ %arrayidx3 = getelementptr inbounds i16, i16* %P, i64 %idxprom2
+ store i16 0, i16* %arrayidx3
+ %sub4 = add nsw i32 %n, -2
+ %idxprom5 = sext i32 %sub4 to i64
+ %arrayidx6 = getelementptr inbounds i16, i16* %P, i64 %idxprom5
+ store i16 0, i16* %arrayidx6
+ %sub7 = add nsw i32 %n, -1
+ %idxprom8 = sext i32 %sub7 to i64
+ %arrayidx9 = getelementptr inbounds i16, i16* %P, i64 %idxprom8
+ store i16 0, i16* %arrayidx9
+ ret void
+}