Idx == 1)
return 0;
- if (Opcode == Instruction::And)
- // Conversion to BIC is free, and means we can use ~Imm instead.
- return std::min(getIntImmCost(Imm, Ty), getIntImmCost(~Imm, Ty));
+ if (Opcode == Instruction::And) {
+ // UXTB/UXTH
+ if (Imm == 255 || Imm == 65535)
+ return 0;
+ // Conversion to BIC is free, and means we can use ~Imm instead.
+ return std::min(getIntImmCost(Imm, Ty), getIntImmCost(~Imm, Ty));
+ }
if (Opcode == Instruction::Add)
// Conversion to SUB is free, and means we can use -Imm instead.
define void @uxth_loop_2(i32* %a, i32 %n) {
; V6M-LABEL: uxth_loop_2:
-; V6M: .save {r4, r5, r7, lr}
-; V6M-NEXT: push {r4, r5, r7, lr}
-; V6M-NEXT: movs r3, #0
-; V6M-NEXT: ldr r2, .LCPI5_0
+; V6M: .save {r4, lr}
+; V6M-NEXT: push {r4, lr}
+; V6M-NEXT: movs r2, #0
; V6M-NEXT: .LBB5_1:
-; V6M-NEXT: adds r4, r3, #1
-; V6M-NEXT: ands r3, r2
-; V6M-NEXT: ldr r5, [r0]
-; V6M-NEXT: ands r5, r2
-; V6M-NEXT: muls r5, r3, r5
-; V6M-NEXT: stm r0!, {r5}
-; V6M-NEXT: cmp r1, r4
-; V6M-NEXT: mov r3, r4
+; V6M-NEXT: uxth r3, r2
+; V6M-NEXT: ldrh r4, [r0]
+; V6M-NEXT: muls r4, r3, r4
+; V6M-NEXT: stm r0!, {r4}
+; V6M-NEXT: adds r2, r2, #1
+; V6M-NEXT: cmp r1, r2
; V6M-NEXT: bne .LBB5_1
-; V6M-NEXT: pop {r4, r5, r7, pc}
-; V6M-NEXT: .p2align 2
-; V6M-NEXT: .LCPI5_0:
-; V6M-NEXT: .long 65535
+; V6M-NEXT: pop {r4, pc}
entry:
br label %for.body