1 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2 ; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s 3 4 ; Check that multiple instances of 64-bit constants encodable as 5 ; 32-bit immediates are merged for code size savings. 6 7 ; Immediates with multiple users should not be pulled into instructions when 8 ; optimizing for code size. 9 define i1 @imm_multiple_users(i64 %a, i64* %b) optsize { 10 ; CHECK-LABEL: imm_multiple_users: 11 ; CHECK: # %bb.0: 12 ; CHECK-NEXT: movq $-1, %rax 13 ; CHECK-NEXT: movq %rax, (%rsi) 14 ; CHECK-NEXT: cmpq %rax, %rdi 15 ; CHECK-NEXT: sete %al 16 ; CHECK-NEXT: retq 17 store i64 -1, i64* %b, align 8 18 %cmp = icmp eq i64 %a, -1 19 ret i1 %cmp 20 } 21 22 declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) 23 24 ; Inlined memsets requiring multiple same-sized stores should be lowered using 25 ; the register, rather than immediate, form of stores when optimizing for 26 ; code size. 27 define void @memset_zero(i8* noalias nocapture %D) optsize { 28 ; CHECK-LABEL: memset_zero: 29 ; CHECK: # %bb.0: 30 ; CHECK-NEXT: xorl %eax, %eax 31 ; CHECK-NEXT: movq %rax, 7(%rdi) 32 ; CHECK-NEXT: movq %rax, (%rdi) 33 ; CHECK-NEXT: retq 34 tail call void @llvm.memset.p0i8.i64(i8* %D, i8 0, i64 15, i1 false) 35 ret void 36 } 37
