1; NOTE: Assertions have been autogenerated by utils/update_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.
9define 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;
18  store i64 -1, i64* %b, align 8
19  %cmp = icmp eq i64 %a, -1
20  ret i1 %cmp
21}
22
23declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
24
25; Inlined memsets requiring multiple same-sized stores should be lowered using
26; the register, rather than immediate, form of stores when optimizing for
27; code size.
28define void @memset_zero(i8* noalias nocapture %D) optsize {
29; CHECK-LABEL: memset_zero:
30; CHECK:       # BB#0:
31; CHECK-NEXT:    xorl %eax, %eax
32; CHECK-NEXT:    movq %rax, 7(%rdi)
33; CHECK-NEXT:    movq %rax, (%rdi)
34; CHECK-NEXT:    retq
35;
36  tail call void @llvm.memset.p0i8.i64(i8* %D, i8 0, i64 15, i32 1, i1 false)
37  ret void
38}
39