immediate_merging64.ll
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
; Check that multiple instances of 64-bit constants encodable as
; 32-bit immediates are merged for code size savings.
; Immediates with multiple users should not be pulled into instructions when
; optimizing for code size (but 8-bit immediates are exceptions).
define i1 @imm_multiple_users(i64 %a, i64* %b) optsize {
; CHECK-LABEL: imm_multiple_users:
; CHECK: # %bb.0:
; CHECK-NEXT: movq $-1, (%rsi)
; CHECK-NEXT: cmpq $-1, %rdi
; CHECK-NEXT: sete %al
; CHECK-NEXT: retq
store i64 -1, i64* %b, align 8
%cmp = icmp eq i64 %a, -1
ret i1 %cmp
}
define i1 @imm_multiple_users_pgso(i64 %a, i64* %b) !prof !14 {
; CHECK-LABEL: imm_multiple_users_pgso:
; CHECK: # %bb.0:
; CHECK-NEXT: movq $-1, (%rsi)
; CHECK-NEXT: cmpq $-1, %rdi
; CHECK-NEXT: sete %al
; CHECK-NEXT: retq
store i64 -1, i64* %b, align 8
%cmp = icmp eq i64 %a, -1
ret i1 %cmp
}
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1)
; Inlined memsets requiring multiple same-sized stores should be lowered using
; the register, rather than immediate, form of stores when optimizing for
; code size.
define void @memset_zero(i8* noalias nocapture %D) optsize {
; CHECK-LABEL: memset_zero:
; CHECK: # %bb.0:
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: movq %rax, 7(%rdi)
; CHECK-NEXT: movq %rax, (%rdi)
; CHECK-NEXT: retq
tail call void @llvm.memset.p0i8.i64(i8* %D, i8 0, i64 15, i1 false)
ret void
}
define void @memset_zero_pgso(i8* noalias nocapture %D) !prof !14 {
; CHECK-LABEL: memset_zero_pgso:
; CHECK: # %bb.0:
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: movq %rax, 7(%rdi)
; CHECK-NEXT: movq %rax, (%rdi)
; CHECK-NEXT: retq
tail call void @llvm.memset.p0i8.i64(i8* %D, i8 0, i64 15, i1 false)
ret void
}
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"ProfileSummary", !1}
!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
!2 = !{!"ProfileFormat", !"InstrProf"}
!3 = !{!"TotalCount", i64 10000}
!4 = !{!"MaxCount", i64 10}
!5 = !{!"MaxInternalCount", i64 1}
!6 = !{!"MaxFunctionCount", i64 1000}
!7 = !{!"NumCounts", i64 3}
!8 = !{!"NumFunctions", i64 3}
!9 = !{!"DetailedSummary", !10}
!10 = !{!11, !12, !13}
!11 = !{i32 10000, i64 100, i32 1}
!12 = !{i32 999000, i64 100, i32 1}
!13 = !{i32 999999, i64 1, i32 2}
!14 = !{!"function_entry_count", i64 0}