bypass-slow-division-tune.ll
8.67 KB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; Check that a division is bypassed when appropriate only.
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=atom < %s | FileCheck -check-prefixes=CHECK,ATOM %s
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=x86-64 < %s | FileCheck -check-prefixes=CHECK,REST,X64 %s
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=silvermont < %s | FileCheck -check-prefixes=CHECK,REST,SLM %s
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mcpu=skylake < %s | FileCheck -check-prefixes=CHECK,REST,SKL %s
; RUN: llc -profile-summary-huge-working-set-size-threshold=1 -mtriple=x86_64-unknown-linux-gnu -mcpu=skylake < %s | FileCheck -check-prefixes=HUGEWS %s
; Verify that div32 is bypassed only for Atoms.
define i32 @div32(i32 %a, i32 %b) {
; ATOM-LABEL: div32:
; ATOM: # %bb.0: # %entry
; ATOM-NEXT: movl %edi, %eax
; ATOM-NEXT: orl %esi, %eax
; ATOM-NEXT: testl $-256, %eax
; ATOM-NEXT: je .LBB0_1
; ATOM-NEXT: # %bb.2:
; ATOM-NEXT: movl %edi, %eax
; ATOM-NEXT: cltd
; ATOM-NEXT: idivl %esi
; ATOM-NEXT: retq
; ATOM-NEXT: .LBB0_1:
; ATOM-NEXT: movzbl %dil, %eax
; ATOM-NEXT: divb %sil
; ATOM-NEXT: movzbl %al, %eax
; ATOM-NEXT: retq
;
; REST-LABEL: div32:
; REST: # %bb.0: # %entry
; REST-NEXT: movl %edi, %eax
; REST-NEXT: cltd
; REST-NEXT: idivl %esi
; REST-NEXT: retq
;
; HUGEWS-LABEL: div32:
; HUGEWS: # %bb.0: # %entry
; HUGEWS-NEXT: movl %edi, %eax
; HUGEWS-NEXT: cltd
; HUGEWS-NEXT: idivl %esi
; HUGEWS-NEXT: retq
entry:
%div = sdiv i32 %a, %b
ret i32 %div
}
; Verify that div64 is always bypassed.
define i64 @div64(i64 %a, i64 %b) {
; ATOM-LABEL: div64:
; ATOM: # %bb.0: # %entry
; ATOM-NEXT: movq %rdi, %rcx
; ATOM-NEXT: movq %rdi, %rax
; ATOM-NEXT: orq %rsi, %rcx
; ATOM-NEXT: shrq $32, %rcx
; ATOM-NEXT: je .LBB1_1
; ATOM-NEXT: # %bb.2:
; ATOM-NEXT: cqto
; ATOM-NEXT: idivq %rsi
; ATOM-NEXT: retq
; ATOM-NEXT: .LBB1_1:
; ATOM-NEXT: # kill: def $eax killed $eax killed $rax
; ATOM-NEXT: xorl %edx, %edx
; ATOM-NEXT: divl %esi
; ATOM-NEXT: # kill: def $eax killed $eax def $rax
; ATOM-NEXT: retq
;
; X64-LABEL: div64:
; X64: # %bb.0: # %entry
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: movq %rdi, %rcx
; X64-NEXT: orq %rsi, %rcx
; X64-NEXT: shrq $32, %rcx
; X64-NEXT: je .LBB1_1
; X64-NEXT: # %bb.2:
; X64-NEXT: cqto
; X64-NEXT: idivq %rsi
; X64-NEXT: retq
; X64-NEXT: .LBB1_1:
; X64-NEXT: # kill: def $eax killed $eax killed $rax
; X64-NEXT: xorl %edx, %edx
; X64-NEXT: divl %esi
; X64-NEXT: # kill: def $eax killed $eax def $rax
; X64-NEXT: retq
;
; SLM-LABEL: div64:
; SLM: # %bb.0: # %entry
; SLM-NEXT: movq %rdi, %rcx
; SLM-NEXT: movq %rdi, %rax
; SLM-NEXT: orq %rsi, %rcx
; SLM-NEXT: shrq $32, %rcx
; SLM-NEXT: je .LBB1_1
; SLM-NEXT: # %bb.2:
; SLM-NEXT: cqto
; SLM-NEXT: idivq %rsi
; SLM-NEXT: retq
; SLM-NEXT: .LBB1_1:
; SLM-NEXT: xorl %edx, %edx
; SLM-NEXT: # kill: def $eax killed $eax killed $rax
; SLM-NEXT: divl %esi
; SLM-NEXT: # kill: def $eax killed $eax def $rax
; SLM-NEXT: retq
;
; SKL-LABEL: div64:
; SKL: # %bb.0: # %entry
; SKL-NEXT: movq %rdi, %rax
; SKL-NEXT: movq %rdi, %rcx
; SKL-NEXT: orq %rsi, %rcx
; SKL-NEXT: shrq $32, %rcx
; SKL-NEXT: je .LBB1_1
; SKL-NEXT: # %bb.2:
; SKL-NEXT: cqto
; SKL-NEXT: idivq %rsi
; SKL-NEXT: retq
; SKL-NEXT: .LBB1_1:
; SKL-NEXT: # kill: def $eax killed $eax killed $rax
; SKL-NEXT: xorl %edx, %edx
; SKL-NEXT: divl %esi
; SKL-NEXT: # kill: def $eax killed $eax def $rax
; SKL-NEXT: retq
;
; HUGEWS-LABEL: div64:
; HUGEWS: # %bb.0: # %entry
; HUGEWS-NEXT: movq %rdi, %rax
; HUGEWS-NEXT: cqto
; HUGEWS-NEXT: idivq %rsi
; HUGEWS-NEXT: retq
entry:
%div = sdiv i64 %a, %b
ret i64 %div
}
; Verify that no extra code is generated when optimizing for size.
define i64 @div64_optsize(i64 %a, i64 %b) optsize {
; CHECK-LABEL: div64_optsize:
; CHECK: # %bb.0:
; CHECK-NEXT: movq %rdi, %rax
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %rsi
; CHECK-NEXT: retq
;
; HUGEWS-LABEL: div64_optsize:
; HUGEWS: # %bb.0:
; HUGEWS-NEXT: movq %rdi, %rax
; HUGEWS-NEXT: cqto
; HUGEWS-NEXT: idivq %rsi
; HUGEWS-NEXT: retq
%div = sdiv i64 %a, %b
ret i64 %div
}
define i64 @div64_pgso(i64 %a, i64 %b) !prof !15 {
; CHECK-LABEL: div64_pgso:
; CHECK: # %bb.0:
; CHECK-NEXT: movq %rdi, %rax
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %rsi
; CHECK-NEXT: retq
;
; HUGEWS-LABEL: div64_pgso:
; HUGEWS: # %bb.0:
; HUGEWS-NEXT: movq %rdi, %rax
; HUGEWS-NEXT: cqto
; HUGEWS-NEXT: idivq %rsi
; HUGEWS-NEXT: retq
%div = sdiv i64 %a, %b
ret i64 %div
}
define i64 @div64_hugews(i64 %a, i64 %b) {
; ATOM-LABEL: div64_hugews:
; ATOM: # %bb.0:
; ATOM-NEXT: movq %rdi, %rcx
; ATOM-NEXT: movq %rdi, %rax
; ATOM-NEXT: orq %rsi, %rcx
; ATOM-NEXT: shrq $32, %rcx
; ATOM-NEXT: je .LBB4_1
; ATOM-NEXT: # %bb.2:
; ATOM-NEXT: cqto
; ATOM-NEXT: idivq %rsi
; ATOM-NEXT: retq
; ATOM-NEXT: .LBB4_1:
; ATOM-NEXT: # kill: def $eax killed $eax killed $rax
; ATOM-NEXT: xorl %edx, %edx
; ATOM-NEXT: divl %esi
; ATOM-NEXT: # kill: def $eax killed $eax def $rax
; ATOM-NEXT: retq
;
; X64-LABEL: div64_hugews:
; X64: # %bb.0:
; X64-NEXT: movq %rdi, %rax
; X64-NEXT: movq %rdi, %rcx
; X64-NEXT: orq %rsi, %rcx
; X64-NEXT: shrq $32, %rcx
; X64-NEXT: je .LBB4_1
; X64-NEXT: # %bb.2:
; X64-NEXT: cqto
; X64-NEXT: idivq %rsi
; X64-NEXT: retq
; X64-NEXT: .LBB4_1:
; X64-NEXT: # kill: def $eax killed $eax killed $rax
; X64-NEXT: xorl %edx, %edx
; X64-NEXT: divl %esi
; X64-NEXT: # kill: def $eax killed $eax def $rax
; X64-NEXT: retq
;
; SLM-LABEL: div64_hugews:
; SLM: # %bb.0:
; SLM-NEXT: movq %rdi, %rcx
; SLM-NEXT: movq %rdi, %rax
; SLM-NEXT: orq %rsi, %rcx
; SLM-NEXT: shrq $32, %rcx
; SLM-NEXT: je .LBB4_1
; SLM-NEXT: # %bb.2:
; SLM-NEXT: cqto
; SLM-NEXT: idivq %rsi
; SLM-NEXT: retq
; SLM-NEXT: .LBB4_1:
; SLM-NEXT: xorl %edx, %edx
; SLM-NEXT: # kill: def $eax killed $eax killed $rax
; SLM-NEXT: divl %esi
; SLM-NEXT: # kill: def $eax killed $eax def $rax
; SLM-NEXT: retq
;
; SKL-LABEL: div64_hugews:
; SKL: # %bb.0:
; SKL-NEXT: movq %rdi, %rax
; SKL-NEXT: movq %rdi, %rcx
; SKL-NEXT: orq %rsi, %rcx
; SKL-NEXT: shrq $32, %rcx
; SKL-NEXT: je .LBB4_1
; SKL-NEXT: # %bb.2:
; SKL-NEXT: cqto
; SKL-NEXT: idivq %rsi
; SKL-NEXT: retq
; SKL-NEXT: .LBB4_1:
; SKL-NEXT: # kill: def $eax killed $eax killed $rax
; SKL-NEXT: xorl %edx, %edx
; SKL-NEXT: divl %esi
; SKL-NEXT: # kill: def $eax killed $eax def $rax
; SKL-NEXT: retq
;
; HUGEWS-LABEL: div64_hugews:
; HUGEWS: # %bb.0:
; HUGEWS-NEXT: movq %rdi, %rax
; HUGEWS-NEXT: cqto
; HUGEWS-NEXT: idivq %rsi
; HUGEWS-NEXT: retq
%div = sdiv i64 %a, %b
ret i64 %div
}
define i32 @div32_optsize(i32 %a, i32 %b) optsize {
; CHECK-LABEL: div32_optsize:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %esi
; CHECK-NEXT: retq
;
; HUGEWS-LABEL: div32_optsize:
; HUGEWS: # %bb.0:
; HUGEWS-NEXT: movl %edi, %eax
; HUGEWS-NEXT: cltd
; HUGEWS-NEXT: idivl %esi
; HUGEWS-NEXT: retq
%div = sdiv i32 %a, %b
ret i32 %div
}
define i32 @div32_pgso(i32 %a, i32 %b) !prof !15 {
; CHECK-LABEL: div32_pgso:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %esi
; CHECK-NEXT: retq
;
; HUGEWS-LABEL: div32_pgso:
; HUGEWS: # %bb.0:
; HUGEWS-NEXT: movl %edi, %eax
; HUGEWS-NEXT: cltd
; HUGEWS-NEXT: idivl %esi
; HUGEWS-NEXT: retq
%div = sdiv i32 %a, %b
ret i32 %div
}
define i32 @div32_minsize(i32 %a, i32 %b) minsize {
; CHECK-LABEL: div32_minsize:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %esi
; CHECK-NEXT: retq
;
; HUGEWS-LABEL: div32_minsize:
; HUGEWS: # %bb.0:
; HUGEWS-NEXT: movl %edi, %eax
; HUGEWS-NEXT: cltd
; HUGEWS-NEXT: idivl %esi
; HUGEWS-NEXT: retq
%div = sdiv i32 %a, %b
ret i32 %div
}
!llvm.module.flags = !{!1}
!1 = !{i32 1, !"ProfileSummary", !2}
!2 = !{!3, !4, !5, !6, !7, !8, !9, !10}
!3 = !{!"ProfileFormat", !"InstrProf"}
!4 = !{!"TotalCount", i64 10000}
!5 = !{!"MaxCount", i64 1000}
!6 = !{!"MaxInternalCount", i64 1}
!7 = !{!"MaxFunctionCount", i64 1000}
!8 = !{!"NumCounts", i64 3}
!9 = !{!"NumFunctions", i64 3}
!10 = !{!"DetailedSummary", !11}
!11 = !{!12, !13, !14}
!12 = !{i32 10000, i64 1000, i32 1}
!13 = !{i32 999000, i64 1000, i32 3}
!14 = !{i32 999999, i64 5, i32 3}
!15 = !{!"function_entry_count", i64 0}