shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
llvm-project/llvm/test/CodeGen/AArch64/csr-split.ll
Guozhi Wei cbdccb30c2 [RA] Split a virtual register in cold blocks if it is not assigned preferred physical register 
If a virtual register is not assigned preferred physical register, it means some
COPY instructions will be changed to real register move instructions. In this
case we can try to split the virtual register in colder blocks, if success, the
original COPY instructions can be deleted, and the new COPY instructions in
colder blocks will be generated as register move instructions. It results in
fewer dynamic register move instructions executed.

The new test case split-reg-with-hint.ll gives an example, the hot path contains
24 instructions without this patch, now it is only 4 instructions with this
patch.

Differential Revision: https://reviews.llvm.org/D156491
2023-09-15 19:52:50 +00:00

244 lines
8.9 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -verify-machineinstrs -mtriple=aarch64-unknown-linux < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -mtriple=arm64-apple-ios < %s | FileCheck %s --check-prefix=CHECK-APPLE
; Check CSR split can work properly for tests below.
@a = common dso_local local_unnamed_addr global i32 0, align 4
define dso_local signext i32 @test1(ptr %b) local_unnamed_addr uwtable {
; CHECK-LABEL: test1:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: adrp x8, a
; CHECK-NEXT: ldrsw x8, [x8, :lo12:a]
; CHECK-NEXT: cmp x8, x0
; CHECK-NEXT: b.eq .LBB0_2
; CHECK-NEXT: // %bb.1: // %if.end
; CHECK-NEXT: ret
; CHECK-NEXT: .LBB0_2: // %if.then
; CHECK-NEXT: stp x30, x19, [sp, #-16]! // 16-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w19, -8
; CHECK-NEXT: .cfi_offset w30, -16
; CHECK-NEXT: mov x19, x0
; CHECK-NEXT: bl callVoid
; CHECK-NEXT: mov x0, x19
; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload
; CHECK-NEXT: .cfi_def_cfa_offset 0
; CHECK-NEXT: .cfi_restore w19
; CHECK-NEXT: .cfi_restore w30
; CHECK-NEXT: b callNonVoid
;
; CHECK-APPLE-LABEL: test1:
; CHECK-APPLE: ; %bb.0: ; %entry
; CHECK-APPLE-NEXT: Lloh0:
; CHECK-APPLE-NEXT: adrp x8, _a@PAGE
; CHECK-APPLE-NEXT: Lloh1:
; CHECK-APPLE-NEXT: ldrsw x8, [x8, _a@PAGEOFF]
; CHECK-APPLE-NEXT: cmp x8, x0
; CHECK-APPLE-NEXT: b.eq LBB0_2
; CHECK-APPLE-NEXT: ; %bb.1: ; %if.end
; CHECK-APPLE-NEXT: ret
; CHECK-APPLE-NEXT: LBB0_2: ; %if.then
; CHECK-APPLE-NEXT: stp x20, x19, [sp, #-32]! ; 16-byte Folded Spill
; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 32
; CHECK-APPLE-NEXT: stp x29, x30, [sp, #16] ; 16-byte Folded Spill
; CHECK-APPLE-NEXT: .cfi_offset w30, -8
; CHECK-APPLE-NEXT: .cfi_offset w29, -16
; CHECK-APPLE-NEXT: .cfi_offset w19, -24
; CHECK-APPLE-NEXT: .cfi_offset w20, -32
; CHECK-APPLE-NEXT: mov x19, x0
; CHECK-APPLE-NEXT: bl _callVoid
; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
; CHECK-APPLE-NEXT: mov x0, x19
; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 0
; CHECK-APPLE-NEXT: .cfi_restore w30
; CHECK-APPLE-NEXT: .cfi_restore w29
; CHECK-APPLE-NEXT: .cfi_restore w19
; CHECK-APPLE-NEXT: .cfi_restore w20
; CHECK-APPLE-NEXT: b _callNonVoid
; CHECK-APPLE-NEXT: .loh AdrpLdr Lloh0, Lloh1
entry:
%0 = load i32, ptr @a, align 4, !tbaa !2
%conv = sext i32 %0 to i64
%1 = inttoptr i64 %conv to ptr
%cmp = icmp eq ptr %1, %b
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call = tail call signext i32 @callVoid()
%call2 = tail call signext i32 @callNonVoid(ptr %b)
br label %if.end
if.end: ; preds = %if.then, %entry
%retval.0 = phi i32 [ %call2, %if.then ], [ undef, %entry ]
ret i32 %retval.0
}
declare signext i32 @callVoid(...) local_unnamed_addr
declare signext i32 @callNonVoid(ptr) local_unnamed_addr
define dso_local signext i32 @test2(ptr %p1) local_unnamed_addr uwtable {
; CHECK-LABEL: test2:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: cbz x0, .LBB1_3
; CHECK-NEXT: // %bb.1: // %entry
; CHECK-NEXT: adrp x8, a
; CHECK-NEXT: ldrsw x8, [x8, :lo12:a]
; CHECK-NEXT: cmp x8, x0
; CHECK-NEXT: b.ne .LBB1_3
; CHECK-NEXT: // %bb.2: // %if.then2
; CHECK-NEXT: stp x30, x19, [sp, #-16]! // 16-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: .cfi_offset w19, -8
; CHECK-NEXT: .cfi_offset w30, -16
; CHECK-NEXT: mov x19, x0
; CHECK-NEXT: bl callVoid
; CHECK-NEXT: mov x0, x19
; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload
; CHECK-NEXT: .cfi_def_cfa_offset 0
; CHECK-NEXT: .cfi_restore w19
; CHECK-NEXT: .cfi_restore w30
; CHECK-NEXT: b callNonVoid
; CHECK-NEXT: .LBB1_3: // %return
; CHECK-NEXT: mov w0, wzr
; CHECK-NEXT: ret
;
; CHECK-APPLE-LABEL: test2:
; CHECK-APPLE: ; %bb.0: ; %entry
; CHECK-APPLE-NEXT: cbz x0, LBB1_3
; CHECK-APPLE-NEXT: ; %bb.1: ; %entry
; CHECK-APPLE-NEXT: Lloh2:
; CHECK-APPLE-NEXT: adrp x8, _a@PAGE
; CHECK-APPLE-NEXT: Lloh3:
; CHECK-APPLE-NEXT: ldrsw x8, [x8, _a@PAGEOFF]
; CHECK-APPLE-NEXT: cmp x8, x0
; CHECK-APPLE-NEXT: b.ne LBB1_3
; CHECK-APPLE-NEXT: ; %bb.2: ; %if.then2
; CHECK-APPLE-NEXT: stp x20, x19, [sp, #-32]! ; 16-byte Folded Spill
; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 32
; CHECK-APPLE-NEXT: stp x29, x30, [sp, #16] ; 16-byte Folded Spill
; CHECK-APPLE-NEXT: .cfi_offset w30, -8
; CHECK-APPLE-NEXT: .cfi_offset w29, -16
; CHECK-APPLE-NEXT: .cfi_offset w19, -24
; CHECK-APPLE-NEXT: .cfi_offset w20, -32
; CHECK-APPLE-NEXT: mov x19, x0
; CHECK-APPLE-NEXT: bl _callVoid
; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
; CHECK-APPLE-NEXT: mov x0, x19
; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 0
; CHECK-APPLE-NEXT: .cfi_restore w30
; CHECK-APPLE-NEXT: .cfi_restore w29
; CHECK-APPLE-NEXT: .cfi_restore w19
; CHECK-APPLE-NEXT: .cfi_restore w20
; CHECK-APPLE-NEXT: b _callNonVoid
; CHECK-APPLE-NEXT: LBB1_3: ; %return
; CHECK-APPLE-NEXT: mov w0, wzr
; CHECK-APPLE-NEXT: ret
; CHECK-APPLE-NEXT: .loh AdrpLdr Lloh2, Lloh3
entry:
%tobool = icmp eq ptr %p1, null
br i1 %tobool, label %return, label %if.end
if.end: ; preds = %entry
%0 = load i32, ptr @a, align 4, !tbaa !2
%conv = sext i32 %0 to i64
%1 = inttoptr i64 %conv to ptr
%cmp = icmp eq ptr %1, %p1
br i1 %cmp, label %if.then2, label %return
if.then2: ; preds = %if.end
%call = tail call signext i32 @callVoid()
%call3 = tail call signext i32 @callNonVoid(ptr nonnull %p1)
br label %return
return: ; preds = %if.end, %entry, %if.then2
%retval.0 = phi i32 [ %call3, %if.then2 ], [ 0, %entry ], [ 0, %if.end ]
ret i32 %retval.0
}
define dso_local ptr @test3(ptr nocapture %p1, i8 zeroext %p2) local_unnamed_addr uwtable {
; CHECK-LABEL: test3:
; CHECK: // %bb.0: // %entry
; CHECK-NEXT: str x30, [sp, #-32]! // 8-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 32
; CHECK-NEXT: stp x20, x19, [sp, #16] // 16-byte Folded Spill
; CHECK-NEXT: .cfi_offset w19, -8
; CHECK-NEXT: .cfi_offset w20, -16
; CHECK-NEXT: .cfi_offset w30, -32
; CHECK-NEXT: ldr x19, [x0]
; CHECK-NEXT: cbz x19, .LBB2_2
; CHECK-NEXT: // %bb.1: // %land.rhs
; CHECK-NEXT: mov x20, x0
; CHECK-NEXT: mov x0, x19
; CHECK-NEXT: bl bar
; CHECK-NEXT: str x0, [x20]
; CHECK-NEXT: .LBB2_2: // %land.end
; CHECK-NEXT: mov x0, x19
; CHECK-NEXT: ldp x20, x19, [sp, #16] // 16-byte Folded Reload
; CHECK-NEXT: ldr x30, [sp], #32 // 8-byte Folded Reload
; CHECK-NEXT: .cfi_def_cfa_offset 0
; CHECK-NEXT: .cfi_restore w19
; CHECK-NEXT: .cfi_restore w20
; CHECK-NEXT: .cfi_restore w30
; CHECK-NEXT: ret
;
; CHECK-APPLE-LABEL: test3:
; CHECK-APPLE: ; %bb.0: ; %entry
; CHECK-APPLE-NEXT: stp x20, x19, [sp, #-32]! ; 16-byte Folded Spill
; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 32
; CHECK-APPLE-NEXT: stp x29, x30, [sp, #16] ; 16-byte Folded Spill
; CHECK-APPLE-NEXT: .cfi_offset w30, -8
; CHECK-APPLE-NEXT: .cfi_offset w29, -16
; CHECK-APPLE-NEXT: .cfi_offset w19, -24
; CHECK-APPLE-NEXT: .cfi_offset w20, -32
; CHECK-APPLE-NEXT: ldr x19, [x0]
; CHECK-APPLE-NEXT: cbz x19, LBB2_2
; CHECK-APPLE-NEXT: ; %bb.1: ; %land.rhs
; CHECK-APPLE-NEXT: mov x20, x0
; CHECK-APPLE-NEXT: mov x0, x19
; CHECK-APPLE-NEXT: bl _bar
; CHECK-APPLE-NEXT: str x0, [x20]
; CHECK-APPLE-NEXT: LBB2_2: ; %land.end
; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
; CHECK-APPLE-NEXT: mov x0, x19
; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 0
; CHECK-APPLE-NEXT: .cfi_restore w30
; CHECK-APPLE-NEXT: .cfi_restore w29
; CHECK-APPLE-NEXT: .cfi_restore w19
; CHECK-APPLE-NEXT: .cfi_restore w20
; CHECK-APPLE-NEXT: ret
entry:
%0 = load ptr, ptr %p1, align 8, !tbaa !6
%tobool = icmp eq ptr %0, null
br i1 %tobool, label %land.end, label %land.rhs
land.rhs: ; preds = %entry
%call = tail call ptr @bar(ptr nonnull %0, i8 zeroext %p2)
store ptr %call, ptr %p1, align 8, !tbaa !6
br label %land.end
land.end: ; preds = %entry, %land.rhs
ret ptr %0
}
declare ptr @bar(ptr, i8 zeroext) local_unnamed_addr
!llvm.module.flags = !{!0}
!llvm.ident = !{!1}
!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{!"clang version 10.0.0 (trunk 367381) (llvm/trunk 367388)"}
!2 = !{!3, !3, i64 0}
!3 = !{!"int", !4, i64 0}
!4 = !{!"omnipotent char", !5, i64 0}
!5 = !{!"Simple C/C++ TBAA"}
!6 = !{!7, !7, i64 0}
!7 = !{!"any pointer", !4, i64 0}
Reference in New Issue View Git Blame Copy Permalink