e7249e4acf
When determining whether to fold branches to a common destination by merging two blocks, SimplifyCFG will count the number of instructions to be moved into the first basic block. However, there's no reason to count free instructions like bitcasts and other similar instructions. This resolves missed branch foldings with -fstrict-vtable-pointers in llvm-test-suite's lambda benchmark. Reviewed By: spatel Differential Revision: https://reviews.llvm.org/D108837
225 lines
8.4 KiB
LLVM
225 lines
8.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -verify-machineinstrs -mtriple=aarch64-unknown-linux < %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -mtriple=arm64-apple-ios < %s | FileCheck %s --check-prefix=CHECK-APPLE
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; Check CSR split can work properly for tests below.
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@a = common dso_local local_unnamed_addr global i32 0, align 4
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define dso_local signext i32 @test1(i32* %b) local_unnamed_addr {
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; CHECK-LABEL: test1:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: stp x30, x19, [sp, #-16]! // 16-byte Folded Spill
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset w19, -8
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; CHECK-NEXT: .cfi_offset w30, -16
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; CHECK-NEXT: adrp x8, a
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; CHECK-NEXT: ldrsw x8, [x8, :lo12:a]
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; CHECK-NEXT: cmp x8, x0
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; CHECK-NEXT: b.eq .LBB0_2
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; CHECK-NEXT: // %bb.1: // %if.end
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; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB0_2: // %if.then
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; CHECK-NEXT: mov x19, x0
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; CHECK-NEXT: bl callVoid
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; CHECK-NEXT: mov x0, x19
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; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload
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; CHECK-NEXT: b callNonVoid
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;
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; CHECK-APPLE-LABEL: test1:
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; CHECK-APPLE: ; %bb.0: ; %entry
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; CHECK-APPLE-NEXT: stp x20, x19, [sp, #-32]! ; 16-byte Folded Spill
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; CHECK-APPLE-NEXT: stp x29, x30, [sp, #16] ; 16-byte Folded Spill
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; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 32
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; CHECK-APPLE-NEXT: .cfi_offset w30, -8
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; CHECK-APPLE-NEXT: .cfi_offset w29, -16
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; CHECK-APPLE-NEXT: .cfi_offset w19, -24
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; CHECK-APPLE-NEXT: .cfi_offset w20, -32
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; CHECK-APPLE-NEXT: Lloh0:
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; CHECK-APPLE-NEXT: adrp x8, _a@PAGE
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; CHECK-APPLE-NEXT: Lloh1:
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; CHECK-APPLE-NEXT: ldrsw x8, [x8, _a@PAGEOFF]
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; CHECK-APPLE-NEXT: cmp x8, x0
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; CHECK-APPLE-NEXT: b.eq LBB0_2
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; CHECK-APPLE-NEXT: ; %bb.1: ; %if.end
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; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: ret
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; CHECK-APPLE-NEXT: LBB0_2: ; %if.then
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; CHECK-APPLE-NEXT: mov x19, x0
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; CHECK-APPLE-NEXT: bl _callVoid
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; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: mov x0, x19
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; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: b _callNonVoid
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; CHECK-APPLE-NEXT: .loh AdrpLdr Lloh0, Lloh1
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entry:
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%0 = load i32, i32* @a, align 4, !tbaa !2
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%conv = sext i32 %0 to i64
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%1 = inttoptr i64 %conv to i32*
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%cmp = icmp eq i32* %1, %b
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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%call = tail call signext i32 bitcast (i32 (...)* @callVoid to i32 ()*)()
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%call2 = tail call signext i32 @callNonVoid(i32* %b)
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%retval.0 = phi i32 [ %call2, %if.then ], [ undef, %entry ]
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ret i32 %retval.0
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}
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declare signext i32 @callVoid(...) local_unnamed_addr
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declare signext i32 @callNonVoid(i32*) local_unnamed_addr
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define dso_local signext i32 @test2(i32* %p1) local_unnamed_addr {
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; CHECK-LABEL: test2:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: stp x30, x19, [sp, #-16]! // 16-byte Folded Spill
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset w19, -8
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; CHECK-NEXT: .cfi_offset w30, -16
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; CHECK-NEXT: cbz x0, .LBB1_3
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; CHECK-NEXT: // %bb.1: // %entry
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; CHECK-NEXT: adrp x8, a
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; CHECK-NEXT: ldrsw x8, [x8, :lo12:a]
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; CHECK-NEXT: mov x19, x0
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; CHECK-NEXT: cmp x8, x0
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; CHECK-NEXT: b.ne .LBB1_3
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; CHECK-NEXT: // %bb.2: // %if.then2
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; CHECK-NEXT: bl callVoid
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; CHECK-NEXT: mov x0, x19
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; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload
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; CHECK-NEXT: b callNonVoid
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; CHECK-NEXT: .LBB1_3: // %return
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; CHECK-NEXT: mov w0, wzr
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; CHECK-NEXT: ldp x30, x19, [sp], #16 // 16-byte Folded Reload
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; CHECK-NEXT: ret
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;
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; CHECK-APPLE-LABEL: test2:
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; CHECK-APPLE: ; %bb.0: ; %entry
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; CHECK-APPLE-NEXT: stp x20, x19, [sp, #-32]! ; 16-byte Folded Spill
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; CHECK-APPLE-NEXT: stp x29, x30, [sp, #16] ; 16-byte Folded Spill
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; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 32
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; CHECK-APPLE-NEXT: .cfi_offset w30, -8
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; CHECK-APPLE-NEXT: .cfi_offset w29, -16
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; CHECK-APPLE-NEXT: .cfi_offset w19, -24
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; CHECK-APPLE-NEXT: .cfi_offset w20, -32
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; CHECK-APPLE-NEXT: cbz x0, LBB1_3
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; CHECK-APPLE-NEXT: ; %bb.1: ; %entry
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; CHECK-APPLE-NEXT: Lloh2:
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; CHECK-APPLE-NEXT: adrp x8, _a@PAGE
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; CHECK-APPLE-NEXT: Lloh3:
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; CHECK-APPLE-NEXT: ldrsw x8, [x8, _a@PAGEOFF]
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; CHECK-APPLE-NEXT: mov x19, x0
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; CHECK-APPLE-NEXT: cmp x8, x0
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; CHECK-APPLE-NEXT: b.ne LBB1_3
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; CHECK-APPLE-NEXT: ; %bb.2: ; %if.then2
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; CHECK-APPLE-NEXT: bl _callVoid
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; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: mov x0, x19
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; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: b _callNonVoid
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; CHECK-APPLE-NEXT: LBB1_3: ; %return
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; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: mov w0, wzr
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; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: ret
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; CHECK-APPLE-NEXT: .loh AdrpLdr Lloh2, Lloh3
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entry:
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%tobool = icmp eq i32* %p1, null
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br i1 %tobool, label %return, label %if.end
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if.end: ; preds = %entry
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%0 = load i32, i32* @a, align 4, !tbaa !2
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%conv = sext i32 %0 to i64
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%1 = inttoptr i64 %conv to i32*
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%cmp = icmp eq i32* %1, %p1
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br i1 %cmp, label %if.then2, label %return
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if.then2: ; preds = %if.end
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%call = tail call signext i32 bitcast (i32 (...)* @callVoid to i32 ()*)()
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%call3 = tail call signext i32 @callNonVoid(i32* nonnull %p1)
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br label %return
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return: ; preds = %if.end, %entry, %if.then2
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%retval.0 = phi i32 [ %call3, %if.then2 ], [ 0, %entry ], [ 0, %if.end ]
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ret i32 %retval.0
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}
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define dso_local i8* @test3(i8** nocapture %p1, i8 zeroext %p2) local_unnamed_addr {
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; CHECK-LABEL: test3:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: str x30, [sp, #-32]! // 8-byte Folded Spill
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; CHECK-NEXT: stp x20, x19, [sp, #16] // 16-byte Folded Spill
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; CHECK-NEXT: .cfi_def_cfa_offset 32
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; CHECK-NEXT: .cfi_offset w19, -8
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; CHECK-NEXT: .cfi_offset w20, -16
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; CHECK-NEXT: .cfi_offset w30, -32
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; CHECK-NEXT: ldr x19, [x0]
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; CHECK-NEXT: cbz x19, .LBB2_2
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; CHECK-NEXT: // %bb.1: // %land.rhs
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; CHECK-NEXT: mov x20, x0
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; CHECK-NEXT: mov x0, x19
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; CHECK-NEXT: bl bar
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; CHECK-NEXT: str x0, [x20]
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; CHECK-NEXT: .LBB2_2: // %land.end
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; CHECK-NEXT: mov x0, x19
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; CHECK-NEXT: ldp x20, x19, [sp, #16] // 16-byte Folded Reload
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; CHECK-NEXT: ldr x30, [sp], #32 // 8-byte Folded Reload
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; CHECK-NEXT: ret
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;
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; CHECK-APPLE-LABEL: test3:
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; CHECK-APPLE: ; %bb.0: ; %entry
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; CHECK-APPLE-NEXT: stp x20, x19, [sp, #-32]! ; 16-byte Folded Spill
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; CHECK-APPLE-NEXT: stp x29, x30, [sp, #16] ; 16-byte Folded Spill
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; CHECK-APPLE-NEXT: .cfi_def_cfa_offset 32
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; CHECK-APPLE-NEXT: .cfi_offset w30, -8
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; CHECK-APPLE-NEXT: .cfi_offset w29, -16
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; CHECK-APPLE-NEXT: .cfi_offset w19, -24
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; CHECK-APPLE-NEXT: .cfi_offset w20, -32
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; CHECK-APPLE-NEXT: ldr x19, [x0]
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; CHECK-APPLE-NEXT: cbz x19, LBB2_2
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; CHECK-APPLE-NEXT: ; %bb.1: ; %land.rhs
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; CHECK-APPLE-NEXT: mov x20, x0
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; CHECK-APPLE-NEXT: mov x0, x19
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; CHECK-APPLE-NEXT: bl _bar
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; CHECK-APPLE-NEXT: str x0, [x20]
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; CHECK-APPLE-NEXT: LBB2_2: ; %land.end
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; CHECK-APPLE-NEXT: ldp x29, x30, [sp, #16] ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: mov x0, x19
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; CHECK-APPLE-NEXT: ldp x20, x19, [sp], #32 ; 16-byte Folded Reload
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; CHECK-APPLE-NEXT: ret
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entry:
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%0 = load i8*, i8** %p1, align 8, !tbaa !6
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%tobool = icmp eq i8* %0, null
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br i1 %tobool, label %land.end, label %land.rhs
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land.rhs: ; preds = %entry
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%call = tail call i8* @bar(i8* nonnull %0, i8 zeroext %p2)
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store i8* %call, i8** %p1, align 8, !tbaa !6
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br label %land.end
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land.end: ; preds = %entry, %land.rhs
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ret i8* %0
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}
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declare i8* @bar(i8*, i8 zeroext) local_unnamed_addr
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang version 10.0.0 (trunk 367381) (llvm/trunk 367388)"}
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!2 = !{!3, !3, i64 0}
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!3 = !{!"int", !4, i64 0}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C/C++ TBAA"}
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!6 = !{!7, !7, i64 0}
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!7 = !{!"any pointer", !4, i64 0}
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