c4a60c9d34
This is an attempt to reland D42600 and enabling this optimisation by default. This also resolves the issue pointed out in the context of PGO build. Differential Revision: https://reviews.llvm.org/D42600
99 lines
3.2 KiB
LLVM
99 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
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; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7-unknown-linux-gnueabihf"
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%Target = type { ptr, ptr }
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%List = type { i32, ptr }
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; The entry block should be the first block of the function.
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define i1 @foo(ptr %ha, i32 %he) !prof !39 {
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; CHECK-LABEL: foo:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: ldr r2, [r0]
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: itt eq
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; CHECK-NEXT: moveq r0, #0
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; CHECK-NEXT: bxeq lr
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; CHECK-NEXT: .LBB0_1: @ %for.body.preheader
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: b .LBB0_3
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; CHECK-NEXT: .LBB0_2: @ %for.inc
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; CHECK-NEXT: @ in Loop: Header=BB0_3 Depth=1
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; CHECK-NEXT: ldr r2, [r2]
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: it eq
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; CHECK-NEXT: popeq {r7, pc}
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; CHECK-NEXT: .LBB0_3: @ %for.body
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; CHECK-NEXT: @ =>This Loop Header: Depth=1
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; CHECK-NEXT: @ Child Loop BB0_5 Depth 2
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; CHECK-NEXT: ldr r0, [r2, #4]
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; CHECK-NEXT: cmp r0, #0
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; CHECK-NEXT: beq .LBB0_2
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; CHECK-NEXT: @ %bb.4: @ %if.then
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; CHECK-NEXT: @ in Loop: Header=BB0_3 Depth=1
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; CHECK-NEXT: ldrd r3, r0, [r0]
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; CHECK-NEXT: sub.w r12, r0, #4
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; CHECK-NEXT: .LBB0_5: @ %for.cond.i
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; CHECK-NEXT: @ Parent Loop BB0_3 Depth=1
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; CHECK-NEXT: @ => This Inner Loop Header: Depth=2
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; CHECK-NEXT: cmp r3, #1
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; CHECK-NEXT: blt .LBB0_2
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; CHECK-NEXT: @ %bb.6: @ %for.body.i
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; CHECK-NEXT: @ in Loop: Header=BB0_5 Depth=2
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; CHECK-NEXT: ldr.w lr, [r12, r3, lsl #2]
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; CHECK-NEXT: subs r3, #1
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; CHECK-NEXT: movs r0, #1
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; CHECK-NEXT: cmp lr, r1
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; CHECK-NEXT: bne .LBB0_5
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; CHECK-NEXT: @ %bb.7:
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; CHECK-NEXT: pop {r7, pc}
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entry:
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%TargetPtr = load ptr, ptr %ha, align 4
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%cmp1 = icmp eq ptr %TargetPtr, null
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br i1 %cmp1, label %return, label %for.body, !prof !50
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for.body:
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%TargetPhi = phi ptr [ %NextPtr, %for.inc ], [ %TargetPtr, %entry ]
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%ListAddr = getelementptr inbounds %Target, ptr %TargetPhi, i32 0, i32 1
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%ListPtr = load ptr, ptr %ListAddr, align 4
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%cmp2 = icmp eq ptr %ListPtr, null
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br i1 %cmp2, label %for.inc, label %if.then, !prof !59
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if.then:
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%len = load i32, ptr %ListPtr, align 4
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%ptr = getelementptr inbounds %List, ptr %ListPtr, i32 0, i32 1
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%ptr2 = load ptr, ptr %ptr, align 4
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br label %for.cond.i
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for.cond.i:
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%i = phi i32 [ %len, %if.then ], [ %index, %for.body.i ]
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%index = add nsw i32 %i, -1
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%cmp3 = icmp sgt i32 %i, 0
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br i1 %cmp3, label %for.body.i, label %for.inc, !prof !75
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for.body.i:
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%ptr3 = getelementptr inbounds i32, ptr %ptr2, i32 %index
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%data = load i32, ptr %ptr3, align 4
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%cmp4 = icmp eq i32 %data, %he
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br i1 %cmp4, label %return, label %for.cond.i, !prof !79
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for.inc:
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%NextPtr = load ptr, ptr %TargetPhi, align 4
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%cmp5 = icmp eq ptr %NextPtr, null
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br i1 %cmp5, label %return, label %for.body, !prof !50
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return:
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%retval = phi i1 [ false, %entry ], [ true, %for.body.i ], [ false, %for.inc ]
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ret i1 %retval
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}
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!39 = !{!"function_entry_count", i64 226}
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!50 = !{!"branch_weights", i32 451, i32 1}
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!59 = !{!"branch_weights", i32 1502, i32 1}
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!75 = !{!"branch_weights", i32 301, i32 1}
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!79 = !{!"branch_weights", i32 1, i32 301}
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