23d45e55ed
Previously we wouldn't remove dead copies from basic blocks with successors. The comment said we didn't want to trust the live-in lists. The comment is very old so I'm not sure if that's still a concern today. This patch checks the live-in lists and removes copies from MaybeDeadCopies if they are referenced by any live-ins in any successors. We only do this if the tracksLiveness property is set. If that property is not set, we retain the old behavior.
88 lines
3.0 KiB
LLVM
88 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=thumbv8.1-m.main-none-eabi -mcpu=cortex-m55 -O3 < %s | FileCheck %s
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define i32 @loop(ptr nocapture readonly %x) {
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; CHECK-LABEL: loop:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: mov.w lr, #500
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; CHECK-NEXT: mov r1, r0
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: .p2align 2
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; CHECK-NEXT: .LBB0_1: @ %for.body
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: ldr r2, [r1], #4
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; CHECK-NEXT: add r0, r2
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; CHECK-NEXT: le lr, .LBB0_1
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; CHECK-NEXT: @ %bb.2: @ %for.cond.cleanup
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; CHECK-NEXT: pop {r7, pc}
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret i32 %add
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for.body: ; preds = %entry, %for.body
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%i.07 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%s.06 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, ptr %x, i32 %i.07
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%0 = load i32, ptr %arrayidx, align 4
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%add = add nsw i32 %0, %s.06
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%inc = add nuw nsw i32 %i.07, 1
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%exitcond.not = icmp eq i32 %inc, 500
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
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}
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define i64 @loopif(ptr nocapture readonly %x, i32 %y, i32 %n) {
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; CHECK-LABEL: loopif:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: cmp r2, #1
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; CHECK-NEXT: blt .LBB1_4
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; CHECK-NEXT: @ %bb.1: @ %for.body.lr.ph
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; CHECK-NEXT: dls lr, r2
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; CHECK-NEXT: mov r12, r0
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: movs r3, #0
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; CHECK-NEXT: .p2align 2
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; CHECK-NEXT: .LBB1_2: @ %for.body
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: ldr r2, [r12], #4
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; CHECK-NEXT: smlal r0, r3, r2, r1
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; CHECK-NEXT: le lr, .LBB1_2
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; CHECK-NEXT: @ %bb.3: @ %for.cond.cleanup
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; CHECK-NEXT: mov r1, r3
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; CHECK-NEXT: pop {r7, pc}
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; CHECK-NEXT: .p2align 2
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; CHECK-NEXT: .LBB1_4:
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: movs r3, #0
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; CHECK-NEXT: mov r1, r3
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; CHECK-NEXT: pop {r7, pc}
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entry:
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%cmp7 = icmp sgt i32 %n, 0
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br i1 %cmp7, label %for.body.lr.ph, label %for.cond.cleanup
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for.body.lr.ph: ; preds = %entry
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%conv1 = sext i32 %y to i64
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br label %for.body
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for.cond.cleanup: ; preds = %for.body, %entry
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%s.0.lcssa = phi i64 [ 0, %entry ], [ %add, %for.body ]
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ret i64 %s.0.lcssa
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for.body: ; preds = %for.body.lr.ph, %for.body
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%i.09 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%s.08 = phi i64 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, ptr %x, i32 %i.09
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%0 = load i32, ptr %arrayidx, align 4
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%conv = sext i32 %0 to i64
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%mul = mul nsw i64 %conv, %conv1
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%add = add nsw i64 %mul, %s.08
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%inc = add nuw nsw i32 %i.09, 1
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%exitcond.not = icmp eq i32 %inc, %n
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
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}
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