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3f23d4b8c3
tryLatency compares two sched candidates. For the top zone it prefers the one with lesser depth, but only if that depth is greater than the total latency of the instructions we've already scheduled -- otherwise its latency would be hidden and there would be no stall. Unfortunately it only tests the depth of one of the candidates. This can lead to situations where the TopDepthReduce heuristic does not kick in, but a lower priority heuristic chooses the other candidate, whose depth *is* greater than the already scheduled latency, which causes a stall. The fix is to apply the heuristic if the depth of *either* candidate is greater than the already scheduled latency. All this also applies to the BotHeightReduce heuristic in the bottom zone. Differential Revision: https://reviews.llvm.org/D72392
53 lines
1.8 KiB
LLVM
53 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr9 < %s | FileCheck %s
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%0 = type { double, [0 x %1] }
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%1 = type { i32 }
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@f = external dso_local thread_local local_unnamed_addr global %0, align 8
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@g = external dso_local local_unnamed_addr global i32, align 4
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; Function Attrs: nounwind
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define dso_local void @h() local_unnamed_addr #0 {
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; CHECK-LABEL: h:
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; CHECK: # %bb.0: # %bb
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; CHECK-NEXT: mflr 0
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; CHECK-NEXT: std 0, 16(1)
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; CHECK-NEXT: stdu 1, -64(1)
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; CHECK-NEXT: addis 3, 2, g@toc@ha
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; CHECK-NEXT: std 30, 48(1) # 8-byte Folded Spill
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; CHECK-NEXT: lwz 3, g@toc@l(3)
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; CHECK-NEXT: extswsli 30, 3, 2
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; CHECK-NEXT: addis 3, 2, f@got@tlsld@ha
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; CHECK-NEXT: addi 3, 3, f@got@tlsld@l
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; CHECK-NEXT: bl __tls_get_addr(f@tlsld)
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; CHECK-NEXT: nop
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; CHECK-NEXT: addis 3, 3, f@dtprel@ha
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; CHECK-NEXT: addi 3, 3, f@dtprel@l
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; CHECK-NEXT: add 3, 3, 30
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; CHECK-NEXT: lwz 3, 8(3)
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; CHECK-NEXT: cmplwi 3, 0
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; CHECK-NEXT: bne- 0, .LBB0_2
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; CHECK-NEXT: # %bb.1: # %bb6
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; CHECK-NEXT: ld 30, 48(1) # 8-byte Folded Reload
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; CHECK-NEXT: addi 1, 1, 64
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; CHECK-NEXT: ld 0, 16(1)
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; CHECK-NEXT: mtlr 0
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; CHECK-NEXT: blr
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; CHECK-NEXT: .LBB0_2: # %bb5
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bb:
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%i = load i32, i32* @g, align 4
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%i1 = sext i32 %i to i64
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%i2 = getelementptr inbounds [0 x %1], [0 x %1]* bitcast (double* getelementptr inbounds (%0, %0* @f, i64 1, i32 0) to [0 x %1]*), i64 0, i64 %i1, i32 0
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%i3 = load i32, i32* %i2, align 4
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%i4 = icmp eq i32 %i3, 0
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br i1 %i4, label %bb6, label %bb5
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bb5: ; preds = %bb
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unreachable
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bb6: ; preds = %bb
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ret void
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}
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attributes #0 = { nounwind }
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