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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
114 lines
3.5 KiB
LLVM
114 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=powerpc64le-unknown-linux-gnu -verify-machineinstrs\
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; RUN: -mcpu=pwr9 --ppc-enable-pipeliner 2>&1 | FileCheck %s
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@.str.28 = external unnamed_addr constant [69 x i8], align 1
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define void @print_res() nounwind {
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; CHECK-LABEL: print_res:
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; CHECK: # %bb.0:
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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, -128(1)
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; CHECK-NEXT: lwz 3, 0(3)
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; CHECK-NEXT: addi 3, 3, -1
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; CHECK-NEXT: clrldi 4, 3, 32
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; CHECK-NEXT: cmplwi 3, 1
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; CHECK-NEXT: li 3, 1
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; CHECK-NEXT: iselgt 3, 4, 3
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; CHECK-NEXT: li 4, 2
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; CHECK-NEXT: addi 3, 3, -1
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; CHECK-NEXT: cmpldi 3, 2
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; CHECK-NEXT: isellt 3, 3, 4
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; CHECK-NEXT: li 4, 0
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; CHECK-NEXT: addi 3, 3, 1
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; CHECK-NEXT: li 7, -1
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; CHECK-NEXT: li 5, 0
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; CHECK-NEXT: mtctr 3
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; CHECK-NEXT: li 3, 1
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; CHECK-NEXT: lbz 5, 0(5)
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; CHECK-NEXT: bdz .LBB0_6
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; CHECK-NEXT: # %bb.1:
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; CHECK-NEXT: addi 3, 3, 1
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; CHECK-NEXT: addi 8, 7, -1
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; CHECK-NEXT: xori 6, 5, 84
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; CHECK-NEXT: clrldi 5, 7, 32
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; CHECK-NEXT: lbz 5, 0(5)
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; CHECK-NEXT: bdz .LBB0_5
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; CHECK-NEXT: # %bb.2:
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; CHECK-NEXT: addi 3, 3, 1
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; CHECK-NEXT: cntlzw 6, 6
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; CHECK-NEXT: srwi 7, 6, 5
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; CHECK-NEXT: xori 6, 5, 84
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; CHECK-NEXT: clrldi 5, 8, 32
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; CHECK-NEXT: addi 8, 8, -1
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; CHECK-NEXT: lbz 5, 0(5)
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; CHECK-NEXT: bdz .LBB0_4
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; CHECK-NEXT: .LBB0_3:
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; CHECK-NEXT: addi 3, 3, 1
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; CHECK-NEXT: clrldi 10, 8, 32
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; CHECK-NEXT: addi 8, 8, -1
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; CHECK-NEXT: cntlzw 9, 6
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; CHECK-NEXT: xori 6, 5, 84
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; CHECK-NEXT: lbz 5, 0(10)
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; CHECK-NEXT: add 4, 4, 7
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; CHECK-NEXT: srwi 7, 9, 5
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; CHECK-NEXT: bdnz .LBB0_3
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; CHECK-NEXT: .LBB0_4:
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; CHECK-NEXT: add 4, 4, 7
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; CHECK-NEXT: .LBB0_5:
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; CHECK-NEXT: cntlzw 6, 6
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; CHECK-NEXT: srwi 6, 6, 5
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; CHECK-NEXT: add 4, 4, 6
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; CHECK-NEXT: .LBB0_6:
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; CHECK-NEXT: xori 5, 5, 84
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; CHECK-NEXT: clrldi 3, 3, 32
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; CHECK-NEXT: li 7, 0
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; CHECK-NEXT: li 8, 3
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; CHECK-NEXT: std 3, 104(1)
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; CHECK-NEXT: cntlzw 5, 5
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; CHECK-NEXT: addis 3, 2, .LC0@toc@ha
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; CHECK-NEXT: li 10, 0
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; CHECK-NEXT: ld 3, .LC0@toc@l(3)
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; CHECK-NEXT: srwi 5, 5, 5
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; CHECK-NEXT: add 4, 4, 5
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; CHECK-NEXT: li 5, 0
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; CHECK-NEXT: std 5, 120(1)
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; CHECK-NEXT: li 5, 3
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; CHECK-NEXT: clrldi 6, 4, 32
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; CHECK-NEXT: li 4, 3
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; CHECK-NEXT: std 5, 96(1)
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; CHECK-NEXT: li 5, 0
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; CHECK-NEXT: bl printf
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; CHECK-NEXT: nop
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%1 = load i32, i32* undef, align 4
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%2 = add i32 %1, -1
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%3 = zext i32 %2 to i64
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%4 = zext i32 3 to i64
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br label %5
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5: ; preds = %5, %0
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%6 = phi i64 [ %16, %5 ], [ 0, %0 ]
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%7 = phi i32 [ %15, %5 ], [ 0, %0 ]
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%8 = trunc i64 %6 to i32
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%9 = sub i32 0, %8
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%10 = zext i32 %9 to i64
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%11 = getelementptr inbounds i8, i8* null, i64 %10
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%12 = load i8, i8* %11, align 1
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%13 = icmp eq i8 %12, 84
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%14 = zext i1 %13 to i32
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%15 = add i32 %7, %14
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%16 = add nuw nsw i64 %6, 1
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%17 = icmp ult i64 %16, %3
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%18 = icmp ult i64 %16, %4
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%19 = and i1 %18, %17
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br i1 %19, label %5, label %20
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20: ; preds = %5
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%21 = trunc i64 %16 to i32
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call void (i8*, ...) @printf(i8* getelementptr inbounds ([69 x i8], [69 x i8]* @.str.28, i64 0, i64 0), i32 zeroext 3, i32 zeroext undef, i32 zeroext %15, i32 zeroext undef, i32 zeroext 3, i8* undef, i32 zeroext undef, i32 zeroext 3, i32 zeroext %21, i8* undef, i32 zeroext undef) #1
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unreachable
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}
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declare void @printf(i8*, ...) local_unnamed_addr #0
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