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[SystemZ] Clear Available set in SystemZPostRASchedStrategy::initialize().

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This needs to be done in order to not crash with -misched-cutoff.

Fixes https://bugs.llvm.org/show_bug.cgi?id=45928

Review: Ulrich Weigand

Differential Revision: https://reviews.llvm.org/D94383
This commit is contained in:
Jonas Paulsson 2021-01-11 02:59:16 +01:00
parent 31ab135817
commit 903410342b
2 changed files with 50 additions and 0 deletions
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1
lib/Target/SystemZ/SystemZMachineScheduler.cpp
View File

@ -72,6 +72,7 @@ advanceTo(MachineBasicBlock::iterator NextBegin) {
}
void SystemZPostRASchedStrategy::initialize(ScheduleDAGMI *dag) {
Available.clear(); // -misched-cutoff.
LLVM_DEBUG(HazardRec->dumpState(););
}

49
test/CodeGen/SystemZ/misched-cutoff.ll Normal file
View File

@ -0,0 +1,49 @@
; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -misched-cutoff=1 -o /dev/null < %s
;
; Test that the post-ra scheduler does not crash with -misched-cutoff.
@g_184 = external dso_local global i16, align 2
@g_294 = external dso_local global [1 x [9 x i32*]], align 8
define void @fun() {
bb:
br label %bb1
bb1: ; preds = %bb1, %bb
%i = phi i64 [ 0, %bb ], [ %i22, %bb1 ]
%i2 = trunc i64 %i to i32
%i3 = lshr i32 %i2, 1
%i4 = select i1 false, i32 %i3, i32 undef
%i5 = lshr i32 %i4, 1
%i6 = xor i32 %i5, -306674912
%i7 = select i1 undef, i32 %i5, i32 %i6
%i8 = lshr i32 %i7, 1
%i9 = xor i32 %i8, -306674912
%i10 = select i1 undef, i32 %i8, i32 %i9
%i11 = lshr i32 %i10, 1
%i12 = xor i32 %i11, -306674912
%i13 = select i1 undef, i32 %i11, i32 %i12
%i14 = lshr i32 %i13, 1
%i15 = select i1 false, i32 %i14, i32 undef
%i16 = lshr i32 %i15, 1
%i17 = select i1 false, i32 %i16, i32 undef
%i18 = lshr i32 %i17, 1
%i19 = select i1 false, i32 %i18, i32 undef
%i20 = lshr i32 %i19, 1
%i21 = select i1 false, i32 %i20, i32 undef
store i32 %i21, i32* undef, align 4
%i22 = add nuw nsw i64 %i, 1
%i23 = icmp ult i64 %i, 255
br i1 %i23, label %bb1, label %bb24
bb24: ; preds = %bb1
%i25 = load volatile i16, i16* undef
store i32* null, i32** undef, align 8
store i32 -10, i32* undef, align 4
store i32 -10, i32* null, align 4
store i32 -10, i32* undef, align 4
store i16 0, i16* @g_184, align 2
store i32* null, i32** getelementptr inbounds ([1 x [9 x i32*]], [1 x [9 x i32*]]* @g_294, i64 0, i64 0, i64 2), align 8
store i32* null, i32** getelementptr inbounds ([1 x [9 x i32*]], [1 x [9 x i32*]]* @g_294, i64 0, i64 0, i64 5), align 8
unreachable
}