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[Hexagon] Late predicate producers cannot be used as dot-new sources 

llvm-svn: 334426
This commit is contained in:
Krzysztof Parzyszek 2018-06-11 18:45:52 +00:00
parent cc63761720
commit dd9415d550
2 changed files with 49 additions and 4 deletions
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27
llvm/lib/Target/Hexagon/HexagonInstrInfo.cpp
View File

@ -3048,10 +3048,29 @@ bool HexagonInstrInfo::predCanBeUsedAsDotNew(const MachineInstr &MI,
return false;
}
// Hexagon Programmer's Reference says that decbin, memw_locked, and
// memd_locked cannot be used as .new as well,
// but we don't seem to have these instructions defined.
return MI.getOpcode() != Hexagon::A4_tlbmatch;
// Instruction that produce late predicate cannot be used as sources of
// dot-new.
switch (MI.getOpcode()) {
case Hexagon::A4_addp_c:
case Hexagon::A4_subp_c:
case Hexagon::A4_tlbmatch:
case Hexagon::A5_ACS:
case Hexagon::F2_sfinvsqrta:
case Hexagon::F2_sfrecipa:
case Hexagon::J2_endloop0:
case Hexagon::J2_endloop01:
case Hexagon::J2_ploop1si:
case Hexagon::J2_ploop1sr:
case Hexagon::J2_ploop2si:
case Hexagon::J2_ploop2sr:
case Hexagon::J2_ploop3si:
case Hexagon::J2_ploop3sr:
case Hexagon::S2_cabacdecbin:
case Hexagon::S2_storew_locked:
case Hexagon::S4_stored_locked:
return false;
}
return true;
}
bool HexagonInstrInfo::PredOpcodeHasJMP_c(unsigned Opcode) const {

26
llvm/test/CodeGen/Hexagon/late-pred.ll Normal file
View File

@ -0,0 +1,26 @@
; RUN: llc -march=hexagon < %s | FileCheck %s
; This generates A4_addp_c, which cannot be used as a dot-new predicate
; producer (resulting in a crash).
; CHECK-NOT: p{{[0-3]+}}.new
target triple = "hexagon"
define void @ext4_group_extend() #0 {
entry:
%es.idx.val = load i32, i32* undef, align 4
%conv1.i = zext i32 %es.idx.val to i64
%or.i = or i64 undef, %conv1.i
%add20 = add i64 %or.i, undef
%cmp21 = icmp ult i64 %add20, %or.i
br i1 %cmp21, label %if.then23, label %if.end24
if.then23: ; preds = %entry
unreachable
if.end24: ; preds = %entry
unreachable
}
attributes #0 = { nounwind "target-cpu"="hexagonv65" }