Add missing load/store flags to thumb2 instructions.

These were the cause of a verifier error when building 7zip with
-verify-machineinstrs.  Running 'make check' with the verifier
triggered the same error on the test here so i've updated the test
to run the verifier on one of its runs instead of adding a new one.

While looking at this code, there was a stale comment that these
instructions were only used for disassembly.  This probably used to
be the case, but they are now used in the 'ARM load / store optimization pass' too.

This reapplies r242300 which was reverted in r242428 due to bot failures.

Ultimately those failures were spurious and completely unrelated to this commit.  I reverted this
at the time because it was thought to be at fault.

llvm-svn: 250969

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARMInstrThumb2.td b/llvm/lib/Target/ARM/ARMInstrThumb2.td
index 8ba12ad89ad..a2c7b9942c2 100644
--- a/llvm/lib/Target/ARM/ARMInstrThumb2.td
+++ b/llvm/lib/Target/ARM/ARMInstrThumb2.td
@@ -1554,19 +1554,21 @@ def t2STRBT  : T2IstT<0b00, "strbt", IIC_iStore_bh_i>;
 def t2STRHT  : T2IstT<0b01, "strht", IIC_iStore_bh_i>;
 
 // ldrd / strd pre / post variants
-// For disassembly only.
 
+let mayLoad = 1 in
 def t2LDRD_PRE  : T2Ii8s4<1, 1, 1, (outs rGPR:$Rt, rGPR:$Rt2, GPR:$wb),
                  (ins t2addrmode_imm8s4_pre:$addr), IIC_iLoad_d_ru,
                  "ldrd", "\t$Rt, $Rt2, $addr!", "$addr.base = $wb", []> {
   let DecoderMethod = "DecodeT2LDRDPreInstruction";
 }
 
+let mayLoad = 1 in
 def t2LDRD_POST : T2Ii8s4post<0, 1, 1, (outs rGPR:$Rt, rGPR:$Rt2, GPR:$wb),
                  (ins addr_offset_none:$addr, t2am_imm8s4_offset:$imm),
                  IIC_iLoad_d_ru, "ldrd", "\t$Rt, $Rt2, $addr$imm",
                  "$addr.base = $wb", []>;
 
+let mayStore = 1 in
 def t2STRD_PRE  : T2Ii8s4<1, 1, 0, (outs GPR:$wb),
                  (ins rGPR:$Rt, rGPR:$Rt2, t2addrmode_imm8s4_pre:$addr),
                  IIC_iStore_d_ru, "strd", "\t$Rt, $Rt2, $addr!",
@@ -1574,6 +1576,7 @@ def t2STRD_PRE  : T2Ii8s4<1, 1, 0, (outs GPR:$wb),
   let DecoderMethod = "DecodeT2STRDPreInstruction";
 }
 
+let mayStore = 1 in
 def t2STRD_POST : T2Ii8s4post<0, 1, 0, (outs GPR:$wb),
                  (ins rGPR:$Rt, rGPR:$Rt2, addr_offset_none:$addr,
                       t2am_imm8s4_offset:$imm),