[GlobalISel] Disable GISel for big endian.

This is due to PR26161 needing to be resolved before we can fix
big endian bugs like PR35359. The work to split aggregates into smaller LLTs
instead of using one large scalar will take some time, so in the mean time
we'll fall back to SDAG.

Some ARM BE tests xfailed for now as a result.

Differential Revision: https://reviews.llvm.org/D40789

llvm-svn: 320388

4 files changed, 16 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index e911085d0ad..8ecfd1e9efd 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1253,6 +1253,15 @@ bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {
 
   assert(PendingPHIs.empty() && "stale PHIs");
 
+  if (!DL->isLittleEndian()) {
+    // Currently we don't properly handle big endian code.
+    OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
+                               MF->getFunction()->getSubprogram(),
+                               &MF->getFunction()->getEntryBlock());
+    R << "unable to translate in big endian mode";
+    reportTranslationError(*MF, *TPC, *ORE, R);
+  }
+
   // Release the per-function state when we return, whether we succeeded or not.
   auto FinalizeOnReturn = make_scope_exit([this]() { finalizeFunction(); });
 
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll b/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
index 72069f0e62e..86ac5507a40 100644
--- a/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/arm64-fallback.ll
@@ -3,6 +3,7 @@
 ; RUN: llc -O0 -global-isel -global-isel-abort=2 -pass-remarks-missed='gisel*' -verify-machineinstrs %s -o %t.out 2> %t.err
 ; RUN: FileCheck %s --check-prefix=FALLBACK-WITH-REPORT-OUT < %t.out
 ; RUN: FileCheck %s --check-prefix=FALLBACK-WITH-REPORT-ERR < %t.err
+; RUN: not llc -global-isel -mtriple aarch64_be %s -o - 2>&1 | FileCheck %s --check-prefix=BIG-ENDIAN
 ; This file checks that the fallback path to selection dag works.
 ; The test is fragile in the sense that it must be updated to expose
 ; something that fails with global-isel.
@@ -12,6 +13,8 @@
 target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
 target triple = "aarch64--"
 
+; BIG-ENDIAN: unable to translate in big endian mode
+
 ; We use __fixunstfti as the common denominator for __fixunstfti on Linux and
 ; ___fixunstfti on iOS
 ; ERROR: unable to lower arguments: i128 (i128)* (in function: ABIi128)
diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll b/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
index 194c6270437..9c070e858b9 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
@@ -1,5 +1,6 @@
 ; RUN: llc -mtriple arm-unknown -mattr=+vfp2,+v4t -global-isel -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=CHECK -check-prefix=LITTLE
-; RUN: llc -mtriple armeb-unknown -mattr=+vfp2,+v4t -global-isel -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=CHECK -check-prefix=BIG
+; RUN: llc -mtriple armeb-unknown -mattr=+vfp2,+v4t -global-isel -global-isel-abort=0 -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=CHECK -check-prefix=BIG
+; XFAIL: armeb
 
 define void @test_void_return() {
 ; CHECK-LABEL: name: test_void_return
diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-param-lowering.ll b/llvm/test/CodeGen/ARM/GlobalISel/arm-param-lowering.ll
index fd484287398..e7aaa74fb98 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-param-lowering.ll
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-param-lowering.ll
@@ -1,5 +1,6 @@
 ; RUN: llc -mtriple arm-unknown -mattr=+vfp2,+v4t -global-isel -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=CHECK -check-prefix=LITTLE
-; RUN: llc -mtriple armeb-unknown -mattr=+vfp2,+v4t -global-isel -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=CHECK -check-prefix=BIG
+; RUN: llc -mtriple armeb-unknown -mattr=+vfp2,+v4t -global-isel -global-isel-abort=0 -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=CHECK -check-prefix=BIG
+; XFAIL: armeb
 
 declare arm_aapcscc i32* @simple_reg_params_target(i32, i32*)