[FastISel] fix a fallback diagnostic.

Summary: FastISel was marked as failed in case instruction selection succeeded.

Reviewers: qcolombet, zvi, rovka, ab

Reviewed By: zvi

Subscribers: javed.absar, ab, qcolombet, bogner, llvm-commits

Differential Revision: https://reviews.llvm.org/D34438

llvm-svn: 307489

2 files changed, 20 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 72b1b39a524..bdf57e80584 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -1483,7 +1483,6 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
 
         // Try to select the instruction with FastISel.
         if (FastIS->selectInstruction(Inst)) {
-          FastISelFailed = true;
           --NumFastIselRemaining;
           ++NumFastIselSuccess;
           // If fast isel succeeded, skip over all the folded instructions, and
@@ -1506,6 +1505,8 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
           continue;
         }
 
+        FastISelFailed = true;
+
         // Then handle certain instructions as single-LLVM-Instruction blocks.
         // We cannot separate out GCrelocates to their own blocks since we need
         // to keep track of gc-relocates for a particular gc-statepoint. This is
diff --git a/llvm/test/CodeGen/X86/fast-isel-abort-warm.ll b/llvm/test/CodeGen/X86/fast-isel-abort-warm.ll
index 3caa91b11ec..e87d14bb28a 100644
--- a/llvm/test/CodeGen/X86/fast-isel-abort-warm.ll
+++ b/llvm/test/CodeGen/X86/fast-isel-abort-warm.ll
@@ -1,4 +1,4 @@
-; RUN: llc -fast-isel -o - %s -fast-isel-report-on-fallback 2>&1 | FileCheck %s
+; RUN: llc -fast-isel -o - %s -fast-isel-report-on-fallback -pass-remarks-missed=isel 2>&1 | FileCheck %s
 ; Make sure FastISel report a warming when we asked it to do so.
 ; Note: This test needs to use whatever is not supported by FastISel.
 ;       Thus, this test may fail because inline asm gets supported in FastISel.
@@ -6,9 +6,26 @@
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx"
 
+; CHECK: remark: <unknown>:0:0: FastISel missed call:   call void asm sideeffect
 ; CHECK: warning: Instruction selection used fallback path for foo
 define void @foo(){
 entry:
   call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"()
   ret void
 }
+
+; CHECK: remark: <unknown>:0:0: FastISel missed:   store i128
+; CHECK: warning: Instruction selection used fallback path for test_instruction_fallback
+define void @test_instruction_fallback(i128* %ptr){
+  %v1 = load i128, i128* %ptr
+  %result = add i128 %v1, %v1
+  store i128 %result, i128 * %ptr
+  ret void
+}
+
+; CHECK-NOT: remark: <unknown>:0:0: FastISel missed
+; CHECK-NOT: warning: Instruction selection used fallback path for test_instruction_not_fallback
+define i32 @test_instruction_not_fallback(i32 %a){
+  %result = add i32 %a, %a
+  ret i32 %result
+}