GlobalISel: mark G_BRCOND on s1 as legal.

It's going to be a TBNZ (at -O0) anyway, so the high bits don't matter.

llvm-svn: 284070

llvm/lib/Target/AArch64/AArch64MachineLegalizer.cpp

@@ -156,9 +156,8 @@ AArch64MachineLegalizer::AArch64MachineLegalizer() {
   }
 
   // Control-flow
-  setAction({G_BRCOND, s32}, Legal);
-  for (auto Ty : {s1, s8, s16})
-    setAction({G_BRCOND, Ty}, WidenScalar);
+  for (auto Ty : {s1, s8, s16, s32})
+    setAction({G_BRCOND, Ty}, Legal);
 
   // Select
   for (auto Ty : {s1, s8, s16, s32, s64})

llvm/test/CodeGen/AArch64/GlobalISel/legalize-simple.mir

@@ -47,6 +47,7 @@ registers:
   - { id: 30, class: _ }
   - { id: 31, class: _ }
   - { id: 32, class: _ }
+  - { id: 33, class: _ }
 body: |
   bb.0.entry:
     liveins: %x0, %x1, %x2, %x3
@@ -58,8 +59,7 @@ body: |
     %1(p0) = G_INTTOPTR %0
     %2(s64) = G_PTRTOINT %1
 
-    ; CHECK: [[TST32:%[0-9]+]](s32) = G_ANYEXT %3
-    ; CHECK: G_BRCOND [[TST32]](s32), %bb.1.next
+    ; CHECK: G_BRCOND %3(s1), %bb.1.next
     %3(s1) = G_TRUNC %0
     G_BRCOND %3, %bb.1.next