[ARM] GlobalISel: Mark shifts as legal for s32

The new legalize combiner introduces shifts all over the place, so we
should support them sooner rather than later.

llvm-svn: 315064

2 files changed, 82 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
index 8185f8acc92..695e0f6326d 100644
--- a/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMLegalizerInfo.cpp
@@ -80,6 +80,9 @@ ARMLegalizerInfo::ARMLegalizerInfo(const ARMSubtarget &ST) {
       setAction({Op, 1, Ty}, Legal);
   }
 
+  for (unsigned Op : {G_ASHR, G_LSHR, G_SHL})
+    setAction({Op, s32}, Legal);
+
   setAction({G_GEP, p0}, Legal);
   setAction({G_GEP, 1, s32}, Legal);
 
diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir b/llvm/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir
index 1fb7c79cd24..9e7fcc0439a 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir
@@ -27,6 +27,10 @@
   define void @test_xor_s16() { ret void }
   define void @test_xor_s32() { ret void }
 
+  define void @test_lshr_s32() { ret void }
+  define void @test_ashr_s32() { ret void }
+  define void @test_shl_s32() { ret void }
+
   define void @test_load_from_stack() { ret void }
   define void @test_legal_loads() #0 { ret void }
   define void @test_legal_stores() #0 { ret void }
@@ -565,6 +569,81 @@ body:             |
 
 ...
 ---
+name:            test_lshr_s32
+# CHECK-LABEL: name: test_lshr_s32
+legalized:       false
+# CHECK: legalized: true
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.0:
+    liveins: %r0, %r1
+
+    %0(s32) = COPY %r0
+    %1(s32) = COPY %r1
+    %2(s32) = G_LSHR %0, %1
+    ; G_LSHR with s32 is legal, so we should find it unchanged in the output
+    ; CHECK: {{%[0-9]+}}(s32) = G_LSHR {{%[0-9]+, %[0-9]+}}
+    %r0 = COPY %2(s32)
+    BX_RET 14, _, implicit %r0
+
+...
+---
+name:            test_ashr_s32
+# CHECK-LABEL: name: test_ashr_s32
+legalized:       false
+# CHECK: legalized: true
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.0:
+    liveins: %r0, %r1
+
+    %0(s32) = COPY %r0
+    %1(s32) = COPY %r1
+    %2(s32) = G_ASHR %0, %1
+    ; G_ASHR with s32 is legal, so we should find it unchanged in the output
+    ; CHECK: {{%[0-9]+}}(s32) = G_ASHR {{%[0-9]+, %[0-9]+}}
+    %r0 = COPY %2(s32)
+    BX_RET 14, _, implicit %r0
+
+...
+---
+name:            test_shl_s32
+# CHECK-LABEL: name: test_shl_s32
+legalized:       false
+# CHECK: legalized: true
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.0:
+    liveins: %r0, %r1
+
+    %0(s32) = COPY %r0
+    %1(s32) = COPY %r1
+    %2(s32) = G_SHL %0, %1
+    ; G_SHL with s32 is legal, so we should find it unchanged in the output
+    ; CHECK: {{%[0-9]+}}(s32) = G_SHL {{%[0-9]+, %[0-9]+}}
+    %r0 = COPY %2(s32)
+    BX_RET 14, _, implicit %r0
+
+...
+---
 name:            test_load_from_stack
 # CHECK-LABEL: name: test_load_from_stack
 legalized:       false