[llvm] r307239 - [ARM] GlobalISel: Widen s1, s8, s16 G_CONSTANT

[Diana Picus via llvm-commits]

Author: rovka
Date: Thu Jul  6 01:04:16 2017
New Revision: 307239

URL: http://llvm.org/viewvc/llvm-project?rev=307239&view=rev
Log:
[ARM] GlobalISel: Widen s1, s8, s16 G_CONSTANT

Get the legalizer to widen small constants.

Modified:
    llvm/trunk/lib/Target/ARM/ARMLegalizerInfo.cpp
    llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir

Modified: llvm/trunk/lib/Target/ARM/ARMLegalizerInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMLegalizerInfo.cpp?rev=307239&r1=307238&r2=307239&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMLegalizerInfo.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMLegalizerInfo.cpp Thu Jul  6 01:04:16 2017
@@ -89,6 +89,8 @@ ARMLegalizerInfo::ARMLegalizerInfo(const
   setAction({G_SELECT, 1, s1}, Legal);
 
   setAction({G_CONSTANT, s32}, Legal);
+  for (auto Ty : {s1, s8, s16})
+    setAction({G_CONSTANT, Ty}, WidenScalar);
 
   setAction({G_ICMP, s1}, Legal);
   for (auto Ty : {s8, s16})

Modified: llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir?rev=307239&r1=307238&r2=307239&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir (original)
+++ llvm/trunk/test/CodeGen/ARM/GlobalISel/arm-legalizer.mir Thu Jul  6 01:04:16 2017
@@ -689,11 +689,26 @@ selected:        false
 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+  - { id: 3, class: _ }
 body:             |
   bb.0:
     %0(s32) = G_CONSTANT 42
     ; CHECK: {{%[0-9]+}}(s32) = G_CONSTANT 42
 
+    %1(s16) = G_CONSTANT i16 21
+    ; CHECK: [[EXT:%[0-9]+]](s32) = G_CONSTANT i32 21
+    ; CHECK: {{%[0-9]+}}(s16) = G_TRUNC [[EXT]](s32)
+
+    %2(s8) = G_CONSTANT i8 10
+    ; CHECK: [[EXT:%[0-9]+]](s32) = G_CONSTANT i32 10
+    ; CHECK: {{%[0-9]+}}(s8) = G_TRUNC [[EXT]](s32)
+
+    %3(s1) = G_CONSTANT i1 1
+    ; CHECK: [[EXT:%[0-9]+]](s32) = G_CONSTANT i32 -1
+    ; CHECK: {{%[0-9]+}}(s1) = G_TRUNC [[EXT]](s32)
+
     %r0 = COPY %0(s32)
     BX_RET 14, _, implicit %r0
 ...