[AMDGPU][NFC] Cleanly make 32-bit abs legal (#164837)

Cleanly make 32-bit abs legal only in SIISelLowering.cpp

Signed-off-by: John Lu <John.Lu@amd.com>

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
index 8ed4062..1b559a6 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
@@ -514,8 +514,8 @@
       MVT::i64, Custom);
   setOperationAction(ISD::SELECT_CC, MVT::i64, Expand);
 
-  setOperationAction({ISD::ABS, ISD::SMIN, ISD::UMIN, ISD::SMAX, ISD::UMAX},
-                     MVT::i32, Legal);
+  setOperationAction({ISD::SMIN, ISD::UMIN, ISD::SMAX, ISD::UMAX}, MVT::i32,
+                     Legal);
 
   setOperationAction(
       {ISD::CTTZ, ISD::CTTZ_ZERO_UNDEF, ISD::CTLZ, ISD::CTLZ_ZERO_UNDEF},

llvm/lib/Target/AMDGPU/R600ISelLowering.cpp

diff --git a/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp b/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
index 09ef6ac..2aa54c9 100644
--- a/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/R600ISelLowering.cpp
@@ -45,9 +45,6 @@
   // Legalize loads and stores to the private address space.
   setOperationAction(ISD::LOAD, {MVT::i32, MVT::v2i32, MVT::v4i32}, Custom);
 
-  // 32-bit ABS is legal for AMDGPU except for R600
-  setOperationAction(ISD::ABS, MVT::i32, Expand);
-
   // EXTLOAD should be the same as ZEXTLOAD. It is legal for some address
   // spaces, so it is custom lowered to handle those where it isn't.
   for (auto Op : {ISD::SEXTLOAD, ISD::ZEXTLOAD, ISD::EXTLOAD})

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index a757421..be42291 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -298,7 +298,7 @@
   setOperationAction(ISD::BR_CC,
                      {MVT::i1, MVT::i32, MVT::i64, MVT::f32, MVT::f64}, Expand);
 
-  setOperationAction({ISD::UADDO, ISD::USUBO}, MVT::i32, Legal);
+  setOperationAction({ISD::ABS, ISD::UADDO, ISD::USUBO}, MVT::i32, Legal);
 
   setOperationAction({ISD::UADDO_CARRY, ISD::USUBO_CARRY}, MVT::i32, Legal);