AMDGPU/GlobalISel: Mark 32-bit G_FMUL as legal

Reviewers: arsenm

Reviewed By: arsenm

Subscribers: kzhuravl, wdng, nhaehnle, yaxunl, rovka, kristof.beyls, igorb, dstuttard, tpr, llvm-commits, t-tye

Differential Revision: https://reviews.llvm.org/D36218

llvm-svn: 309898

2 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
index 21b2181b8ef..7d7848cf916 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
@@ -53,6 +53,8 @@ AMDGPULegalizerInfo::AMDGPULegalizerInfo() {
 
   setAction({G_FCONSTANT, S32}, Legal);
 
+  setAction({G_FMUL, S32}, Legal);
+
   setAction({G_GEP, P1}, Legal);
   setAction({G_GEP, P2}, Legal);
   setAction({G_GEP, 1, S64}, Legal);
diff --git a/llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fmul.mir b/llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fmul.mir
new file mode 100644
index 00000000000..2191ff4356c
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fmul.mir
@@ -0,0 +1,22 @@
+# RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=fiji -run-pass=legalizer -global-isel %s -o - | FileCheck %s
+
+--- |
+  define void @test_fmul() { ret void }
+...
+
+---
+name:            test_fmul
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body: |
+  bb.0:
+    liveins: %vgpr0, %vgpr1
+    ; CHECK-LABEL: name: test_fmul
+    ; CHECK: %2(s32) = G_FMUL %0, %1
+
+    %0(s32) = COPY %vgpr0
+    %1(s32) = COPY %vgpr1
+    %2(s32) = G_FMUL %0, %1
+...