AMDGPU: Fold more custom nodes to undef

This will help sneak undefs past GVN into the DAG for
some tests.

Also add missing intrinsic for rsq_legacy, even though the node
was already selected to the instruction. Also start passing
the debug location to intrinsic errors.

llvm-svn: 273181

1 files changed, 9 insertions, 1 deletions

diff --git a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ldexp.ll b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ldexp.ll
index c48d52d150b..511418f8d1e 100644
--- a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ldexp.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ldexp.ll
@@ -1,4 +1,4 @@
-; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
+; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 ; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 
 declare float @llvm.amdgcn.ldexp.f32(float, i32) nounwind readnone
@@ -42,3 +42,11 @@ define void @test_legacy_ldexp_f64(double addrspace(1)* %out, double %a, i32 %b)
   store double %result, double addrspace(1)* %out, align 8
   ret void
 }
+
+; SI-LABEL: {{^}}test_ldexp_undef_f32:
+; SI-NOT: v_ldexp_f32
+define void @test_ldexp_undef_f32(float addrspace(1)* %out, i32 %b) nounwind {
+  %result = call float @llvm.amdgcn.ldexp.f32(float undef, i32 %b) nounwind readnone
+  store float %result, float addrspace(1)* %out, align 4
+  ret void
+}