[AMDGPU] Fix regression in AMDGPULibCalls allowing native for doubles

Under -cl-fast-relaxed-math we could use native_sqrt, but f64 was
allowed to produce HSAIL's nsqrt instruction. HSAIL is not here
and we stick with non-existing native_sqrt(double) as a result.

Add check for f64 to not return native functions and also remove
handling of f64 case for fold_sqrt.

Differential Revision: https://reviews.llvm.org/D37223

llvm-svn: 311900

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AMDGPU/simplify-libcalls.ll b/llvm/test/CodeGen/AMDGPU/simplify-libcalls.ll
index e487f3c417e..eab1fe4c70f 100644
--- a/llvm/test/CodeGen/AMDGPU/simplify-libcalls.ll
+++ b/llvm/test/CodeGen/AMDGPU/simplify-libcalls.ll
@@ -641,7 +641,18 @@ entry:
   ret void
 }
 
+; GCN-LABEL: {{^}}define amdgpu_kernel void @test_dont_use_native_sqrt_fast_f64
+; GCN: tail call fast double @_Z4sqrtd(double %tmp)
+define amdgpu_kernel void @test_dont_use_native_sqrt_fast_f64(double addrspace(1)* nocapture %a) {
+entry:
+  %tmp = load double, double addrspace(1)* %a, align 8
+  %call = tail call fast double @_Z4sqrtd(double %tmp)
+  store double %call, double addrspace(1)* %a, align 8
+  ret void
+}
+
 declare float @_Z4sqrtf(float)
+declare double @_Z4sqrtd(double)
 
 ; GCN-LABEL: {{^}}define amdgpu_kernel void @test_use_native_rsqrt
 ; GCN-NATIVE: tail call fast float @_Z12native_rsqrtf(float %tmp)