diff --git a/lib/Target/R600/SIInstructions.td b/lib/Target/R600/SIInstructions.td
index 188c2cdae19..75764a430c4 100644
--- a/lib/Target/R600/SIInstructions.td
+++ b/lib/Target/R600/SIInstructions.td
@@ -3230,6 +3230,12 @@ def : Pat <
   (V_CMP_EQ_I32_e64 (V_AND_B32_e64 (i32 1), $a), 1)
 >;
 
+def : Pat <
+  (i1 (trunc i64:$a)),
+  (V_CMP_EQ_I32_e64 (V_AND_B32_e64 (i32 1),
+                    (EXTRACT_SUBREG $a, sub0)), 1)
+>;
+
 def : Pat <
   (i32 (bswap i32:$a)),
   (V_BFI_B32 (S_MOV_B32 0x00ff00ff),
diff --git a/test/CodeGen/R600/trunc.ll b/test/CodeGen/R600/trunc.ll
index eb7e4ed8f9f..fa44264e365 100644
--- a/test/CodeGen/R600/trunc.ll
+++ b/test/CodeGen/R600/trunc.ll
@@ -1,6 +1,8 @@
 ; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI %s
 ; RUN: llc -march=r600 -mcpu=cypress < %s | FileCheck -check-prefix=EG %s
 
+declare i32 @llvm.r600.read.tidig.x() nounwind readnone
+
 define void @trunc_i64_to_i32_store(i32 addrspace(1)* %out, i64 %in) {
 ; SI-LABEL: {{^}}trunc_i64_to_i32_store:
 ; SI: s_load_dword [[SLOAD:s[0-9]+]], s[0:1], 0xb
@@ -67,3 +69,32 @@ define void @sgpr_trunc_i32_to_i1(i32 addrspace(1)* %out, i32 %a) {
   store i32 %result, i32 addrspace(1)* %out, align 4
   ret void
 }
+
+; SI-LABEL: {{^}}s_trunc_i64_to_i1:
+; SI: s_load_dwordx2 s{{\[}}[[SLO:[0-9]+]]:{{[0-9]+\]}}, {{s\[[0-9]+:[0-9]+\]}}, 0xb
+; SI: v_and_b32_e64 [[MASKED:v[0-9]+]], 1, s[[SLO]]
+; SI: v_cmp_eq_i32_e64 [[CMP:s\[[0-9]+:[0-9]+\]]], [[MASKED]], 1
+; SI: v_cndmask_b32_e64 {{v[0-9]+}}, -12, 63, [[CMP]]
+define void @s_trunc_i64_to_i1(i32 addrspace(1)* %out, i64 %x) {
+  %trunc = trunc i64 %x to i1
+  %sel = select i1 %trunc, i32 63, i32 -12
+  store i32 %sel, i32 addrspace(1)* %out
+  ret void
+}
+
+; SI-LABEL: {{^}}v_trunc_i64_to_i1:
+; SI: buffer_load_dwordx2 v{{\[}}[[VLO:[0-9]+]]:{{[0-9]+\]}}
+; SI: v_and_b32_e32 [[MASKED:v[0-9]+]], 1, v[[VLO]]
+; SI: v_cmp_eq_i32_e64 [[CMP:s\[[0-9]+:[0-9]+\]]], [[MASKED]], 1
+; SI: v_cndmask_b32_e64 {{v[0-9]+}}, -12, 63, [[CMP]]
+define void @v_trunc_i64_to_i1(i32 addrspace(1)* %out, i64 addrspace(1)* %in) {
+  %tid = call i32 @llvm.r600.read.tidig.x() nounwind readnone
+  %gep = getelementptr i64 addrspace(1)* %in, i32 %tid
+  %out.gep = getelementptr i32 addrspace(1)* %out, i32 %tid
+  %x = load i64 addrspace(1)* %gep
+
+  %trunc = trunc i64 %x to i1
+  %sel = select i1 %trunc, i32 63, i32 -12
+  store i32 %sel, i32 addrspace(1)* %out.gep
+  ret void
+}