[PATCH] D105424: [DAGCombiner] Pre-commit test to demonstrate mulhi const folding

[David Stuttard via Phabricator via llvm-commits]

dstuttard created this revision.
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dstuttard requested review of this revision.
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D103323 <https://reviews.llvm.org/D103323> will fold this


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105424

Files:
  llvm/test/CodeGen/AMDGPU/udiv.ll


Index: llvm/test/CodeGen/AMDGPU/udiv.ll
===================================================================
--- llvm/test/CodeGen/AMDGPU/udiv.ll
+++ llvm/test/CodeGen/AMDGPU/udiv.ll
@@ -200,3 +200,18 @@
   store i8 %tmp6, i8 addrspace(1)* null, align 1
   ret void
 }
+
+define i64 @v_test_udiv64_mulhi_fold(i64 %arg) {
+; GCN-LABEL: v_test_udiv64_mulhi_fold
+; GFX1030: s_mov_b32 [[VAL1:s[0-9]+]], 0xa9000000
+; GFX1030: s_brev_b32 [[VAL2:s[0-9]+]], 6
+; GFX1030: s_movk_i32 [[VAL3:s[0-9]+]], 0x500
+; GFX1030: s_mul_hi_u32 s7, [[VAL1]], [[VAL2]]
+; GFX1030: s_mov_b32 [[VAL4:s[0-9]+]], 0xa7c5
+; GFX1030: s_mul_hi_u32 s8, [[VAL1]], [[VAL3]]
+; GFX1030: s_mul_hi_u32 s5, [[VAL4]], [[VAL2]]
+; GFX1030: s_mul_hi_u32 s6, [[VAL4]], [[VAL3]]
+; GFX1030: v_add_co_u32 v{{[0-9]+}}, s{{[0-9]+}}, s{{[0-9]+}}, s{{[0-9]+}}
+  %d = udiv i64 %arg, 100000
+  ret i64 %d
+}


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