Replace undef with poison

Author: leewei05

llvm/test/CodeGen/X86/AMX/amx-combine-undef.ll

@@ -28,7 +28,7 @@ l1:
   br i1 poison, label %l2, label %l3
 
 l2:
-  %t3 = phi <256 x i32> [ undef, %entry ], [ %t2, %l1 ]
+  %t3 = phi <256 x i32> [ poison, %entry ], [ %t2, %l1 ]
   br i1 poison, label %l3, label %exit
 
 l3:
@@ -65,7 +65,7 @@ l1:
   br i1 poison, label %l2, label %exit
 
 l2:
-  %t3 = phi <256 x i32> [ undef, %entry ], [ %t2, %l1 ]
+  %t3 = phi <256 x i32> [ poison, %entry ], [ %t2, %l1 ]
   %t4 = call x86_amx @llvm.x86.cast.vector.to.tile.v256i32(<256 x i32> %t3)
   call void @llvm.x86.tilestored64.internal(i16 8, i16 32, ptr %buf, i64 1024, x86_amx %t4)
   br label %exit
@@ -119,7 +119,7 @@ define void @foo_vrow(ptr%buf, i16 %row) {
 ; CHECK-NEXT:    [[TMP3:%.*]] = load <256 x i32>, ptr [[TMP1]], align 1024
 ; CHECK-NEXT:    br i1 poison, label [[L2]], label [[EXIT:%.*]]
 ; CHECK:       l2:
-; CHECK-NEXT:    [[T3:%.*]] = phi <256 x i32> [ undef, [[ENTRY:%.*]] ], [ [[TMP3]], [[L1]] ]
+; CHECK-NEXT:    [[T3:%.*]] = phi <256 x i32> [ poison, [[ENTRY:%.*]] ], [ [[TMP3]], [[L1]] ]
 ; CHECK-NEXT:    store <256 x i32> [[T3]], ptr [[TMP0]], align 1024
 ; CHECK-NEXT:    [[TMP5:%.*]] = call x86_amx @llvm.x86.tileloadd64.internal(i16 [[ROW]], i16 32, ptr [[TMP0]], i64 32)
 ; CHECK-NEXT:    call void @llvm.x86.tilestored64.internal(i16 [[ROW]], i16 32, ptr [[BUF:%.*]], i64 1024, x86_amx [[TMP5]])
@@ -136,7 +136,7 @@ l1:
   br i1 poison, label %l2, label %exit
 
 l2:
-  %t3 = phi <256 x i32> [ undef, %entry ], [ %t2, %l1 ]
+  %t3 = phi <256 x i32> [ poison, %entry ], [ %t2, %l1 ]
   %t4 = call x86_amx @llvm.x86.cast.vector.to.tile.v256i32(<256 x i32> %t3)
   call void @llvm.x86.tilestored64.internal(i16 %row, i16 32, ptr %buf, i64 1024, x86_amx %t4)
   br label %exit
@@ -196,7 +196,7 @@ define void @noshape(ptr%buf) {
 ; CHECK-NEXT:    [[TMP2:%.*]] = load <256 x i32>, ptr [[TMP0]], align 1024
 ; CHECK-NEXT:    br i1 poison, label [[L2]], label [[EXIT:%.*]]
 ; CHECK:       l2:
-; CHECK-NEXT:    [[T3:%.*]] = phi <256 x i32> [ undef, [[ENTRY:%.*]] ], [ [[TMP2]], [[L1]] ]
+; CHECK-NEXT:    [[T3:%.*]] = phi <256 x i32> [ poison, [[ENTRY:%.*]] ], [ [[TMP2]], [[L1]] ]
 ; CHECK-NEXT:    store <256 x i32> [[T3]], ptr [[BUF:%.*]], align 1024
 ; CHECK-NEXT:    br label [[EXIT]]
 ; CHECK:       exit:
@@ -211,7 +211,7 @@ l1:
   br i1 poison, label %l2, label %exit
 
 l2:
-  %t3 = phi <256 x i32> [ undef, %entry ], [ %t2, %l1 ]
+  %t3 = phi <256 x i32> [ poison, %entry ], [ %t2, %l1 ]
   %t4 = call x86_amx @llvm.x86.cast.vector.to.tile.v256i32(<256 x i32> %t3)
   %t5 = call <256 x i32> @llvm.x86.cast.tile.to.vector.v256i32(x86_amx %t4)
   store <256 x i32> %t5, ptr %buf
@@ -232,7 +232,7 @@ define void @noshape2(ptr%buf) {
 ; CHECK-NEXT:    [[TMP2:%.*]] = load <256 x i32>, ptr [[TMP0]], align 1024
 ; CHECK-NEXT:    br i1 poison, label [[L2]], label [[EXIT:%.*]]
 ; CHECK:       l2:
-; CHECK-NEXT:    [[T3:%.*]] = phi <256 x i32> [ undef, [[ENTRY:%.*]] ], [ [[TMP2]], [[L1]] ]
+; CHECK-NEXT:    [[T3:%.*]] = phi <256 x i32> [ poison, [[ENTRY:%.*]] ], [ [[TMP2]], [[L1]] ]
 ; CHECK-NEXT:    [[T6:%.*]] = call <256 x i32> @llvm.abs.v256i32(<256 x i32> [[T3]], i1 true)
 ; CHECK-NEXT:    store <256 x i32> [[T6]], ptr [[BUF:%.*]], align 1024
 ; CHECK-NEXT:    br label [[EXIT]]
@@ -248,7 +248,7 @@ l1:
   br i1 poison, label %l2, label %exit
 
 l2:
-  %t3 = phi <256 x i32> [ undef, %entry ], [ %t2, %l1 ]
+  %t3 = phi <256 x i32> [ poison, %entry ], [ %t2, %l1 ]
   %t4 = call x86_amx @llvm.x86.cast.vector.to.tile.v256i32(<256 x i32> %t3)
   %t5 = call <256 x i32> @llvm.x86.cast.tile.to.vector.v256i32(x86_amx %t4)
   %t6 = call <256 x i32> @llvm.abs.v256i32(<256 x i32> %t5, i1 1)