AMDGPU: Remove undef in subreg-coalescer-crash.ll (#131256)

Author: arsenm

llvm/test/CodeGen/AMDGPU/subreg-coalescer-crash.ll

@@ -9,17 +9,19 @@ define amdgpu_kernel void @row_filter_C1_D0() #0 {
 ; GCN-NEXT:  ; %bb.1: ; %do.body.preheader
 ; GCN-NEXT:  .LBB0_2: ; %for.inc.1
 entry:
-  br i1 undef, label %for.inc.1, label %do.body.preheader
+  br i1 poison, label %for.inc.1, label %do.body.preheader
 
 do.body.preheader:                                ; preds = %entry
   %tmp = insertelement <4 x i32> zeroinitializer, i32 poison, i32 1
-  br i1 undef, label %do.body56.1, label %do.body90
+  %undef1 = freeze i1 poison
+  br i1 %undef1, label %do.body56.1, label %do.body90
 
 do.body90:                                        ; preds = %do.body56.2, %do.body56.1, %do.body.preheader
   %tmp1 = phi <4 x i32> [ %tmp6, %do.body56.2 ], [ %tmp5, %do.body56.1 ], [ %tmp, %do.body.preheader ]
   %tmp2 = insertelement <4 x i32> %tmp1, i32 poison, i32 2
   %tmp3 = insertelement <4 x i32> %tmp2, i32 poison, i32 3
-  br i1 undef, label %do.body124.1, label %do.body.1562.preheader
+  %undef3 = freeze i1 poison
+  br i1 %undef3, label %do.body124.1, label %do.body.1562.preheader
 
 do.body.1562.preheader:                           ; preds = %do.body124.1, %do.body90
   %storemerge = phi <4 x i32> [ %tmp3, %do.body90 ], [ %tmp7, %do.body124.1 ]
@@ -28,7 +30,7 @@ do.body.1562.preheader:                           ; preds = %do.body124.1, %do.b
 
 do.body56.1:                                      ; preds = %do.body.preheader
   %tmp5 = insertelement <4 x i32> %tmp, i32 poison, i32 1
-  %or.cond472.1 = or i1 undef, undef
+  %or.cond472.1 = or i1 poison, poison
   br i1 %or.cond472.1, label %do.body56.2, label %do.body90
 
 do.body56.2:                                      ; preds = %do.body56.1
@@ -41,7 +43,8 @@ do.body124.1:                                     ; preds = %do.body90
 
 for.inc.1:                                        ; preds = %do.body.1562.preheader, %entry
   %storemerge591 = phi <4 x i32> [ zeroinitializer, %entry ], [ %storemerge, %do.body.1562.preheader ]
-  %add.i495 = add <4 x i32> %storemerge591, undef
+  %undef2 = freeze <4 x i32> poison
+  %add.i495 = add <4 x i32> %storemerge591, %undef2
   unreachable
 }
 
@@ -68,24 +71,27 @@ define amdgpu_ps void @foo() #0 {
 ; GCN-NEXT:    exp mrt0 v1, v0, v0, v0 done vm
 ; GCN-NEXT:    s_endpgm
 bb:
-  br i1 undef, label %bb2, label %bb1
+  %undef0 = freeze i1 poison
+  br i1 %undef0, label %bb2, label %bb1
 
 bb1:                                              ; preds = %bb
-  br i1 undef, label %bb4, label %bb6
+  %undef1 = freeze i1 poison
+  br i1 %undef1, label %bb4, label %bb6
 
 bb2:                                              ; preds = %bb4, %bb
   %tmp = phi float [ %tmp5, %bb4 ], [ 0.000000e+00, %bb ]
-  br i1 undef, label %bb9, label %bb13
+  br i1 poison, label %bb9, label %bb13
 
 bb4:                                              ; preds = %bb7, %bb6, %bb1
   %tmp5 = phi float [ poison, %bb1 ], [ poison, %bb6 ], [ %tmp8, %bb7 ]
   br label %bb2
 
 bb6:                                              ; preds = %bb1
-  br i1 undef, label %bb7, label %bb4
+  %undef2 = freeze i1 poison
+  br i1 %undef2, label %bb7, label %bb4
 
 bb7:                                              ; preds = %bb6
-  %tmp8 = fmul float undef, undef
+  %tmp8 = fmul float poison, poison
   br label %bb4
 
 bb9:                                              ; preds = %bb2
@@ -95,7 +101,7 @@ bb9:                                              ; preds = %bb2
   br label %bb14
 
 bb13:                                             ; preds = %bb2
-  br i1 undef, label %bb23, label %bb24
+  br i1 poison, label %bb23, label %bb24
 
 bb14:                                             ; preds = %bb27, %bb24, %bb9
   %tmp15 = phi float [ %tmp12, %bb9 ], [ poison, %bb27 ], [ 0.000000e+00, %bb24 ]
@@ -106,11 +112,11 @@ bb14:                                             ; preds = %bb27, %bb24, %bb9
   ret void
 
 bb23:                                             ; preds = %bb13
-  br i1 undef, label %bb24, label %bb26
+  br i1 poison, label %bb24, label %bb26
 
 bb24:                                             ; preds = %bb26, %bb23, %bb13
   %tmp25 = phi float [ %tmp, %bb13 ], [ %tmp, %bb26 ], [ 0.000000e+00, %bb23 ]
-  br i1 undef, label %bb27, label %bb14
+  br i1 poison, label %bb27, label %bb14
 
 bb26:                                             ; preds = %bb23
   br label %bb24