[llvm] AMDGPU: Replace undef phi inputs with poison in tests (PR #130267)

via llvm-commits llvm-commits at lists.llvm.org
Fri Mar 7 01:54:10 PST 2025


llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Matt Arsenault (arsenm)

<details>
<summary>Changes</summary>

I think the chance of this changing the tests in meaningful ways
is very low. This was perl with a few minor adjustments to a few
tests that produce new undefs. Only one test had a minor codegen
change with the switch, which I dropped from the change.

---

Patch is 41.99 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/130267.diff


35 Files Affected:

- (modified) llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll (+4-4) 
- (modified) llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-break-large-phis.ll (+4-4) 
- (modified) llvm/test/CodeGen/AMDGPU/amdpal_scratch_mergedshader.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/branch-relaxation.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/bug-deadlanes.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/coalescer_distribute.ll (+4-4) 
- (modified) llvm/test/CodeGen/AMDGPU/combine-add-zext-xor.ll (+6-6) 
- (modified) llvm/test/CodeGen/AMDGPU/cse-phi-incoming-val.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/dagcomb-shuffle-vecextend-non2.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/dagcombine-fma-crash.ll (+2-2) 
- (modified) llvm/test/CodeGen/AMDGPU/divergent-branch-uniform-condition.ll (+2-2) 
- (modified) llvm/test/CodeGen/AMDGPU/fold-fabs.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/i1-copy-phi.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/implicit-def-muse.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/inline-asm.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.ordered.swap.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/madmk.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll (+5-5) 
- (modified) llvm/test/CodeGen/AMDGPU/move-to-valu-worklist.ll (+2-2) 
- (modified) llvm/test/CodeGen/AMDGPU/multilevel-break.ll (+2-2) 
- (modified) llvm/test/CodeGen/AMDGPU/nested-loop-conditions.ll (+2-2) 
- (modified) llvm/test/CodeGen/AMDGPU/rewrite-undef-for-phi.ll (+4-4) 
- (modified) llvm/test/CodeGen/AMDGPU/schedule-vs-if-nested-loop-failure.ll (+10-10) 
- (modified) llvm/test/CodeGen/AMDGPU/sdwa-peephole.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/select-undef.ll (+18-18) 
- (modified) llvm/test/CodeGen/AMDGPU/si-spill-cf.ll (+3-3) 
- (modified) llvm/test/CodeGen/AMDGPU/simplifydemandedbits-recursion.ll (+2-2) 
- (modified) llvm/test/CodeGen/AMDGPU/skip-if-dead.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/subreg-coalescer-crash.ll (+3-3) 
- (modified) llvm/test/CodeGen/AMDGPU/switch-default-block-unreachable.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/tuple-allocation-failure.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/uniform-phi-with-undef.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/unigine-liveness-crash.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/vgpr-liverange-ir.ll (+1-1) 
- (modified) llvm/test/CodeGen/AMDGPU/wave32.ll (+2-2) 


``````````diff
diff --git a/llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll b/llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll
index e7ddfda2875db..cc768a2cdf61f 100644
--- a/llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll
+++ b/llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll
@@ -26,7 +26,7 @@ if.true:
   br label %endif
 
 endif:
-  %v = phi i32 [ %val, %if.true ], [ undef, %entry ]
+  %v = phi i32 [ %val, %if.true ], [ poison, %entry ]
   ret i32 %v
 }
 
@@ -49,7 +49,7 @@ entry:
   br i1 %c, label %if.true, label %endif
 
 endif:
-  %v = phi i32 [ %val, %if.true ], [ undef, %entry ]
+  %v = phi i32 [ %val, %if.true ], [ poison, %entry ]
   ret i32 %v
 
 if.true:
@@ -82,7 +82,7 @@ if.true:
   br label %endif
 
 endif:
-  %v = phi i32 [ %val, %if.true ], [ undef, %entry ]
+  %v = phi i32 [ %val, %if.true ], [ poison, %entry ]
   ret i32 %v
 }
 
@@ -114,7 +114,7 @@ if.true:
   br label %endif
 
 endif:
-  %v = phi i32 [ %val, %if.true ], [ undef, %entry ]
+  %v = phi i32 [ %val, %if.true ], [ poison, %entry ]
   ret i32 %v
 }
 
diff --git a/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-break-large-phis.ll b/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-break-large-phis.ll
index 11772d252a16f..dc2a6137dba3b 100644
--- a/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-break-large-phis.ll
+++ b/llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-break-large-phis.ll
@@ -643,11 +643,11 @@ define amdgpu_kernel void @phi_v15i8_random_constant_init(<15 x i8> %in, ptr %ou
 ; OPT-NEXT:    br label [[FINALLY]]
 ; OPT:       finally:
 ; OPT-NEXT:    [[TMP0:%.*]] = phi <4 x i8> [ <i8 poison, i8 1, i8 2, i8 3>, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE1]], [[ELSE]] ]
-; OPT-NEXT:    [[TMP1:%.*]] = phi <4 x i8> [ <i8 4, i8 undef, i8 6, i8 7>, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE3]], [[ELSE]] ]
+; OPT-NEXT:    [[TMP1:%.*]] = phi <4 x i8> [ <i8 4, i8 poison, i8 6, i8 7>, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE3]], [[ELSE]] ]
 ; OPT-NEXT:    [[TMP2:%.*]] = phi <4 x i8> [ <i8 9, i8 10, i8 11, i8 12>, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE5]], [[ELSE]] ]
 ; OPT-NEXT:    [[TMP3:%.*]] = phi i8 [ 13, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE7]], [[ELSE]] ]
 ; OPT-NEXT:    [[TMP4:%.*]] = phi i8 [ 14, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE9]], [[ELSE]] ]
-; OPT-NEXT:    [[TMP5:%.*]] = phi i8 [ undef, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE11]], [[ELSE]] ]
+; OPT-NEXT:    [[TMP5:%.*]] = phi i8 [ poison, [[THEN]] ], [ [[LARGEPHI_EXTRACTSLICE11]], [[ELSE]] ]
 ; OPT-NEXT:    [[LARGEPHI_INSERTSLICE0:%.*]] = call <15 x i8> @llvm.vector.insert.v15i8.v4i8(<15 x i8> poison, <4 x i8> [[TMP0]], i64 0)
 ; OPT-NEXT:    [[LARGEPHI_INSERTSLICE1:%.*]] = call <15 x i8> @llvm.vector.insert.v15i8.v4i8(<15 x i8> [[LARGEPHI_INSERTSLICE0]], <4 x i8> [[TMP1]], i64 4)
 ; OPT-NEXT:    [[LARGEPHI_INSERTSLICE2:%.*]] = call <15 x i8> @llvm.vector.insert.v15i8.v4i8(<15 x i8> [[LARGEPHI_INSERTSLICE1]], <4 x i8> [[TMP2]], i64 8)
@@ -666,7 +666,7 @@ define amdgpu_kernel void @phi_v15i8_random_constant_init(<15 x i8> %in, ptr %ou
 ; NOOPT-NEXT:    [[Y:%.*]] = insertelement <15 x i8> [[IN:%.*]], i8 64, i32 6
 ; NOOPT-NEXT:    br label [[FINALLY]]
 ; NOOPT:       finally:
-; NOOPT-NEXT:    [[VAL:%.*]] = phi <15 x i8> [ <i8 poison, i8 1, i8 2, i8 3, i8 4, i8 undef, i8 6, i8 7, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 undef>, [[THEN]] ], [ [[Y]], [[ELSE]] ]
+; NOOPT-NEXT:    [[VAL:%.*]] = phi <15 x i8> [ <i8 poison, i8 1, i8 2, i8 3, i8 4, i8 poison, i8 6, i8 7, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 poison>, [[THEN]] ], [ [[Y]], [[ELSE]] ]
 ; NOOPT-NEXT:    store <15 x i8> [[VAL]], ptr [[OUT:%.*]], align 1
 ; NOOPT-NEXT:    ret void
 ;
@@ -678,7 +678,7 @@ else:
   %y = insertelement <15 x i8> %in, i8 64, i32 6
   br label %finally
 finally:
-  %val = phi <15 x i8> [<i8 poison, i8 1, i8 2, i8 3, i8 4, i8 undef, i8 6, i8 7, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 undef>, %then], [%y, %else]
+  %val = phi <15 x i8> [<i8 poison, i8 1, i8 2, i8 3, i8 4, i8 poison, i8 6, i8 7, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 poison>, %then], [%y, %else]
   store <15 x i8> %val, ptr %out, align 1
   ret void
 }
diff --git a/llvm/test/CodeGen/AMDGPU/amdpal_scratch_mergedshader.ll b/llvm/test/CodeGen/AMDGPU/amdpal_scratch_mergedshader.ll
index 20e1d6abc7978..2aea4497c12ba 100644
--- a/llvm/test/CodeGen/AMDGPU/amdpal_scratch_mergedshader.ll
+++ b/llvm/test/CodeGen/AMDGPU/amdpal_scratch_mergedshader.ll
@@ -28,7 +28,7 @@ define amdgpu_hs void @_amdgpu_hs_main(i32 inreg %arg, i32 inreg %arg1, i32 inre
   br label %bb
 
 bb:                                               ; preds = %bb, %.endls
-  %lsr.iv182 = phi ptr addrspace(5) [ undef, %bb ], [ %__llpc_global_proxy_7.i, %.endls ]
+  %lsr.iv182 = phi ptr addrspace(5) [ poison, %bb ], [ %__llpc_global_proxy_7.i, %.endls ]
   %scevgep183 = getelementptr [3 x <4 x float>], ptr addrspace(5) %lsr.iv182, i32 0, i32 1
   br label %bb
 }
diff --git a/llvm/test/CodeGen/AMDGPU/branch-relaxation.ll b/llvm/test/CodeGen/AMDGPU/branch-relaxation.ll
index a03ad4daab014..2cd15210eb8e5 100644
--- a/llvm/test/CodeGen/AMDGPU/branch-relaxation.ll
+++ b/llvm/test/CodeGen/AMDGPU/branch-relaxation.ll
@@ -1529,7 +1529,7 @@ bb14:                                             ; preds = %bb13, %bb9
   br label %bb19
 
 bb19:                                             ; preds = %bb14, %bb13, %bb9
-  %tmp20 = phi i32 [ undef, %bb9 ], [ undef, %bb13 ], [ %tmp18, %bb14 ]
+  %tmp20 = phi i32 [ poison, %bb9 ], [ poison, %bb13 ], [ %tmp18, %bb14 ]
   %tmp21 = getelementptr inbounds i32, ptr addrspace(1) %arg, i64 %arg5
   store i32 %tmp20, ptr addrspace(1) %tmp21, align 4
   ret void
diff --git a/llvm/test/CodeGen/AMDGPU/bug-deadlanes.ll b/llvm/test/CodeGen/AMDGPU/bug-deadlanes.ll
index 98590c227859b..831017fae3111 100644
--- a/llvm/test/CodeGen/AMDGPU/bug-deadlanes.ll
+++ b/llvm/test/CodeGen/AMDGPU/bug-deadlanes.ll
@@ -18,7 +18,7 @@ define dllexport amdgpu_ps void @_amdgpu_ps_main(i32 %descTable2) #0 {
 
 bb1750:                                           ; preds = %bb1897, %.entry
   %__llpc_global_proxy_r3.12.vec.extract2358295 = phi i32 [ 0, %.entry ], [ %__llpc_global_proxy_r3.12.vec.extract2358, %bb1897 ]
-  %__llpc_global_proxy_r13.20293 = phi <4 x i32> [ undef, %.entry ], [ %__llpc_global_proxy_r13.22, %bb1897 ]
+  %__llpc_global_proxy_r13.20293 = phi <4 x i32> [ poison, %.entry ], [ %__llpc_global_proxy_r13.22, %bb1897 ]
   %__llpc_global_proxy_r10.19291 = phi <4 x i32> [ poison, %.entry ], [ %i1914, %bb1897 ]
   %i1751 = call float @llvm.amdgcn.struct.buffer.load.format.f32(<4 x i32> %i1746, i32 poison, i32 0, i32 0, i32 0)
   %i1754 = shufflevector <4 x i32> %__llpc_global_proxy_r10.19291, <4 x i32> poison, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
diff --git a/llvm/test/CodeGen/AMDGPU/coalescer_distribute.ll b/llvm/test/CodeGen/AMDGPU/coalescer_distribute.ll
index 2d8ef336f52d6..8f4d10411ed73 100644
--- a/llvm/test/CodeGen/AMDGPU/coalescer_distribute.ll
+++ b/llvm/test/CodeGen/AMDGPU/coalescer_distribute.ll
@@ -15,7 +15,7 @@ bb6:
   br label %bb8
 
 bb8:
-  %tmp9 = phi i64 [ %tmp7, %bb6 ], [ undef, %bb2 ]
+  %tmp9 = phi i64 [ %tmp7, %bb6 ], [ poison, %bb2 ]
   %tmp10 = icmp eq i32 %tmp, 0
   br i1 %tmp10, label %bb11, label %bb23
 
@@ -26,16 +26,16 @@ bb17:
   br label %bb20
 
 bb20:
-  %tmp21 = phi i64 [ undef, %bb17 ], [ %tmp9, %bb11 ]
+  %tmp21 = phi i64 [ poison, %bb17 ], [ %tmp9, %bb11 ]
   %tmp22 = trunc i64 %tmp21 to i32
   br label %bb23
 
 bb23:
-  %tmp24 = phi i32 [ %tmp22, %bb20 ], [ undef, %bb8 ], [ undef, %bb ]
+  %tmp24 = phi i32 [ %tmp22, %bb20 ], [ poison, %bb8 ], [ poison, %bb ]
   br label %bb25
 
 bb25:
-  %tmp26 = phi i32 [ %tmp24, %bb23 ], [ undef, %bb25 ]
+  %tmp26 = phi i32 [ %tmp24, %bb23 ], [ poison, %bb25 ]
   br i1 %c3, label %bb25, label %bb30
 
 bb30:
diff --git a/llvm/test/CodeGen/AMDGPU/combine-add-zext-xor.ll b/llvm/test/CodeGen/AMDGPU/combine-add-zext-xor.ll
index a25078230385e..b42542db6dbd8 100644
--- a/llvm/test/CodeGen/AMDGPU/combine-add-zext-xor.ll
+++ b/llvm/test/CodeGen/AMDGPU/combine-add-zext-xor.ll
@@ -71,7 +71,7 @@ bb:                                               ; preds = %.a
   br label %bb9
 
 bb9:                                              ; preds = %bb, %.a
-  %.2.0.in.in = phi i1 [ %i5, %bb ], [ undef, %.a ]
+  %.2.0.in.in = phi i1 [ %i5, %bb ], [ poison, %.a ]
   %.2.0.in = xor i1 %.2.0.in.in, true
   %.2.0 = zext i1 %.2.0.in to i32
   %i11 = add i32 %.2, %.2.0
@@ -151,7 +151,7 @@ bb:                                               ; preds = %.a
   br label %bb9
 
 bb9:                                              ; preds = %bb, %.a
-  %.2.0.in.in = phi i1 [ %i5, %bb ], [ undef, %.a ]
+  %.2.0.in.in = phi i1 [ %i5, %bb ], [ poison, %.a ]
   %.2.0.in = xor i1 %.2.0.in.in, true
   %.2.0 = zext i1 %.2.0.in to i32
   %i11 = sub i32 %.2, %.2.0
@@ -234,7 +234,7 @@ bb:                                               ; preds = %.a
   br label %bb9
 
 bb9:                                              ; preds = %bb, %.a
-  %.2.0.in.in = phi i1 [ %i5, %bb ], [ undef, %.a ]
+  %.2.0.in.in = phi i1 [ %i5, %bb ], [ poison, %.a ]
   %t = icmp sgt i32 %.2, -1050
   %.2.0.in = or i1 %.2.0.in.in, %t
   %.2.0 = zext i1 %.2.0.in to i32
@@ -318,7 +318,7 @@ bb:                                               ; preds = %.a
   br label %bb9
 
 bb9:                                              ; preds = %bb, %.a
-  %.2.0.in.in = phi i1 [ %i5, %bb ], [ undef, %.a ]
+  %.2.0.in.in = phi i1 [ %i5, %bb ], [ poison, %.a ]
   %t = icmp sgt i32 %.2, -1050
   %.2.0.in = or i1 %.2.0.in.in, %t
   %.2.0 = zext i1 %.2.0.in to i32
@@ -397,7 +397,7 @@ bb:                                               ; preds = %.a
   br label %bb9
 
 bb9:                                              ; preds = %bb, %.a
-  %.2.0.in.in = phi i1 [ %i5, %bb ], [ undef, %.a ]
+  %.2.0.in.in = phi i1 [ %i5, %bb ], [ poison, %.a ]
   %t = icmp sgt i32 %.2, -1050
   %.2.0.in = and i1 %.2.0.in.in, %t
   %.2.0 = zext i1 %.2.0.in to i32
@@ -476,7 +476,7 @@ bb:                                               ; preds = %.a
   br label %bb9
 
 bb9:                                              ; preds = %bb, %.a
-  %.2.0.in.in = phi i1 [ %i5, %bb ], [ undef, %.a ]
+  %.2.0.in.in = phi i1 [ %i5, %bb ], [ poison, %.a ]
   %t = icmp sgt i32 %.2, -1050
   %.2.0.in = and i1 %.2.0.in.in, %t
   %.2.0 = zext i1 %.2.0.in to i32
diff --git a/llvm/test/CodeGen/AMDGPU/cse-phi-incoming-val.ll b/llvm/test/CodeGen/AMDGPU/cse-phi-incoming-val.ll
index 4f0d040e3217c..c73a3b69d3716 100644
--- a/llvm/test/CodeGen/AMDGPU/cse-phi-incoming-val.ll
+++ b/llvm/test/CodeGen/AMDGPU/cse-phi-incoming-val.ll
@@ -30,7 +30,7 @@ bb9:                                              ; preds = %bb5
   br label %bb10
 
 bb10:                                             ; preds = %bb9, %bb5, %bb3, %bb
-  %tmp11 = phi float [ 1.000000e+00, %bb3 ], [ 0.000000e+00, %bb9 ], [ 1.000000e+00, %bb ], [ undef, %bb5 ]
+  %tmp11 = phi float [ 1.000000e+00, %bb3 ], [ 0.000000e+00, %bb9 ], [ 1.000000e+00, %bb ], [ poison, %bb5 ]
   call void @llvm.amdgcn.exp.f32(i32 40, i32 15, float %tmp11, float undef, float undef, float undef, i1 false, i1 false) #0
   ret void
 }
diff --git a/llvm/test/CodeGen/AMDGPU/dagcomb-shuffle-vecextend-non2.ll b/llvm/test/CodeGen/AMDGPU/dagcomb-shuffle-vecextend-non2.ll
index 009590ed9e410..7d14a5b811b7f 100644
--- a/llvm/test/CodeGen/AMDGPU/dagcomb-shuffle-vecextend-non2.ll
+++ b/llvm/test/CodeGen/AMDGPU/dagcomb-shuffle-vecextend-non2.ll
@@ -25,7 +25,7 @@ bb:
   br label %bb12
 
 bb12:
-  %__llpc_global_proxy_r2.0 = phi <4 x i32> [ %__llpc_global_proxy_r2.0.vec.insert196, %bb ], [ undef, %.entry ]
+  %__llpc_global_proxy_r2.0 = phi <4 x i32> [ %__llpc_global_proxy_r2.0.vec.insert196, %bb ], [ poison, %.entry ]
   %tmp6 = shufflevector <4 x i32> %__llpc_global_proxy_r2.0, <4 x i32> undef, <3 x i32> <i32 1, i32 2, i32 3>
   %tmp7 = bitcast <3 x i32> %tmp6 to <3 x float>
   %a0.i = extractelement <3 x float> %tmp7, i32 0
diff --git a/llvm/test/CodeGen/AMDGPU/dagcombine-fma-crash.ll b/llvm/test/CodeGen/AMDGPU/dagcombine-fma-crash.ll
index 29e4bd55c4b90..142494a803755 100644
--- a/llvm/test/CodeGen/AMDGPU/dagcombine-fma-crash.ll
+++ b/llvm/test/CodeGen/AMDGPU/dagcombine-fma-crash.ll
@@ -64,8 +64,8 @@ bb2:
   br label %bb11
 
 bb11:
-  %i12 = phi float [ %i6, %bb2 ], [ undef, %bb ]
-  %i13 = phi float [ %i10, %bb2 ], [ undef, %bb ]
+  %i12 = phi float [ %i6, %bb2 ], [ poison, %bb ]
+  %i13 = phi float [ %i10, %bb2 ], [ poison, %bb ]
   %i14 = phi i1 [ false, %bb2 ], [ true, %bb ]
   br i1 %i14, label %bb15, label %bb17
 
diff --git a/llvm/test/CodeGen/AMDGPU/divergent-branch-uniform-condition.ll b/llvm/test/CodeGen/AMDGPU/divergent-branch-uniform-condition.ll
index db7897d70fa93..827cb4ac2589a 100644
--- a/llvm/test/CodeGen/AMDGPU/divergent-branch-uniform-condition.ll
+++ b/llvm/test/CodeGen/AMDGPU/divergent-branch-uniform-condition.ll
@@ -78,7 +78,7 @@ loop:                                             ; preds = %Flow, %start
   br i1 %2, label %endif1, label %Flow
 
 Flow1:                                            ; preds = %endif2, %endif1
-  %3 = phi i32 [ %v5, %endif2 ], [ undef, %endif1 ]
+  %3 = phi i32 [ %v5, %endif2 ], [ poison, %endif1 ]
   %4 = phi i1 [ false, %endif2 ], [ true, %endif1 ]
   br label %Flow
 
@@ -107,7 +107,7 @@ endif1:                                           ; preds = %loop
   br i1 %5, label %endif2, label %Flow1
 
 Flow:                                             ; preds = %Flow1, %loop
-  %6 = phi i32 [ %3, %Flow1 ], [ undef, %loop ]
+  %6 = phi i32 [ %3, %Flow1 ], [ poison, %loop ]
   %7 = phi i1 [ %4, %Flow1 ], [ true, %loop ]
   %8 = phi i1 [ false, %Flow1 ], [ true, %loop ]
   br i1 %7, label %Flow2, label %loop
diff --git a/llvm/test/CodeGen/AMDGPU/fold-fabs.ll b/llvm/test/CodeGen/AMDGPU/fold-fabs.ll
index a04bf44549325..6a8594a168f03 100644
--- a/llvm/test/CodeGen/AMDGPU/fold-fabs.ll
+++ b/llvm/test/CodeGen/AMDGPU/fold-fabs.ll
@@ -179,7 +179,7 @@ entry:
   br i1 %4, label %header, label %exit
 
 header:
-  %h.fabs.phi = phi float [ undef, %entry ], [ %l.fabs, %l ]
+  %h.fabs.phi = phi float [ poison, %entry ], [ %l.fabs, %l ]
   %h.fmul = fmul reassoc nnan nsz arcp contract afn float %h.fabs.phi, 2.000000e+00
   %l.1 = fmul reassoc nnan nsz arcp contract afn float %h.fabs.phi, 3.000000e+00
   br label %l
diff --git a/llvm/test/CodeGen/AMDGPU/i1-copy-phi.ll b/llvm/test/CodeGen/AMDGPU/i1-copy-phi.ll
index 80aa6ee0ab103..2c062bbd81867 100644
--- a/llvm/test/CodeGen/AMDGPU/i1-copy-phi.ll
+++ b/llvm/test/CodeGen/AMDGPU/i1-copy-phi.ll
@@ -52,7 +52,7 @@ false:
   br label %exit
 
 exit:
-  %c = phi <2 x i1> [ undef, %entry ], [ %cmp, %false ]
+  %c = phi <2 x i1> [ poison, %entry ], [ %cmp, %false ]
   %ret = select <2 x i1> %c, <2 x float> <float 2.0, float 2.0>, <2 x float> <float 4.0, float 4.0>
   ret <2 x float> %ret
 }
diff --git a/llvm/test/CodeGen/AMDGPU/implicit-def-muse.ll b/llvm/test/CodeGen/AMDGPU/implicit-def-muse.ll
index aabe4e930f708..495e8a281b05b 100644
--- a/llvm/test/CodeGen/AMDGPU/implicit-def-muse.ll
+++ b/llvm/test/CodeGen/AMDGPU/implicit-def-muse.ll
@@ -18,7 +18,7 @@ false:
   br label %exit
 
 exit:
-  %c = phi <2 x i1> [ undef, %entry ], [ %cmp, %false ]
+  %c = phi <2 x i1> [ poison, %entry ], [ %cmp, %false ]
   %ret = select <2 x i1> %c, <2 x float> <float 2.0, float 2.0>, <2 x float> <float 4.0, float 4.0>
   ret <2 x float> %ret
 }
diff --git a/llvm/test/CodeGen/AMDGPU/inline-asm.ll b/llvm/test/CodeGen/AMDGPU/inline-asm.ll
index 881433f48c76f..4a6dd870fe62d 100644
--- a/llvm/test/CodeGen/AMDGPU/inline-asm.ll
+++ b/llvm/test/CodeGen/AMDGPU/inline-asm.ll
@@ -307,7 +307,7 @@ false:
   br label %exit
 
 exit:
-  %s1 = phi { i64, i64} [ undef, %entry ], [ %s0, %false]
+  %s1 = phi { i64, i64} [ poison, %entry ], [ %s0, %false]
   %v0 = extractvalue { i64, i64 } %s1, 0
   %v1 = extractvalue { i64, i64 } %s1, 1
   tail call void asm sideeffect "; use $0", "v"(i64 %v0)
diff --git a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.ordered.swap.ll b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.ordered.swap.ll
index cee5bbbe85f48..c9f089e248e76 100644
--- a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.ordered.swap.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.ordered.swap.ll
@@ -41,7 +41,7 @@ if-true:
   br label %endif
 
 endif:
-  %v = phi i32 [ %val, %if-true ], [ undef, %entry ]
+  %v = phi i32 [ %val, %if-true ], [ poison, %entry ]
   %r = bitcast i32 %v to float
   ret float %r
 }
diff --git a/llvm/test/CodeGen/AMDGPU/madmk.ll b/llvm/test/CodeGen/AMDGPU/madmk.ll
index d5ef866dc8a85..1769b7418b232 100644
--- a/llvm/test/CodeGen/AMDGPU/madmk.ll
+++ b/llvm/test/CodeGen/AMDGPU/madmk.ll
@@ -199,7 +199,7 @@ bb1:                                              ; preds = %bb2
   ret void
 
 bb2:                                              ; preds = %bb6, %bb
-  %tmp = phi float [ undef, %bb ], [ %tmp8, %bb6 ]
+  %tmp = phi float [ poison, %bb ], [ %tmp8, %bb6 ]
   %tid = call i32 @llvm.amdgcn.mbcnt.lo(i32 -1, i32 0) #1
   %f_tid = bitcast i32 %tid to float
   %tmp3 = fsub float %f_tid, %tmp
diff --git a/llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll b/llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll
index 1d0533ca07b3e..6d4467a541203 100644
--- a/llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll
+++ b/llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll
@@ -48,7 +48,7 @@ if.then3.i:                                       ; preds = %if.end60
   br label %if.end5.i
 
 if.end5.i:                                        ; preds = %if.then3.i, %if.end60
-  %pS.addr.0.i = phi ptr addrspace(5) [ undef, %if.then3.i ], [ %runtimeVersionCopy, %if.end60 ]
+  %pS.addr.0.i = phi ptr addrspace(5) [ poison, %if.then3.i ], [ %runtimeVersionCopy, %if.end60 ]
   %2 = load i8, ptr addrspace(5) %pS.addr.0.i, align 1
   %conv612.i = sext i8 %2 to i32
   %sub13.i = add nsw i32 %conv612.i, -48
@@ -65,7 +65,7 @@ if.then3.i308:                                    ; preds = %if.end5.i
   br label %if.end5.i314
 
 if.end5.i314:                                     ; preds = %if.then3.i308, %if.end5.i
-  %pS.addr.0.i309 = phi ptr addrspace(5) [ undef, %if.then3.i308 ], [ %licenseVersionCopy, %if.end5.i ]
+  %pS.addr.0.i309 = phi ptr addrspace(5) [ poison, %if.then3.i308 ], [ %licenseVersionCopy, %if.end5.i ]
   %3 = load i8, ptr addrspace(5) %pS.addr.0.i309, align 1
   %conv612.i311 = sext i8 %3 to i32
   %sub13.i312 = add nsw i32 %conv612.i311, -48
@@ -82,7 +82,7 @@ if.then3.i332:                                    ; preds = %if.end5.i314
   br label %if.end5.i338
 
 if.end5.i338:                                     ; preds = %if.then3.i332, %if.end5.i314
-  %pS.addr.0.i333 = phi ptr addrspace(5) [ undef, %if.then3.i332 ], [ %arrayidx144260.5, %if.end5.i314 ]
+  %pS.addr.0.i333 = phi ptr addrspace(5) [ poison, %if.then3.i332 ], [ %arrayidx144260.5, %if.end5.i314 ]
   %4 = load i8, ptr addrspace(5) %pS.addr.0.i333, align 1
   %conv612.i335 = sext i8 %4 to i32
   %sub13.i336 = add nsw i32 %conv612.i335, -48
@@ -99,7 +99,7 @@ if.then3.i356:                                    ; preds = %if.end5.i338
   br label %if.end5.i362
 
 if.end5.i362:                                     ; preds = %if.then3.i356, %if.end5.i338
-  %pS.addr.0.i357 = phi ptr addrspace(5) [ undef, %if.then3.i356 ], [ %arrayidx156258.5, %if.end5.i338 ]
+  %pS.addr.0.i357 = phi ptr addrspace(5) [ poison, %if.then3.i356 ], [ %arrayidx156258.5, %if.end5.i338 ]
   %5 = load i8, ptr addrspace(5) %pS.addr.0.i357, align 1
   %conv612.i359 = sext i8 %5 to i32
   %sub13.i360 = add nsw i32 %conv612.i359, -48
@@ -120,7 +120,7 @@ if.then3.i394:                                    ; preds = %if.end5.i362
   br label %if.end5.i400
 
 if.end5.i400:                                     ; preds = %if.then3.i394, %if.end5.i362
-  %pS.addr.0.i395 = phi ptr addrspace(5) [ %arrayidx232250.1, %if.then3.i394 ], [ undef, %if.end5.i362 ]
+  %pS.addr.0.i395 = phi ptr addrspace(5) [ %arrayidx232250.1, %if.then3.i394 ], [ poison, %if.end5.i362 ]
   %7 = load i8, ptr addrspace(5) %pS.addr.0.i395, align 1
   %conv612.i397 = sext i8 %7 to i32
   %sub13.i398 = add nsw i32 %conv612.i397, -48
diff --git a/llvm/test/CodeGen/AMDGPU/move-to-valu-worklist.ll b/llvm/test/CodeGen/AMDGPU/move-to-valu-worklist.ll
index 9b7d851a0c74e..a4cb43e14c2e2 100644
--- a/llvm/test/CodeGen/AMDGPU/move-to-valu-worklist.ll
+++ b/llvm/test/CodeGen/AMDGPU/move-to-valu-worklist.ll
@@ -17,8 +17,8 @@ bb:
 br label %bb1
 
 bb1:                                 ...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/130267


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