[llvm] [llvm][CodeGen] Fix failure in window scheduler caused by phi (PR #95900)

[Hua Tian via llvm-commits]

=?utf-8?b?4oCcYWtpcmF0aWFu4oCd?= <akiratian at tencent.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/95900 at github.com>


================
@@ -0,0 +1,44 @@
+# REQUIRES: asserts
+# RUN: llc --march=hexagon %s -run-pass=pipeliner -debug-only=pipeliner \
+# RUN: -window-sched=force -filetype=null 2>&1 | FileCheck %s
+
+# CHECK: Special phi structure is not supported!
+# CHECK-LABEL: body:             |
+# CHECK: bb.0:
+# CHECK: [[REG:%[0-9]+]]:intregs = A2_tfrsi 0
+# CHECK: bb.2:
+# CHECK: {{%[0-9]+}}:intregs = PHI {{%[0-9]+}}, %bb.0, [[REG]], %bb.2
+
+---
+name:            poll_for_response
+tracksRegLiveness: true
+body:             |
+  bb.0:
+    successors: %bb.2(0x80000000)
+    liveins: $r0, $r1
+  
+    %0:intregs = COPY $r1
+    %1:intregs = COPY $r0
+    %2:intregs = A2_tfrsi 0
+    J2_loop0i %bb.2, 2, implicit-def $lc0, implicit-def $sa0, implicit-def $usr
+    J2_jump %bb.2, implicit-def dead $pc
+  
+  bb.1:
+    PS_jmpret $r31, implicit-def dead $pc
+  
+  bb.2:
+    successors: %bb.1(0x04000000), %bb.2(0x7c000000)
+  
+    %3:intregs = PHI %1, %bb.0, %2, %bb.2
+    %4:intregs = PHI %2, %bb.0, %5, %bb.2
+    %6:intregs = S2_lsr_i_r %3, 1
+    S2_storerb_io %0, 0, killed %6
+    S4_storerb_rr %0, %4, 0, %2
+    %5:intregs = A2_tfrsi 1
+    ENDLOOP0 %bb.2, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
+    J2_jump %bb.1, implicit-def $pc
+
+...
+
+
+
----------------
huaatian wrote:

Updated

https://github.com/llvm/llvm-project/pull/95900