[llvm] [PowerPC] Support local-dynamic TLS relocation on AIX (PR #66316)

[Felix via llvm-commits]

================
@@ -172,10 +173,12 @@ define void @storesTIInit(double %Val) #0 {
 ; LARGE32-NEXT:    stwu 1, -32(1)
 ; LARGE32-NEXT:    stw 0, 40(1)
 ; LARGE32-NEXT:    addis 3, L..C4 at u(2)
-; LARGE32-NEXT:    addis 4, L..C5 at u(2)
 ; LARGE32-NEXT:    lwz 3, L..C4 at l(3)
-; LARGE32-NEXT:    lwz 4, L..C5 at l(4)
-; LARGE32-NEXT:    bla .__tls_get_addr[PR]
+; LARGE32-NEXT:    addis 4, L..C5 at u(2)
+; LARGE32-NEXT:    lwz 6, L..C5 at l(4)
----------------
orcguru wrote:

# *** IR Dump After PowerPC TLS Dynamic Call Fixup (ppc-tls-dynamic-call) ***:
# Machine code for function storesTIInit: IsSSA, TracksLiveness
Function Live Ins: $f1 in %0

bb.0.entry:
  liveins: $f1
  %0:f8rc = COPY $f1
  %4:g8rc_and_g8rc_nox0 = ADDIStocHA8 $x2, target-flags(ppc-tlsld) &"_$TLSML[TC]"
  %5:g8rc_and_g8rc_nox0 = LDtocL target-flags(ppc-tlsld) &"_$TLSML[TC]", %4:g8rc_and_g8rc_nox0
  $x3 = COPY %5:g8rc_and_g8rc_nox0
  $x3 = GETtlsMOD64AIX $x3, implicit-def $x0, implicit-def $x4, implicit-def $x5, implicit-def $x11, implicit-def $lr8, implicit-def $cr0
  %1:g8rc_and_g8rc_nox0 = ADDIStocHA8 $x2, target-flags(ppc-tlsld) @TIInit
  %2:g8rc = LDtocL target-flags(ppc-tlsld) @TIInit, %1:g8rc_and_g8rc_nox0 :: (load (s64) from got)
  ADJCALLSTACKDOWN 0, 0, implicit-def $r1, implicit $r1
  $x4 = COPY %2:g8rc
  $x3 = ADD8 $x3, $x4
  ADJCALLSTACKUP 0, 0, implicit-def $r1, implicit $r1
  %3:g8rc_and_g8rc_nox0 = COPY $x3
  STFD %0:f8rc, 0, %3:g8rc_and_g8rc_nox0 :: (store (s64) into @TIInit)
  BLR8 implicit $lr8, implicit $rm

# End machine code for function storesTIInit.


# *** IR Dump After Machine Instruction Scheduler (machine-scheduler) ***:
# Machine code for function storesTIInit: NoPHIs, TracksLiveness, TiedOpsRewritten
Function Live Ins: $f1 in %0

0B      bb.0.entry:
          liveins: $f1
16B       %0:f8rc = COPY $f1
32B       %4:g8rc_and_g8rc_nox0 = ADDIStocHA8 $x2, target-flags(ppc-tlsld) &"_$TLSML[TC]"
48B       %5:g8rc_and_g8rc_nox0 = LDtocL target-flags(ppc-tlsld) &"_$TLSML[TC]", %4:g8rc_and_g8rc_nox0, implicit $x2
96B       %1:g8rc_and_g8rc_nox0 = ADDIStocHA8 $x2, target-flags(ppc-tlsld) @TIInit
100B      $x3 = COPY %5:g8rc_and_g8rc_nox0
104B      $x3 = GETtlsMOD64AIX $x3, implicit-def dead $x0, implicit-def dead $x4, implicit-def dead $x5, implicit-def dead $x11, implicit-def $lr8, implicit-def dead $cr0
112B      %2:g8rc = LDtocL target-flags(ppc-tlsld) @TIInit, %1:g8rc_and_g8rc_nox0, implicit $x2 :: (load (s64) from got)
128B      ADJCALLSTACKDOWN 0, 0, implicit-def $r1, implicit $r1
144B      $x4 = COPY %2:g8rc
160B      $x3 = ADD8 $x3, $x4
176B      ADJCALLSTACKUP 0, 0, implicit-def $r1, implicit $r1
192B      %3:g8rc_and_g8rc_nox0 = COPY $x3
208B      STFD %0:f8rc, 0, %3:g8rc_and_g8rc_nox0 :: (store (s64) into @TIInit)
224B      BLR8 implicit $lr8, implicit $rm

# End machine code for function storesTIInit.


https://github.com/llvm/llvm-project/pull/66316