[PowerPC] Precommit test to show codegen while isel is unavailable. NFC.

Author: Kai Luo

llvm/test/CodeGen/PowerPC/select-cc-no-isel.ll

@@ -0,0 +1,46 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -verify-machineinstrs -simplify-mir -mtriple=powerpc64-ibm-aix \
+; RUN:   -mcpu=pwr7 -stop-after=finalize-isel %s -o - | FileCheck %s
+; RUN: llc -verify-machineinstrs -simplify-mir -mtriple=powerpc-ibm-aix \
+; RUN:   -mcpu=pwr7 -stop-after=finalize-isel %s -o - | FileCheck --check-prefix=CHECK-32 %s
+
+define signext i32 @foo(ptr nocapture noundef %dummy) #0 {
+  ; CHECK-LABEL: name: foo
+  ; CHECK: bb.0.entry:
+  ; CHECK-NEXT:   liveins: $x3
+  ; CHECK-NEXT: {{  $}}
+  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:g8rc_and_g8rc_nox0 = COPY $x3
+  ; CHECK-NEXT:   [[LWZ:%[0-9]+]]:gprc_and_gprc_nor0 = LWZ 0, [[COPY]] :: (load (s32) from %ir.dummy)
+  ; CHECK-NEXT:   [[ADDI:%[0-9]+]]:gprc_and_gprc_nor0 = nsw ADDI [[LWZ]], 1
+  ; CHECK-NEXT:   [[CMPWI:%[0-9]+]]:crrc = CMPWI [[LWZ]], 750
+  ; CHECK-NEXT:   [[LI:%[0-9]+]]:gprc_and_gprc_nor0 = LI 1
+  ; CHECK-NEXT:   [[ISEL:%[0-9]+]]:gprc = ISEL [[ADDI]], [[LI]], [[CMPWI]].sub_lt
+  ; CHECK-NEXT:   STW killed [[ISEL]], 0, [[COPY]] :: (store (s32) into %ir.dummy)
+  ; CHECK-NEXT:   [[LI8_:%[0-9]+]]:g8rc = LI8 0
+  ; CHECK-NEXT:   $x3 = COPY [[LI8_]]
+  ; CHECK-NEXT:   BLR8 implicit $lr8, implicit $rm, implicit $x3
+  ;
+  ; CHECK-32-LABEL: name: foo
+  ; CHECK-32: bb.0.entry:
+  ; CHECK-32-NEXT:   liveins: $r3
+  ; CHECK-32-NEXT: {{  $}}
+  ; CHECK-32-NEXT:   [[COPY:%[0-9]+]]:gprc_and_gprc_nor0 = COPY $r3
+  ; CHECK-32-NEXT:   [[LWZ:%[0-9]+]]:gprc_and_gprc_nor0 = LWZ 0, [[COPY]] :: (load (s32) from %ir.dummy)
+  ; CHECK-32-NEXT:   [[ADDI:%[0-9]+]]:gprc_and_gprc_nor0 = nsw ADDI [[LWZ]], 1
+  ; CHECK-32-NEXT:   [[CMPWI:%[0-9]+]]:crrc = CMPWI [[LWZ]], 750
+  ; CHECK-32-NEXT:   [[LI:%[0-9]+]]:gprc_and_gprc_nor0 = LI 1
+  ; CHECK-32-NEXT:   [[ISEL:%[0-9]+]]:gprc = ISEL [[ADDI]], [[LI]], [[CMPWI]].sub_lt
+  ; CHECK-32-NEXT:   STW killed [[ISEL]], 0, [[COPY]] :: (store (s32) into %ir.dummy)
+  ; CHECK-32-NEXT:   [[LI1:%[0-9]+]]:gprc = LI 0
+  ; CHECK-32-NEXT:   $r3 = COPY [[LI1]]
+  ; CHECK-32-NEXT:   BLR implicit $lr, implicit $rm, implicit $r3
+entry:
+  %0 = load i32, ptr %dummy, align 4
+  %cmp = icmp slt i32 %0, 750
+  %inc = add nsw i32 %0, 1
+  %storemerge = select i1 %cmp, i32 %inc, i32 1
+  store i32 %storemerge, ptr %dummy, align 4
+  ret i32 0
+}
+
+attributes #0 = { "target-features"="-isel" }