[ARM] GlobalISel: Lower calls to void() functions

For now, we hardcode a BLX instruction, and generate an ADJCALLSTACKDOWN/UP pair
with amount 0.

llvm-svn: 295716

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll b/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
index ead9950ecac..28bbda4dc8e 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
@@ -335,3 +335,26 @@ entry:
   %v = fadd double %p0, %p1
   ret double %v
 }
+
+define arm_aapcscc void @test_indirect_call(void() *%fptr) {
+; CHECK-LABEL: name: test_indirect_call
+; CHECK: [[FPTR:%[0-9]+]](p0) = COPY %r0
+; CHECK: ADJCALLSTACKDOWN 0, 14, _, implicit-def %sp, implicit %sp
+; CHECK: BLX [[FPTR]](p0), csr_aapcs, implicit-def %lr, implicit %sp
+; CHECK: ADJCALLSTACKUP 0, 0, 14, _, implicit-def %sp, implicit %sp
+entry:
+  notail call arm_aapcscc void %fptr()
+  ret void
+}
+
+declare arm_aapcscc void @call_target()
+
+define arm_aapcscc void @test_direct_call() {
+; CHECK-LABEL: name: test_direct_call
+; CHECK: ADJCALLSTACKDOWN 0, 14, _, implicit-def %sp, implicit %sp
+; CHECK: BLX @call_target, csr_aapcs, implicit-def %lr, implicit %sp
+; CHECK: ADJCALLSTACKUP 0, 0, 14, _, implicit-def %sp, implicit %sp
+entry:
+  notail call arm_aapcscc void @call_target()
+  ret void
+}