Subzero ARM: do lowerIcmp, lowerBr, and a bit of lowerCall.

tests_lit/llvm2ice_tests/branch-opt.ll

Index: tests_lit/llvm2ice_tests/branch-opt.ll
diff --git a/tests_lit/llvm2ice_tests/branch-opt.ll b/tests_lit/llvm2ice_tests/branch-opt.ll
index 41e05213568cd2fc82ab18b4dc41f512f0325615..eecd70fddaf0445d6d45b5ea734dc68b2bc1f111 100644
--- a/tests_lit/llvm2ice_tests/branch-opt.ll
+++ b/tests_lit/llvm2ice_tests/branch-opt.ll
@@ -1,10 +1,21 @@
 ; Tests the branch optimizations under O2 (against a lack of
 ; optimizations under Om1).
 
-; RUN: %p2i --filetype=obj --disassemble -i %s --args -O2 \
-; RUN:   | FileCheck --check-prefix=O2 %s
-; RUN: %p2i --filetype=obj --disassemble -i %s --args -Om1 \
-; RUN:   | FileCheck --check-prefix=OM1 %s
+; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
+; RUN:   --target x8632 -i %s --args -O2 \
+; RUN:   | %if --need=target_X8632 --command FileCheck --check-prefix=O2 %s
+
+; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
+; RUN:   --target x8632 -i %s --args -Om1 \
+; RUN:   | %if --need=target_X8632 --command FileCheck --check-prefix=OM1 %s
+
+; TODO(jvoung): Stop skipping unimplemented parts (via --skip-unimplemented)
+; once enough infrastructure is in. Also, switch to --filetype=obj
+; when possible.
+; Also test Om1 when addProlog is done.
+; RUN: %if --need=target_ARM32 --command %p2i --filetype=asm --assemble \
+; RUN:   --disassemble --target arm32 -i %s --args -O2 --skip-unimplemented \
+; RUN:   | %if --need=target_ARM32 --command FileCheck --check-prefix ARM32O2 %s
 
 declare void @dummy()
 
@@ -29,6 +40,10 @@ next:
 ; OM1-NEXT: jmp
 ; OM1: call
 
+; ARM32O2-LABEL: testUncondToNextBlock
+; ARM32O2: bl {{.*}} dummy
+; ARM32O2-NEXT: bl {{.*}} dummy
+
 ; For a conditional branch with a fallthrough to the next block, the
 ; fallthrough branch should be removed.
 define void @testCondFallthroughToNextBlock(i32 %arg) {
@@ -62,6 +77,17 @@ target:
 ; OM1: call
 ; OM1: ret
 
+; Note that compare and branch folding isn't implemented yet (unlike x86-32).
+; ARM32O2-LABEL: testCondFallthroughToNextBlock
+; ARM32O2: cmp {{.*}}, #123
+; ARM32O2-NEXT: movge {{.*}}, #1
+; ARM32O2-NEXT: cmp {{.*}}, #0
+; ARM32O2-NEXT: bne
+; ARM32O2-NEXT: bl
+; ARM32O2-NEXT: bx lr
+; ARM32O2-NEXT: bl
+; ARM32O2-NEXT: bx lr
+
 ; For a conditional branch with the next block as the target and a
 ; different block as the fallthrough, the branch condition should be
 ; inverted, the fallthrough block changed to the target, and the
@@ -96,3 +122,15 @@ target:
 ; OM1: ret
 ; OM1: call
 ; OM1: ret
+
+; Note that compare and branch folding isn't implemented yet
+; (compared to x86-32).
+; ARM32O2-LABEL: testCondTargetNextBlock
+; ARM32O2: cmp {{.*}}, #123
+; ARM32O2-NEXT: movge {{.*}}, #1
+; ARM32O2-NEXT: cmp {{.*}}, #0
+; ARM32O2-NEXT: beq
+; ARM32O2-NEXT: bl
+; ARM32O2-NEXT: bx lr
+; ARM32O2-NEXT: bl
+; ARM32O2-NEXT: bx lr