[ARM] GlobalISel: Support i1 add and ABI extensions

Add support for:
* i1 add
* i1 function arguments, if passed through registers
* i1 returns, with ABI signext/zeroext

Differential Revision: https://reviews.llvm.org/D27706

llvm-svn: 293035

4 files changed, 113 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-instruction-select.mir b/llvm/test/CodeGen/ARM/GlobalISel/arm-instruction-select.mir
index 6407b9ac780..1d1a3e69b81 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-instruction-select.mir
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-instruction-select.mir
@@ -1,5 +1,7 @@
 # RUN: llc -O0 -mtriple arm-- -global-isel -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s
 --- |
+  define void @test_zext_s1() { ret void }
+  define void @test_sext_s1() { ret void }
   define void @test_sext_s8() { ret void }
   define void @test_zext_s16() { ret void }
 
@@ -10,6 +12,59 @@
   define void @test_load_from_stack() { ret void }
 ...
 ---
+name:            test_zext_s1
+# CHECK-LABEL: name: test_zext_s1
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK: selected: true
+registers:
+  - { id: 0, class: gprb }
+  - { id: 1, class: gprb }
+body:             |
+  bb.0:
+    liveins: %r0
+
+    %0(s1) = COPY %r0
+    ; CHECK: [[VREGX:%[0-9]+]] = COPY %r0
+
+    %1(s32) = G_ZEXT %0(s1)
+    ; CHECK: [[VREGEXT:%[0-9]+]] = ANDri [[VREGX]], 1, 14, _, _
+
+    %r0 = COPY %1(s32)
+    ; CHECK: %r0 = COPY [[VREGEXT]]
+
+    BX_RET 14, _, implicit %r0
+    ; CHECK: BX_RET 14, _, implicit %r0
+...
+---
+name:            test_sext_s1
+# CHECK-LABEL: name: test_sext_s1
+legalized:       true
+regBankSelected: true
+selected:        false
+# CHECK: selected: true
+registers:
+  - { id: 0, class: gprb }
+  - { id: 1, class: gprb }
+  - { id: 2, class: gprb }
+body:             |
+  bb.0:
+    liveins: %r0
+
+    %0(s1) = COPY %r0
+    ; CHECK: [[VREGX:%[0-9]+]] = COPY %r0
+
+    %1(s32) = G_SEXT %0(s1)
+    ; CHECK: [[VREGAND:%[0-9]+]] = ANDri [[VREGX]], 1, 14, _, _
+    ; CHECK: [[VREGEXT:%[0-9]+]] = RSBri [[VREGAND]], 0, 14, _, _
+
+    %r0 = COPY %1(s32)
+    ; CHECK: %r0 = COPY [[VREGEXT]]
+
+    BX_RET 14, _, implicit %r0
+    ; CHECK: BX_RET 14, _, implicit %r0
+...
 ---
 name:            test_sext_s8
 # CHECK-LABEL: name: test_sext_s8
diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll b/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
index 425544f8427..e01d89cdf7a 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-irtranslator.ll
@@ -7,6 +7,20 @@ entry:
   ret void
 }
 
+define signext i1 @test_add_i1(i1 %x, i1 %y) {
+; CHECK-LABEL: name: test_add_i1
+; CHECK: liveins: %r0, %r1
+; CHECK-DAG: [[VREGX:%[0-9]+]](s1) = COPY %r0
+; CHECK-DAG: [[VREGY:%[0-9]+]](s1) = COPY %r1
+; CHECK: [[SUM:%[0-9]+]](s1) = G_ADD [[VREGX]], [[VREGY]]
+; CHECK: [[EXT:%[0-9]+]](s32) = G_SEXT [[SUM]]
+; CHECK: %r0 = COPY [[EXT]](s32)
+; CHECK: BX_RET 14, _, implicit %r0
+entry:
+  %sum = add i1 %x, %y
+  ret i1 %sum
+}
+
 define i8 @test_add_i8(i8 %x, i8 %y) {
 ; CHECK-LABEL: name: test_add_i8
 ; CHECK: liveins: %r0, %r1
diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll b/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll
index 2c0c17c7eec..ba2a5469f85 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-isel.ll
@@ -7,6 +7,23 @@ entry:
   ret void
 }
 
+define zeroext i1 @test_zext_i1(i1 %x) {
+; CHECK-LABEL: test_zext_i1
+; CHECK: and r0, r0, #1
+; CHECK: bx lr
+entry:
+  ret i1 %x
+}
+
+define signext i1 @test_sext_i1(i1 %x) {
+; CHECK-LABEL: test_sext_i1
+; CHECK: and r0, r0, #1
+; CHECK: rsb r0, r0, #0
+; CHECK: bx lr
+entry:
+  ret i1 %x
+}
+
 define zeroext i8 @test_ext_i8(i8 %x) {
 ; CHECK-LABEL: test_ext_i8:
 ; CHECK: uxtb r0, r0
diff --git a/llvm/test/CodeGen/ARM/GlobalISel/arm-regbankselect.mir b/llvm/test/CodeGen/ARM/GlobalISel/arm-regbankselect.mir
index ce0601021e6..64c65a41a31 100644
--- a/llvm/test/CodeGen/ARM/GlobalISel/arm-regbankselect.mir
+++ b/llvm/test/CodeGen/ARM/GlobalISel/arm-regbankselect.mir
@@ -3,6 +3,7 @@
   define void @test_add_s32() { ret void }
   define void @test_add_s16() { ret void }
   define void @test_add_s8() { ret void }
+  define void @test_add_s1() { ret void }
 ...
 ---
 name:            test_add_s32
@@ -82,3 +83,29 @@ body:             |
     BX_RET 14, _, implicit %r0
 
 ...
+---
+name:            test_add_s1
+# CHECK-LABEL: name: test_add_s1
+legalized:       true
+regBankSelected: false
+selected:        false
+# CHECK: registers:
+# CHECK: - { id: 0, class: gprb }
+# CHECK: - { id: 1, class: gprb }
+# CHECK: - { id: 2, class: gprb }
+
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.0:
+    liveins: %r0, %r1
+
+    %0(s1) = COPY %r0
+    %1(s1) = COPY %r1
+    %2(s1) = G_ADD %0, %1
+    %r0 = COPY %2(s1)
+    BX_RET 14, _, implicit %r0
+
+...