[ARM] add tests for select-of-constants; NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295459 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/ARM/select_const.ll b/test/CodeGen/ARM/select_const.ll
new file mode 100644 (file)
index 0000000..018cb5d
--- /dev/null
+++ b/test/CodeGen/ARM/select_const.ll
@@ -0,0 +1,257 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=arm-eabi-unknown-unknown | FileCheck %s
+
+; Select of constants: control flow / conditional moves can always be replaced by logic+math (but may not be worth it?).
+; Test the zeroext/signext variants of each pattern to see if that makes a difference.
+
+; select Cond, 0, 1 --> zext (!Cond)
+
+define i32 @select_0_or_1(i1 %cond) {
+; CHECK-LABEL: select_0_or_1:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #1
+; CHECK-NEXT:    bic r0, r1, r0
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 0, i32 1
+  ret i32 %sel
+}
+
+define i32 @select_0_or_1_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_0_or_1_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    eor r0, r0, #1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 0, i32 1
+  ret i32 %sel
+}
+
+define i32 @select_0_or_1_signext(i1 signext %cond) {
+; CHECK-LABEL: select_0_or_1_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #1
+; CHECK-NEXT:    bic r0, r1, r0
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 0, i32 1
+  ret i32 %sel
+}
+
+; select Cond, 1, 0 --> zext (Cond)
+
+define i32 @select_1_or_0(i1 %cond) {
+; CHECK-LABEL: select_1_or_0:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    ands r0, r0, #1
+; CHECK-NEXT:    movne r0, #1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 1, i32 0
+  ret i32 %sel
+}
+
+define i32 @select_1_or_0_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_1_or_0_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    movne r0, #1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 1, i32 0
+  ret i32 %sel
+}
+
+define i32 @select_1_or_0_signext(i1 signext %cond) {
+; CHECK-LABEL: select_1_or_0_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    ands r0, r0, #1
+; CHECK-NEXT:    movne r0, #1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 1, i32 0
+  ret i32 %sel
+}
+
+; select Cond, 0, -1 --> sext (!Cond)
+
+define i32 @select_0_or_neg1(i1 %cond) {
+; CHECK-LABEL: select_0_or_neg1:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mvn r1, #0
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    movne r1, #0
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 0, i32 -1
+  ret i32 %sel
+}
+
+define i32 @select_0_or_neg1_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_0_or_neg1_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mvn r1, #0
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    movne r1, #0
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 0, i32 -1
+  ret i32 %sel
+}
+
+define i32 @select_0_or_neg1_signext(i1 signext %cond) {
+; CHECK-LABEL: select_0_or_neg1_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mvn r1, #0
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    movne r1, #0
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 0, i32 -1
+  ret i32 %sel
+}
+
+; select Cond, -1, 0 --> sext (Cond)
+
+define i32 @select_neg1_or_0(i1 %cond) {
+; CHECK-LABEL: select_neg1_or_0:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    ands r0, r0, #1
+; CHECK-NEXT:    mvnne r0, #0
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 -1, i32 0
+  ret i32 %sel
+}
+
+define i32 @select_neg1_or_0_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_neg1_or_0_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    mvnne r0, #0
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 -1, i32 0
+  ret i32 %sel
+}
+
+define i32 @select_neg1_or_0_signext(i1 signext %cond) {
+; CHECK-LABEL: select_neg1_or_0_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    ands r0, r0, #1
+; CHECK-NEXT:    mvnne r0, #0
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 -1, i32 0
+  ret i32 %sel
+}
+
+; select Cond, C+1, C --> add (zext Cond), C
+
+define i32 @select_Cplus1_C(i1 %cond) {
+; CHECK-LABEL: select_Cplus1_C:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #41
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    movne r1, #42
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 42, i32 41
+  ret i32 %sel
+}
+
+define i32 @select_Cplus1_C_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_Cplus1_C_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #41
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    movne r1, #42
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 42, i32 41
+  ret i32 %sel
+}
+
+define i32 @select_Cplus1_C_signext(i1 signext %cond) {
+; CHECK-LABEL: select_Cplus1_C_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #41
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    movne r1, #42
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 42, i32 41
+  ret i32 %sel
+}
+
+; select Cond, C, C+1 --> add (sext Cond), C
+
+define i32 @select_C_Cplus1(i1 %cond) {
+; CHECK-LABEL: select_C_Cplus1:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #42
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    movne r1, #41
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 41, i32 42
+  ret i32 %sel
+}
+
+define i32 @select_C_Cplus1_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_C_Cplus1_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #42
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    movne r1, #41
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 41, i32 42
+  ret i32 %sel
+}
+
+define i32 @select_C_Cplus1_signext(i1 signext %cond) {
+; CHECK-LABEL: select_C_Cplus1_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #42
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    movne r1, #41
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 41, i32 42
+  ret i32 %sel
+}
+
+; In general, select of 2 constants could be:
+; select Cond, C1, C2 --> add (mul (zext Cond), C1-C2), C2 --> add (and (sext Cond), C1-C2), C2
+
+define i32 @select_C1_C2(i1 %cond) {
+; CHECK-LABEL: select_C1_C2:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #165
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    orr r1, r1, #256
+; CHECK-NEXT:    moveq r1, #42
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 421, i32 42
+  ret i32 %sel
+}
+
+define i32 @select_C1_C2_zeroext(i1 zeroext %cond) {
+; CHECK-LABEL: select_C1_C2_zeroext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #165
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    orr r1, r1, #256
+; CHECK-NEXT:    moveq r1, #42
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 421, i32 42
+  ret i32 %sel
+}
+
+define i32 @select_C1_C2_signext(i1 signext %cond) {
+; CHECK-LABEL: select_C1_C2_signext:
+; CHECK:       @ BB#0:
+; CHECK-NEXT:    mov r1, #165
+; CHECK-NEXT:    tst r0, #1
+; CHECK-NEXT:    orr r1, r1, #256
+; CHECK-NEXT:    moveq r1, #42
+; CHECK-NEXT:    mov r0, r1
+; CHECK-NEXT:    mov pc, lr
+  %sel = select i1 %cond, i32 421, i32 42
+  ret i32 %sel
+}
+