[InstCombine] add tests for zext-of-icmp; NFC

Author: rotateright

llvm/test/Transforms/InstCombine/zext.ll

@@ -179,8 +179,8 @@ define i47 @sext_zext_apint2(i11 %A) {
 define i32 @masked_bit_set(i32 %x, i32 %y) {
 ; CHECK-LABEL: @masked_bit_set(
 ; CHECK-NEXT:    [[TMP1:%.*]] = lshr i32 [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 1
-; CHECK-NEXT:    ret i32 [[TMP2]]
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[TMP1]], 1
+; CHECK-NEXT:    ret i32 [[R]]
 ;
   %sh1 = shl i32 1, %y
   %and = and i32 %sh1, %x
@@ -193,8 +193,8 @@ define <2 x i32> @masked_bit_clear(<2 x i32> %x, <2 x i32> %y) {
 ; CHECK-LABEL: @masked_bit_clear(
 ; CHECK-NEXT:    [[TMP1:%.*]] = xor <2 x i32> [[X:%.*]], <i32 -1, i32 -1>
 ; CHECK-NEXT:    [[TMP2:%.*]] = lshr <2 x i32> [[TMP1]], [[Y:%.*]]
-; CHECK-NEXT:    [[TMP3:%.*]] = and <2 x i32> [[TMP2]], <i32 1, i32 1>
-; CHECK-NEXT:    ret <2 x i32> [[TMP3]]
+; CHECK-NEXT:    [[R:%.*]] = and <2 x i32> [[TMP2]], <i32 1, i32 1>
+; CHECK-NEXT:    ret <2 x i32> [[R]]
 ;
   %sh1 = shl <2 x i32> <i32 1, i32 1>, %y
   %and = and <2 x i32> %sh1, %x
@@ -207,8 +207,8 @@ define <2 x i32> @masked_bit_set_commute(<2 x i32> %px, <2 x i32> %y) {
 ; CHECK-LABEL: @masked_bit_set_commute(
 ; CHECK-NEXT:    [[X:%.*]] = srem <2 x i32> <i32 42, i32 3>, [[PX:%.*]]
 ; CHECK-NEXT:    [[TMP1:%.*]] = lshr <2 x i32> [[X]], [[Y:%.*]]
-; CHECK-NEXT:    [[TMP2:%.*]] = and <2 x i32> [[TMP1]], <i32 1, i32 1>
-; CHECK-NEXT:    ret <2 x i32> [[TMP2]]
+; CHECK-NEXT:    [[R:%.*]] = and <2 x i32> [[TMP1]], <i32 1, i32 1>
+; CHECK-NEXT:    ret <2 x i32> [[R]]
 ;
   %x = srem <2 x i32> <i32 42, i32 3>, %px ; thwart complexity-based canonicalization
   %sh1 = shl <2 x i32> <i32 1, i32 1>, %y
@@ -223,8 +223,8 @@ define i32 @masked_bit_clear_commute(i32 %px, i32 %y) {
 ; CHECK-NEXT:    [[X:%.*]] = srem i32 42, [[PX:%.*]]
 ; CHECK-NEXT:    [[TMP1:%.*]] = xor i32 [[X]], -1
 ; CHECK-NEXT:    [[TMP2:%.*]] = lshr i32 [[TMP1]], [[Y:%.*]]
-; CHECK-NEXT:    [[TMP3:%.*]] = and i32 [[TMP2]], 1
-; CHECK-NEXT:    ret i32 [[TMP3]]
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[TMP2]], 1
+; CHECK-NEXT:    ret i32 [[R]]
 ;
   %x = srem i32 42, %px ; thwart complexity-based canonicalization
   %sh1 = shl i32 1, %y
@@ -239,8 +239,8 @@ define i32 @masked_bit_set_use1(i32 %x, i32 %y) {
 ; CHECK-NEXT:    [[SH1:%.*]] = shl nuw i32 1, [[Y:%.*]]
 ; CHECK-NEXT:    call void @use32(i32 [[SH1]])
 ; CHECK-NEXT:    [[TMP1:%.*]] = lshr i32 [[X:%.*]], [[Y]]
-; CHECK-NEXT:    [[TMP2:%.*]] = and i32 [[TMP1]], 1
-; CHECK-NEXT:    ret i32 [[TMP2]]
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[TMP1]], 1
+; CHECK-NEXT:    ret i32 [[R]]
 ;
   %sh1 = shl i32 1, %y
   call void @use32(i32 %sh1)
@@ -294,8 +294,8 @@ define i32 @masked_bit_clear_use1(i32 %x, i32 %y) {
 ; CHECK-NEXT:    call void @use32(i32 [[SH1]])
 ; CHECK-NEXT:    [[TMP1:%.*]] = xor i32 [[X:%.*]], -1
 ; CHECK-NEXT:    [[TMP2:%.*]] = lshr i32 [[TMP1]], [[Y]]
-; CHECK-NEXT:    [[TMP3:%.*]] = and i32 [[TMP2]], 1
-; CHECK-NEXT:    ret i32 [[TMP3]]
+; CHECK-NEXT:    [[R:%.*]] = and i32 [[TMP2]], 1
+; CHECK-NEXT:    ret i32 [[R]]
 ;
   %sh1 = shl i32 1, %y
   call void @use32(i32 %sh1)
@@ -642,3 +642,50 @@ define i64 @and_trunc_extra_use1_wider_src(i65 %x, i32 %y) {
   %z = zext i32 %a to i64
   ret i64 %z
 }
+
+define i16 @zext_icmp_eq0_pow2(i32 %x) {
+; CHECK-LABEL: @zext_icmp_eq0_pow2(
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[X:%.*]] to i16
+; CHECK-NEXT:    [[TMP2:%.*]] = lshr i16 [[TMP1]], 2
+; CHECK-NEXT:    [[TMP3:%.*]] = and i16 [[TMP2]], 1
+; CHECK-NEXT:    [[Z:%.*]] = xor i16 [[TMP3]], 1
+; CHECK-NEXT:    ret i16 [[Z]]
+;
+  %m = and i32 %x, 4
+  %i = icmp eq i32 %m, 0
+  %z = zext i1 %i to i16
+  ret i16 %z
+}
+
+define i16 @zext_icmp_eq0_pow2_use1(i32 %x) {
+; CHECK-LABEL: @zext_icmp_eq0_pow2_use1(
+; CHECK-NEXT:    [[M:%.*]] = and i32 [[X:%.*]], 4
+; CHECK-NEXT:    call void @use32(i32 [[M]])
+; CHECK-NEXT:    [[M_LOBIT:%.*]] = lshr exact i32 [[M]], 2
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[M_LOBIT]] to i16
+; CHECK-NEXT:    [[Z:%.*]] = xor i16 [[TMP1]], 1
+; CHECK-NEXT:    ret i16 [[Z]]
+;
+  %m = and i32 %x, 4
+  call void @use32(i32 %m)
+  %i = icmp eq i32 %m, 0
+  %z = zext i1 %i to i16
+  ret i16 %z
+}
+
+define i16 @zext_icmp_eq0_pow2_use2(i32 %x) {
+; CHECK-LABEL: @zext_icmp_eq0_pow2_use2(
+; CHECK-NEXT:    [[M:%.*]] = and i32 [[X:%.*]], 4
+; CHECK-NEXT:    [[I:%.*]] = icmp eq i32 [[M]], 0
+; CHECK-NEXT:    call void @use1(i1 [[I]])
+; CHECK-NEXT:    [[M_LOBIT:%.*]] = lshr exact i32 [[M]], 2
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i32 [[M_LOBIT]] to i16
+; CHECK-NEXT:    [[Z:%.*]] = xor i16 [[TMP1]], 1
+; CHECK-NEXT:    ret i16 [[Z]]
+;
+  %m = and i32 %x, 4
+  %i = icmp eq i32 %m, 0
+  call void @use1(i1 %i)
+  %z = zext i1 %i to i16
+  ret i16 %z
+}