[x86] add more tests for select --> sbb transform; NFC

These are siblings of the tests added with r306032.

llvm-svn: 306064

1 files changed, 61 insertions, 4 deletions

diff --git a/llvm/test/CodeGen/X86/sbb.ll b/llvm/test/CodeGen/X86/sbb.ll
index 062c5d26247..61f639a7a95 100644
--- a/llvm/test/CodeGen/X86/sbb.ll
+++ b/llvm/test/CodeGen/X86/sbb.ll
@@ -30,7 +30,7 @@ define i16 @i16_select_0_or_neg1_as_math(i16 %x) {
   ret i16 %add
 }
 
-; (X !== 0) ? -1 : 0 --> 0 - (X != 0)
+; (X != 0) ? -1 : 0 --> 0 - (X != 0)
 
 define i32 @i32_select_0_or_neg1_commuted(i32 %x) {
 ; CHECK-LABEL: i32_select_0_or_neg1_commuted:
@@ -43,7 +43,7 @@ define i32 @i32_select_0_or_neg1_commuted(i32 %x) {
   ret i32 %sel
 }
 
-; (X !== 0) ? -1 : 0 --> 0 - (X != 0)
+; (X != 0) ? -1 : 0 --> 0 - (X != 0)
 
 define i64 @i64_select_0_or_neg1_commuted_as_math(i64 %x) {
 ; CHECK-LABEL: i64_select_0_or_neg1_commuted_as_math:
@@ -53,7 +53,64 @@ define i64 @i64_select_0_or_neg1_commuted_as_math(i64 %x) {
 ; CHECK-NEXT:    retq
   %cmp = icmp ne i64 %x, 0
   %ext = zext i1 %cmp to i64
-  %add = sub i64 0, %ext
-  ret i64 %add
+  %sub = sub i64 0, %ext
+  ret i64 %sub
+}
+
+; (X == 0) ? -1 : 0 --> 0 - (X == 0)
+
+define i64 @i64_select_neg1_or_0(i64 %x) {
+; CHECK-LABEL: i64_select_neg1_or_0:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    cmpq $1, %rdi
+; CHECK-NEXT:    sbbq %rax, %rax
+; CHECK-NEXT:    retq
+  %cmp = icmp eq i64 %x, 0
+  %sel = select i1 %cmp, i64 -1, i64 0
+  ret i64 %sel
+}
+
+; (X == 0) ? -1 : 0 --> 0 - (X == 0)
+
+define i32 @i32_select_neg1_or_0_as_math(i32 %x) {
+; CHECK-LABEL: i32_select_neg1_or_0_as_math:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    xorl %eax, %eax
+; CHECK-NEXT:    cmpl $1, %edi
+; CHECK-NEXT:    sbbl $0, %eax
+; CHECK-NEXT:    retq
+  %cmp = icmp eq i32 %x, 0
+  %ext = zext i1 %cmp to i32
+  %sub = sub i32 0, %ext
+  ret i32 %sub
+}
+
+; (X != 0) ? 0 : -1 --> (X != 0) - 1
+
+define i16 @i16_select_neg1_or_0_commuted(i16 %x) {
+; CHECK-LABEL: i16_select_neg1_or_0_commuted:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    cmpw $1, %di
+; CHECK-NEXT:    movw $-1, %ax
+; CHECK-NEXT:    sbbw $-1, %ax
+; CHECK-NEXT:    retq
+  %cmp = icmp ne i16 %x, 0
+  %sel = select i1 %cmp, i16 0, i16 -1
+  ret i16 %sel
+}
+
+; (X != 0) ? 0 : -1 --> (X != 0) - 1
+
+define i8 @i8_select_neg1_or_0_commuted_as_math(i8 %x) {
+; CHECK-LABEL: i8_select_neg1_or_0_commuted_as_math:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    cmpb $1, %dil
+; CHECK-NEXT:    movb $-1, %al
+; CHECK-NEXT:    sbbb $-1, %al
+; CHECK-NEXT:    retq
+  %cmp = icmp ne i8 %x, 0
+  %ext = zext i1 %cmp to i8
+  %add = add i8 %ext, -1
+  ret i8 %add
 }