[llvm] r266243 - [x86] add tests to show potential BMI optimization
Sanjay Patel via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 13 13:40:44 PDT 2016
Author: spatel
Date: Wed Apr 13 15:40:43 2016
New Revision: 266243
URL: http://llvm.org/viewvc/llvm-project?rev=266243&view=rev
Log:
[x86] add tests to show potential BMI optimization
Modified:
llvm/trunk/test/CodeGen/X86/bmi.ll
Modified: llvm/trunk/test/CodeGen/X86/bmi.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/bmi.ll?rev=266243&r1=266242&r2=266243&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/bmi.ll (original)
+++ llvm/trunk/test/CodeGen/X86/bmi.ll Wed Apr 13 15:40:43 2016
@@ -150,6 +150,74 @@ define i1 @andn_cmp(i32 %x, i32 %y) {
ret i1 %cmp
}
+; TODO: Recognize a disguised andn in the following 4 tests.
+define i1 @and_cmp1(i32 %x, i32 %y) {
+; CHECK-LABEL: and_cmp1:
+; CHECK: # BB#0:
+; CHECK-NEXT: andl %esi, %edi
+; CHECK-NEXT: cmpl %esi, %edi
+; CHECK-NEXT: sete %al
+; CHECK-NEXT: retq
+;
+ %and = and i32 %x, %y
+ %cmp = icmp eq i32 %and, %y
+ ret i1 %cmp
+}
+
+define i1 @and_cmp2(i32 %x, i32 %y) {
+; CHECK-LABEL: and_cmp2:
+; CHECK: # BB#0:
+; CHECK-NEXT: andl %esi, %edi
+; CHECK-NEXT: cmpl %esi, %edi
+; CHECK-NEXT: setne %al
+; CHECK-NEXT: retq
+;
+ %and = and i32 %y, %x
+ %cmp = icmp ne i32 %and, %y
+ ret i1 %cmp
+}
+
+define i1 @and_cmp3(i32 %x, i32 %y) {
+; CHECK-LABEL: and_cmp3:
+; CHECK: # BB#0:
+; CHECK-NEXT: andl %esi, %edi
+; CHECK-NEXT: cmpl %edi, %esi
+; CHECK-NEXT: sete %al
+; CHECK-NEXT: retq
+;
+ %and = and i32 %x, %y
+ %cmp = icmp eq i32 %y, %and
+ ret i1 %cmp
+}
+
+define i1 @and_cmp4(i32 %x, i32 %y) {
+; CHECK-LABEL: and_cmp4:
+; CHECK: # BB#0:
+; CHECK-NEXT: andl %esi, %edi
+; CHECK-NEXT: cmpl %edi, %esi
+; CHECK-NEXT: setne %al
+; CHECK-NEXT: retq
+;
+ %and = and i32 %y, %x
+ %cmp = icmp ne i32 %y, %and
+ ret i1 %cmp
+}
+
+; A mask and compare against constant is ok for an 'andn' too
+; even though the BMI instruction doesn't have an immediate form.
+define i1 @and_cmp_const(i32 %x) {
+; CHECK-LABEL: and_cmp_const:
+; CHECK: # BB#0:
+; CHECK-NEXT: andl $43, %edi
+; CHECK-NEXT: cmpl $43, %edi
+; CHECK-NEXT: sete %al
+; CHECK-NEXT: retq
+;
+ %and = and i32 %x, 43
+ %cmp = icmp eq i32 %and, 43
+ ret i1 %cmp
+}
+
; Don't choose a 'test' if an 'andn' can be used.
define i1 @andn_cmp_swap_ops(i64 %x, i64 %y) {
; CHECK-LABEL: andn_cmp_swap_ops:
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