Add some peepholes for signed comparisons using ashr X, X, 32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83549 91177308-0d34-0410-b5e6-96231b3b80d8
2026-04-25 05:22:04 +00:00 · 2009-10-08 15:38:17 +00:00
parent 80ed255843
commit c96c8e0e81
2 changed files with 92 additions and 0 deletions
@@ -0,0 +1,76 @@
+; RUN: llc < %s -march=xcore | FileCheck %s
+define i32 @ashr(i32 %a, i32 %b) {
+	%1 = ashr i32 %a, %b
+	ret i32 %1
+}
+; CHECK: ashr:
+; CHECK-NEXT: ashr r0, r0, r1
+
+define i32 @ashri1(i32 %a) {
+	%1 = ashr i32 %a, 24
+	ret i32 %1
+}
+; CHECK: ashri1:
+; CHECK-NEXT: ashr r0, r0, 24
+
+define i32 @ashri2(i32 %a) {
+	%1 = ashr i32 %a, 31
+	ret i32 %1
+}
+; CHECK: ashri2:
+; CHECK-NEXT: ashr r0, r0, 32
+
+define i32 @f1(i32 %a) {
+        %1 = icmp slt i32 %a, 0
+	br i1 %1, label %less, label %not_less
+less:
+	ret i32 10
+not_less:
+	ret i32 17
+}
+; CHECK: f1:
+; CHECK-NEXT: ashr r0, r0, 32
+; CHECK-NEXT: bf r0
+
+define i32 @f2(i32 %a) {
+        %1 = icmp sge i32 %a, 0
+	br i1 %1, label %greater, label %not_greater
+greater:
+	ret i32 10
+not_greater:
+	ret i32 17
+}
+; CHECK: f2:
+; CHECK-NEXT: ashr r0, r0, 32
+; CHECK-NEXT: bt r0
+
+define i32 @f3(i32 %a) {
+        %1 = icmp slt i32 %a, 0
+	%2 = select i1 %1, i32 10, i32 17
+	ret i32 %2
+}
+; CHECK: f3:
+; CHECK-NEXT: ashr r1, r0, 32
+; CHECK-NEXT: ldc r0, 10
+; CHECK-NEXT: bt r1
+; CHECK: ldc r0, 17
+
+define i32 @f4(i32 %a) {
+        %1 = icmp sge i32 %a, 0
+	%2 = select i1 %1, i32 10, i32 17
+	ret i32 %2
+}
+; CHECK: f4:
+; CHECK-NEXT: ashr r1, r0, 32
+; CHECK-NEXT: ldc r0, 17
+; CHECK-NEXT: bt r1
+; CHECK: ldc r0, 10
+
+define i32 @f5(i32 %a) {
+        %1 = icmp sge i32 %a, 0
+	%2 = zext i1 %1 to i32
+	ret i32 %2
+}
+; CHECK: f5:
+; CHECK-NEXT: ashr r0, r0, 32
+; CHECK-NEXT: eq r0, r0, 0