[InstCombine] Add a new formula for SMIN.

[oota-llvm.git] / test / Transforms / InstCombine / overflow.ll

diff --git a/test/Transforms/InstCombine/overflow.ll b/test/Transforms/InstCombine/overflow.ll
index f3f8ca3d61d678c4093add682094237d813665ab..4c0a8a2c0df7d7c49a305a09a8e874a710344154 100644 (file)
--- a/test/Transforms/InstCombine/overflow.ll
+++ b/test/Transforms/InstCombine/overflow.ll
@@ -1,7 +1,9 @@
 ; RUN: opt -S -instcombine < %s | FileCheck %s
 ; <rdar://problem/8558713>
 
-; CHECK: @test1
+declare void @throwAnExceptionOrWhatever()
+
+; CHECK-LABEL: @test1(
 define i32 @test1(i32 %a, i32 %b) nounwind ssp {
 entry:
 ; CHECK-NOT: sext
@@ -9,12 +11,12 @@ entry:
   %conv2 = sext i32 %b to i64
   %add = add nsw i64 %conv2, %conv
   %add.off = add i64 %add, 2147483648
-; CHECK: llvm.sadd.with.overflow
+; CHECK: llvm.sadd.with.overflow.i32
   %0 = icmp ugt i64 %add.off, 4294967295
   br i1 %0, label %if.then, label %if.end
 
 if.then:
-  %call = tail call i32 (...)* @throwAnExceptionOrWhatever() nounwind
+  tail call void @throwAnExceptionOrWhatever() nounwind
   br label %if.end
 
 if.end:
@@ -24,4 +26,97 @@ if.end:
   ret i32 %conv9
 }
 
-declare i32 @throwAnExceptionOrWhatever(...)
+; CHECK-LABEL: @test2(
+; This form should not be promoted for two reasons: 1) it is unprofitable to
+; promote it since the add.off instruction has another use, and 2) it is unsafe
+; because the add-with-off makes the high bits of the original add live.
+define i32 @test2(i32 %a, i32 %b, i64* %P) nounwind ssp {
+entry:
+  %conv = sext i32 %a to i64
+  %conv2 = sext i32 %b to i64
+  %add = add nsw i64 %conv2, %conv
+  %add.off = add i64 %add, 2147483648
+  
+  store i64 %add.off, i64* %P
+  
+; CHECK-NOT: llvm.sadd.with.overflow
+  %0 = icmp ugt i64 %add.off, 4294967295
+  br i1 %0, label %if.then, label %if.end
+
+if.then:
+  tail call void @throwAnExceptionOrWhatever() nounwind
+  br label %if.end
+
+if.end:
+  %conv9 = trunc i64 %add to i32
+; CHECK: ret i32
+  ret i32 %conv9
+}
+
+; CHECK: test3
+; PR8816
+; This is illegal to transform because the high bits of the original add are
+; live out.
+define i64 @test3(i32 %a, i32 %b) nounwind ssp {
+entry:
+  %conv = sext i32 %a to i64
+  %conv2 = sext i32 %b to i64
+  %add = add nsw i64 %conv2, %conv
+  %add.off = add i64 %add, 2147483648
+; CHECK-NOT: llvm.sadd.with.overflow
+  %0 = icmp ugt i64 %add.off, 4294967295
+  br i1 %0, label %if.then, label %if.end
+
+if.then:
+  tail call void @throwAnExceptionOrWhatever() nounwind
+  br label %if.end
+
+if.end:
+  ret i64 %add
+; CHECK: ret i64
+}
+
+; CHECK-LABEL: @test4(
+; Should be able to form an i8 sadd computed in an i32.
+define zeroext i8 @test4(i8 signext %a, i8 signext %b) nounwind ssp {
+entry:
+  %conv = sext i8 %a to i32
+  %conv2 = sext i8 %b to i32
+  %add = add nsw i32 %conv2, %conv
+  %add4 = add nsw i32 %add, 128
+  %cmp = icmp ugt i32 %add4, 255
+  br i1 %cmp, label %if.then, label %if.end
+; CHECK: llvm.sadd.with.overflow.i8
+if.then:                                          ; preds = %entry
+  tail call void @throwAnExceptionOrWhatever() nounwind
+  unreachable
+
+if.end:                                           ; preds = %entry
+  %conv7 = trunc i32 %add to i8
+  ret i8 %conv7
+; CHECK: ret i8
+}
+
+; CHECK-LABEL: @test8(
+; PR11438
+; This is @test1, but the operands are not sign-extended.  Make sure
+; we don't transform this case.
+define i32 @test8(i64 %a, i64 %b) nounwind ssp {
+entry:
+; CHECK-NOT: llvm.sadd
+; CHECK: add i64 %a, %b
+; CHECK-NOT: llvm.sadd
+; CHECK: ret
+  %add = add i64 %a, %b
+  %add.off = add i64 %add, 2147483648
+  %0 = icmp ugt i64 %add.off, 4294967295
+  br i1 %0, label %if.then, label %if.end
+
+if.then:
+  tail call void @throwAnExceptionOrWhatever() nounwind
+  br label %if.end
+
+if.end:
+  %conv9 = trunc i64 %add to i32
+  ret i32 %conv9
+}