Revert "Temporarily Revert "Add basic loop fusion pass.""

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552

1 files changed, 173 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/overflow.ll b/llvm/test/Transforms/InstCombine/overflow.ll
new file mode 100644
index 00000000000..f5558890d13
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/overflow.ll
@@ -0,0 +1,173 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -instcombine < %s | FileCheck %s
+; <rdar://problem/8558713>
+
+declare void @throwAnExceptionOrWhatever()
+
+define i32 @test1(i32 %a, i32 %b) nounwind ssp {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[SADD:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[B:%.*]], i32 [[A:%.*]])
+; CHECK-NEXT:    [[SADD_RESULT:%.*]] = extractvalue { i32, i1 } [[SADD]], 0
+; CHECK-NEXT:    [[TMP0:%.*]] = extractvalue { i32, i1 } [[SADD]], 1
+; CHECK-NEXT:    br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @throwAnExceptionOrWhatever() #2
+; CHECK-NEXT:    br label [[IF_END]]
+; CHECK:       if.end:
+; CHECK-NEXT:    ret i32 [[SADD_RESULT]]
+;
+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
+  %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
+}
+
+; 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 {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[A:%.*]] to i64
+; CHECK-NEXT:    [[CONV2:%.*]] = sext i32 [[B:%.*]] to i64
+; CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[CONV2]], [[CONV]]
+; CHECK-NEXT:    [[ADD_OFF:%.*]] = add nsw i64 [[ADD]], 2147483648
+; CHECK-NEXT:    store i64 [[ADD_OFF]], i64* [[P:%.*]], align 4
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp ugt i64 [[ADD_OFF]], 4294967295
+; CHECK-NEXT:    br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @throwAnExceptionOrWhatever() #2
+; CHECK-NEXT:    br label [[IF_END]]
+; CHECK:       if.end:
+; CHECK-NEXT:    [[CONV9:%.*]] = trunc i64 [[ADD]] to i32
+; CHECK-NEXT:    ret i32 [[CONV9]]
+;
+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
+  %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
+}
+
+; 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 {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[A:%.*]] to i64
+; CHECK-NEXT:    [[CONV2:%.*]] = sext i32 [[B:%.*]] to i64
+; CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[CONV2]], [[CONV]]
+; CHECK-NEXT:    [[ADD_OFF:%.*]] = add nsw i64 [[ADD]], 2147483648
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp ugt i64 [[ADD_OFF]], 4294967295
+; CHECK-NEXT:    br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @throwAnExceptionOrWhatever() #2
+; CHECK-NEXT:    br label [[IF_END]]
+; CHECK:       if.end:
+; CHECK-NEXT:    ret i64 [[ADD]]
+;
+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
+  %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
+}
+
+; Should be able to form an i8 sadd computed in an i32.
+
+define zeroext i8 @test4(i8 signext %a, i8 signext %b) nounwind ssp {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[SADD:%.*]] = call { i8, i1 } @llvm.sadd.with.overflow.i8(i8 [[B:%.*]], i8 [[A:%.*]])
+; CHECK-NEXT:    [[CMP:%.*]] = extractvalue { i8, i1 } [[SADD]], 1
+; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @throwAnExceptionOrWhatever() #2
+; CHECK-NEXT:    unreachable
+; CHECK:       if.end:
+; CHECK-NEXT:    [[SADD_RESULT:%.*]] = extractvalue { i8, i1 } [[SADD]], 0
+; CHECK-NEXT:    ret i8 [[SADD_RESULT]]
+;
+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
+if.then:
+  tail call void @throwAnExceptionOrWhatever() nounwind
+  unreachable
+
+if.end:
+  %conv7 = trunc i32 %add to i8
+  ret i8 %conv7
+}
+
+; 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 {
+; CHECK-LABEL: @test8(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[ADD:%.*]] = add i64 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[ADD_OFF:%.*]] = add i64 [[ADD]], 2147483648
+; CHECK-NEXT:    [[TMP0:%.*]] = icmp ugt i64 [[ADD_OFF]], 4294967295
+; CHECK-NEXT:    br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    tail call void @throwAnExceptionOrWhatever() #2
+; CHECK-NEXT:    br label [[IF_END]]
+; CHECK:       if.end:
+; CHECK-NEXT:    [[CONV9:%.*]] = trunc i64 [[ADD]] to i32
+; CHECK-NEXT:    ret i32 [[CONV9]]
+;
+entry:
+  %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
+}
+