Extend ConstantFolding to understand signed overflow variants

llvm-svn: 83338

1 files changed, 120 insertions, 1 deletions

diff --git a/llvm/test/Transforms/ConstProp/overflow-ops.ll b/llvm/test/Transforms/ConstProp/overflow-ops.ll
index 52d59217b49..1547a4d0f5b 100644
--- a/llvm/test/Transforms/ConstProp/overflow-ops.ll
+++ b/llvm/test/Transforms/ConstProp/overflow-ops.ll
@@ -24,7 +24,6 @@ entry:
 ; CHECK: ret %i8i1 { i8 6, i1 true }
 }
 
-
 ;;-----------------------------
 ;; usub
 ;;-----------------------------
@@ -47,7 +46,127 @@ entry:
 ; CHECK: ret %i8i1 { i8 -2, i1 true }
 }
 
+;;-----------------------------
+;; sadd
+;;-----------------------------
+
+define {i8, i1} @sadd_1() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 42, i8 2)
+  ret {i8, i1} %t
+
+; CHECK: @sadd_1
+; CHECK: ret %i8i1 { i8 44, i1 false }
+}
+
+define {i8, i1} @sadd_2() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 120, i8 10)
+  ret {i8, i1} %t
+
+; CHECK: @sadd_2
+; CHECK: ret %i8i1 { i8 -126, i1 true }
+}
+
+define {i8, i1} @sadd_3() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 -120, i8 10)
+  ret {i8, i1} %t
+
+; CHECK: @sadd_3
+; CHECK: ret %i8i1 { i8 -110, i1 false }
+}
+
+define {i8, i1} @sadd_4() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 -120, i8 -10)
+  ret {i8, i1} %t
+
+; CHECK: @sadd_4
+; CHECK: ret %i8i1 { i8 126, i1 true }
+}
+
+define {i8, i1} @sadd_5() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.sadd.with.overflow.i8(i8 2, i8 -10)
+  ret {i8, i1} %t
+
+; CHECK: @sadd_5
+; CHECK: ret %i8i1 { i8 -8, i1 false }
+}
+
+
+;;-----------------------------
+;; ssub
+;;-----------------------------
+
+define {i8, i1} @ssub_1() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 4, i8 2)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_1
+; CHECK: ret %i8i1 { i8 2, i1 false }
+}
+
+define {i8, i1} @ssub_2() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 4, i8 6)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_2
+; CHECK: ret %i8i1 { i8 -2, i1 false }
+}
+
+define {i8, i1} @ssub_3() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 -10, i8 120)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_3
+; CHECK: ret %i8i1 { i8 126, i1 true }
+}
+
+define {i8, i1} @ssub_3b() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 -10, i8 10)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_3b
+; CHECK: ret %i8i1 { i8 -20, i1 false }
+}
+
+define {i8, i1} @ssub_4() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 120, i8 -10)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_4
+; CHECK: ret %i8i1 { i8 -126, i1 true }
+}
+
+define {i8, i1} @ssub_4b() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 20, i8 -10)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_4b
+; CHECK: ret %i8i1 { i8 30, i1 false }
+}
+
+define {i8, i1} @ssub_5() nounwind {
+entry:
+  %t = call {i8, i1} @llvm.ssub.with.overflow.i8(i8 -20, i8 -10)
+  ret {i8, i1} %t
+
+; CHECK: @ssub_5
+; CHECK: ret %i8i1 { i8 -10, i1 false }
+}
+
 
 
 declare {i8, i1} @llvm.uadd.with.overflow.i8(i8, i8)
 declare {i8, i1} @llvm.usub.with.overflow.i8(i8, i8)
+
+declare {i8, i1} @llvm.sadd.with.overflow.i8(i8, i8)
+declare {i8, i1} @llvm.ssub.with.overflow.i8(i8, i8)