enhance vmcore to know that udiv's can be exact, and add a trivial
instcombine xform to exercise this.
Nothing forms exact udivs yet though. This is progress on PR8862
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124992 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Assembler/flags.ll b/test/Assembler/flags.ll
index 3241909..82b35b5 100644
--- a/test/Assembler/flags.ll
+++ b/test/Assembler/flags.ll
@@ -104,6 +104,19 @@
ret i64 %z
}
+define i64 @udiv_exact(i64 %x, i64 %y) {
+; CHECK: %z = udiv exact i64 %x, %y
+ %z = udiv exact i64 %x, %y
+ ret i64 %z
+}
+
+define i64 @udiv_plain(i64 %x, i64 %y) {
+; CHECK: %z = udiv i64 %x, %y
+ %z = udiv i64 %x, %y
+ ret i64 %z
+}
+
+
define i64* @gep_nw(i64* %p, i64 %x) {
; CHECK: %z = getelementptr inbounds i64* %p, i64 %x
%z = getelementptr inbounds i64* %p, i64 %x
@@ -136,6 +149,11 @@
ret i64 sdiv exact (i64 ptrtoint (i64* @addr to i64), i64 91)
}
+define i64 @udiv_exact_ce() {
+; CHECK: ret i64 udiv exact (i64 ptrtoint (i64* @addr to i64), i64 91)
+ ret i64 udiv exact (i64 ptrtoint (i64* @addr to i64), i64 91)
+}
+
define i64* @gep_nw_ce() {
; CHECK: ret i64* getelementptr inbounds (i64* @addr, i64 171)
ret i64* getelementptr inbounds (i64* @addr, i64 171)
@@ -210,3 +228,4 @@
; CHECK: ret i64 mul nuw (i64 ptrtoint (i64* @addr to i64), i64 91)
ret i64 mul nuw (i64 ptrtoint (i64* @addr to i64), i64 91)
}
+
diff --git a/test/Transforms/InstCombine/exact-sdiv.ll b/test/Transforms/InstCombine/exact.ll
similarity index 86%
rename from test/Transforms/InstCombine/exact-sdiv.ll
rename to test/Transforms/InstCombine/exact.ll
index e567754..940469e 100644
--- a/test/Transforms/InstCombine/exact-sdiv.ll
+++ b/test/Transforms/InstCombine/exact.ll
@@ -50,3 +50,11 @@
%z = mul i32 %y, -3
ret i32 %z
}
+
+; CHECK: i32 @b2
+; CHECK: ret i32 %x
+define i32 @b2(i32 %x, i32 %w) {
+ %y = udiv exact i32 %x, %w
+ %z = mul i32 %y, %w
+ ret i32 %z
+}