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author | Chris Lattner <sabre@nondot.org> | 2011-02-06 21:44:57 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2011-02-06 21:44:57 +0000 |
commit | 35bda8914c0d1c02a6f90f42e7810c83150737e1 (patch) | |
tree | b210ccd009a7ac5331c76c6393b5b45d141d12d0 /test/Transforms/InstCombine/exact.ll | |
parent | bd75021465e7f8c81785e692cfd3ce559764e46f (diff) | |
download | external_llvm-35bda8914c0d1c02a6f90f42e7810c83150737e1.zip external_llvm-35bda8914c0d1c02a6f90f42e7810c83150737e1.tar.gz external_llvm-35bda8914c0d1c02a6f90f42e7810c83150737e1.tar.bz2 |
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
Diffstat (limited to 'test/Transforms/InstCombine/exact.ll')
-rw-r--r-- | test/Transforms/InstCombine/exact.ll | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/exact.ll b/test/Transforms/InstCombine/exact.ll new file mode 100644 index 0000000..940469e --- /dev/null +++ b/test/Transforms/InstCombine/exact.ll @@ -0,0 +1,60 @@ +; RUN: opt < %s -instcombine -S | FileCheck %s + +; CHECK: define i32 @foo +; CHECK: sdiv i32 %x, 8 +define i32 @foo(i32 %x) { + %y = sdiv i32 %x, 8 + ret i32 %y +} + +; CHECK: define i32 @bar +; CHECK: ashr i32 %x, 3 +define i32 @bar(i32 %x) { + %y = sdiv exact i32 %x, 8 + ret i32 %y +} + +; CHECK: i32 @a0 +; CHECK: %y = srem i32 %x, 3 +; CHECK: %z = sub i32 %x, %y +; CHECK: ret i32 %z +define i32 @a0(i32 %x) { + %y = sdiv i32 %x, 3 + %z = mul i32 %y, 3 + ret i32 %z +} + +; CHECK: i32 @b0 +; CHECK: ret i32 %x +define i32 @b0(i32 %x) { + %y = sdiv exact i32 %x, 3 + %z = mul i32 %y, 3 + ret i32 %z +} + +; CHECK: i32 @a1 +; CHECK: %y = srem i32 %x, 3 +; CHECK: %z = sub i32 %y, %x +; CHECK: ret i32 %z +define i32 @a1(i32 %x) { + %y = sdiv i32 %x, 3 + %z = mul i32 %y, -3 + ret i32 %z +} + +; CHECK: i32 @b1 +; CHECK: %z = sub i32 0, %x +; CHECK: ret i32 %z +define i32 @b1(i32 %x) { + %y = sdiv exact i32 %x, 3 + %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 +} |