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author | Rafael Espindola <rafael.espindola@gmail.com> | 2014-05-28 21:43:52 +0000 |
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committer | Rafael Espindola <rafael.espindola@gmail.com> | 2014-05-28 21:43:52 +0000 |
commit | c81cf72ef34bfc846bc9f271f590e8e02e38061b (patch) | |
tree | 697ee359ec2480718aa00f5782196bdab29faa9b /test | |
parent | 836475b2e2b45d34bcc558497f47a87585157254 (diff) | |
download | llvm-c81cf72ef34bfc846bc9f271f590e8e02e38061b.tar.gz llvm-c81cf72ef34bfc846bc9f271f590e8e02e38061b.tar.bz2 llvm-c81cf72ef34bfc846bc9f271f590e8e02e38061b.tar.xz |
Revert "Revert "InstCombine: Improvement to check if signed addition overflows.""
This reverts commit r209762, bringing back r209746. It was not responsible for the libc++ build failure
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209776 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/Transforms/InstCombine/AddOverflow.ll | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/AddOverflow.ll b/test/Transforms/InstCombine/AddOverflow.ll new file mode 100644 index 0000000000..1bbd1fc59a --- /dev/null +++ b/test/Transforms/InstCombine/AddOverflow.ll @@ -0,0 +1,56 @@ +; RUN: opt < %s -instcombine -S | FileCheck %s + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +; CHECK-LABEL: @ripple( +; CHECK: add nsw i16 %tmp1, 1 +define i32 @ripple(i16 signext %x) { +bb: + %tmp = sext i16 %x to i32 + %tmp1 = and i32 %tmp, -5 + %tmp2 = trunc i32 %tmp1 to i16 + %tmp3 = sext i16 %tmp2 to i32 + %tmp4 = add i32 %tmp3, 1 + ret i32 %tmp4 +} + +; CHECK-LABEL: @ripplenot( +; CHECK: add i32 %tmp3, 4 +define i32 @ripplenot(i16 signext %x) { +bb: + %tmp = sext i16 %x to i32 + %tmp1 = and i32 %tmp, -3 + %tmp2 = trunc i32 %tmp1 to i16 + %tmp3 = sext i16 %tmp2 to i32 + %tmp4 = add i32 %tmp3, 4 + ret i32 %tmp4 +} + +; CHECK-LABEL: @oppositesign( +; CHECK: add nsw i16 %tmp1, 4 +define i32 @oppositesign(i16 signext %x) { +bb: + %tmp = sext i16 %x to i32 + %tmp1 = or i32 %tmp, 32768 + %tmp2 = trunc i32 %tmp1 to i16 + %tmp3 = sext i16 %tmp2 to i32 + %tmp4 = add i32 %tmp3, 4 + ret i32 %tmp4 +} + +; CHECK-LABEL: @ripplenot_var( +; CHECK: add i32 %tmp6, %tmp7 +define i32 @ripplenot_var(i16 signext %x, i16 signext %y) { +bb: + %tmp = sext i16 %x to i32 + %tmp1 = and i32 %tmp, -5 + %tmp2 = trunc i32 %tmp1 to i16 + %tmp3 = sext i16 %y to i32 + %tmp4 = or i32 %tmp3, 2 + %tmp5 = trunc i32 %tmp4 to i16 + %tmp6 = sext i16 %tmp5 to i32 + %tmp7 = sext i16 %tmp2 to i32 + %tmp8 = add i32 %tmp6, %tmp7 + ret i32 %tmp8 +} |