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| author | Erik Verbruggen <erikjv@me.com> | 2014-03-28 14:50:57 +0000 |
|---|---|---|
| committer | Erik Verbruggen <erikjv@me.com> | 2014-03-28 14:50:57 +0000 |
| commit | 76eb786cf79ce1c3c167c8cb19cfc37aa9b2aafd (patch) | |
| tree | a545d08e676360fa81f056f1e947665480878661 /lib/Target/README.txt | |
| parent | cc58a593a2b975bd46a25749287872d0d6978488 (diff) | |
| download | llvm-76eb786cf79ce1c3c167c8cb19cfc37aa9b2aafd.tar.gz llvm-76eb786cf79ce1c3c167c8cb19cfc37aa9b2aafd.tar.bz2 llvm-76eb786cf79ce1c3c167c8cb19cfc37aa9b2aafd.tar.xz | |
Revert "InstCombine: merge constants in both operands of icmp."
This reverts commit r204912, and follow-up commit r204948.
This introduced a performance regression, and the fix is not completely
clear yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205010 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 4ecacf9d01..a9aab86abd 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -930,6 +930,18 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts". //===---------------------------------------------------------------------===// +int g(int x) { return (x - 10) < 0; } +Should combine to "x <= 9" (the sub has nsw). Currently not +optimized with "clang -emit-llvm-bc | opt -std-compile-opts". + +//===---------------------------------------------------------------------===// + +int g(int x) { return (x + 10) < 0; } +Should combine to "x < -10" (the add has nsw). Currently not +optimized with "clang -emit-llvm-bc | opt -std-compile-opts". + +//===---------------------------------------------------------------------===// + int f(int i, int j) { return i < j + 1; } int g(int i, int j) { return j > i - 1; } Should combine to "i <= j" (the add/sub has nsw). Currently not |