diff options
| author | Dan Gohman <gohman@apple.com> | 2009-08-26 14:59:13 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-08-26 14:59:13 +0000 |
| commit | af70e5c676140a55ec619f552c8fd76b7edf3c6d (patch) | |
| tree | daaa20890ab20b911913f65f5b0f98e309c53883 /test/CodeGen/X86/anyext.ll | |
| parent | 2385e0e22ca482f2896dfa975a08db2f54926c09 (diff) | |
| download | llvm-af70e5c676140a55ec619f552c8fd76b7edf3c6d.tar.gz llvm-af70e5c676140a55ec619f552c8fd76b7edf3c6d.tar.bz2 llvm-af70e5c676140a55ec619f552c8fd76b7edf3c6d.tar.xz | |
Don't use INSERT_SUBREG to model anyext operations on x86-64, as it
leads to partial-register definitions. To help avoid redundant
zero-extensions, also teach the h-register matching patterns that
use movzbl to match anyext as well as zext.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80099 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/anyext.ll')
| -rw-r--r-- | test/CodeGen/X86/anyext.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/CodeGen/X86/anyext.ll b/test/CodeGen/X86/anyext.ll new file mode 100644 index 0000000000..c5f03abee7 --- /dev/null +++ b/test/CodeGen/X86/anyext.ll @@ -0,0 +1,18 @@ +; RUN: llvm-as < %s | llc -march=x86-64 | grep movzbl | count 2 + +; Use movzbl to avoid partial-register updates. + +define i32 @foo(i32 %p, i8 zeroext %x) nounwind { + %q = trunc i32 %p to i8 + %r = udiv i8 %q, %x + %s = zext i8 %r to i32 + %t = and i32 %s, 1 + ret i32 %t +} +define i32 @bar(i32 %p, i16 zeroext %x) nounwind { + %q = trunc i32 %p to i16 + %r = udiv i16 %q, %x + %s = zext i16 %r to i32 + %t = and i32 %s, 1 + ret i32 %t +} |