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| author | Dan Gohman <djg@cray.com> | 2007-09-17 14:35:24 +0000 |
|---|---|---|
| committer | Dan Gohman <djg@cray.com> | 2007-09-17 14:35:24 +0000 |
| commit | ec59604694230a73c4f272cc3acb46efb8110586 (patch) | |
| tree | e8cdd846b46e06c5cd4b3a49f7eddc2424a846e4 | |
| parent | 74833f20dae1410b290d314e6429b8c8e5dc8acf (diff) | |
| download | external_llvm-ec59604694230a73c4f272cc3acb46efb8110586.zip external_llvm-ec59604694230a73c4f272cc3acb46efb8110586.tar.gz external_llvm-ec59604694230a73c4f272cc3acb46efb8110586.tar.bz2 | |
Use "test reg,reg" in place of "cmp reg,0" for 64-bit operands. This was
previously only done for 32-bit and smaller operands.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42024 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86InstrX86-64.td | 6 | ||||
| -rw-r--r-- | test/CodeGen/X86/cmp0.ll | 7 |
2 files changed, 13 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrX86-64.td b/lib/Target/X86/X86InstrX86-64.td index 0c02f19..89d952a 100644 --- a/lib/Target/X86/X86InstrX86-64.td +++ b/lib/Target/X86/X86InstrX86-64.td @@ -1076,6 +1076,12 @@ def : Pat<(X86tailcall (i64 texternalsym:$dst)), def : Pat<(X86tailcall GR64:$dst), (CALL64r GR64:$dst)>; +// Comparisons. + +// TEST R,R is smaller than CMP R,0 +def : Pat<(X86cmp GR64:$src1, 0), + (TEST64rr GR64:$src1, GR64:$src1)>; + // {s|z}extload bool -> {s|z}extload byte def : Pat<(sextloadi64i1 addr:$src), (MOVSX64rm8 addr:$src)>; def : Pat<(zextloadi64i1 addr:$src), (MOVZX64rm8 addr:$src)>; diff --git a/test/CodeGen/X86/cmp0.ll b/test/CodeGen/X86/cmp0.ll new file mode 100644 index 0000000..f66f90c --- /dev/null +++ b/test/CodeGen/X86/cmp0.ll @@ -0,0 +1,7 @@ +; RUN: llvm-as < %s | llc -march=x86-64 | grep -v cmp + +define i64 @foo(i64 %x) { + %t = icmp eq i64 %x, 0 + %r = zext i1 %t to i64 + ret i64 %r +} |