diff options
| -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 0c02f19198..89d952a5b0 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 0000000000..f66f90c0b0 --- /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 +} |