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| author | Chris Lattner <sabre@nondot.org> | 2009-06-30 04:20:46 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-06-30 04:20:46 +0000 |
| commit | a05ec61684fa56f4028761d9a0beddc70bee473e (patch) | |
| tree | 320347188989c1e7cfe78aaa61d87d22fa2ff487 /lib/Target/X86/README.txt | |
| parent | 9cdd4f57c85908e82e12cb996f71fd34fb43bccc (diff) | |
| download | external_llvm-a05ec61684fa56f4028761d9a0beddc70bee473e.zip external_llvm-a05ec61684fa56f4028761d9a0beddc70bee473e.tar.gz external_llvm-a05ec61684fa56f4028761d9a0beddc70bee473e.tar.bz2 | |
add a note
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74508 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/README.txt')
| -rw-r--r-- | lib/Target/X86/README.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 4464878..711f1d2 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -1932,3 +1932,23 @@ Replacing an icmp+select with a shift should always be considered profitable in instcombine. //===---------------------------------------------------------------------===// + +It looks like we don't have patterns (or they aren't matching) for adc with +immediate: + +define i64 @f1(i64 %a) nounwind { + %tmp = sub i64 %a, 734439407618 + ret i64 %tmp +} +$ llvm-as < t.ll | llc -march=x86 + +_f1: + movl 4(%esp), %eax + addl $4294967294, %eax + movl $4294967124, %edx + adcl 8(%esp), %edx + ret + +There is no need to clobber %edx there. + +//===---------------------------------------------------------------------===// |