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| author | Chris Lattner <sabre@nondot.org> | 2010-12-20 01:37:09 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-12-20 01:37:09 +0000 |
| commit | 23a0199f05fe61c4bde921d5729ed2b927657bcb (patch) | |
| tree | 8e8ed38c5ca3e41a97332cc4730c770590d79dd8 /test/CodeGen | |
| parent | 636f15ff04c9188ea3bf91477fda1cc29f2c4a61 (diff) | |
| download | external_llvm-23a0199f05fe61c4bde921d5729ed2b927657bcb.zip external_llvm-23a0199f05fe61c4bde921d5729ed2b927657bcb.tar.gz external_llvm-23a0199f05fe61c4bde921d5729ed2b927657bcb.tar.bz2 | |
now that addc/adde are gone, "ADDC" in the X86 backend uses EFLAGS results,
the same as setcc. Optimize ADDC(0,0,FLAGS) -> SET_CARRY(FLAGS). This is
a step towards finishing off PR5443. In the testcase in that bug we now get:
movq %rdi, %rax
addq %rsi, %rax
sbbq %rcx, %rcx
testb $1, %cl
setne %dl
ret
instead of:
movq %rdi, %rax
addq %rsi, %rax
movl $0, %ecx
adcq $0, %rcx
testq %rcx, %rcx
setne %dl
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122219 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
| -rw-r--r-- | test/CodeGen/X86/add.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGen/X86/add.ll b/test/CodeGen/X86/add.ll index 1201c06..d6e99ee 100644 --- a/test/CodeGen/X86/add.ll +++ b/test/CodeGen/X86/add.ll @@ -101,3 +101,22 @@ define {i32, i1} @test7(i32 %v1, i32 %v2) nounwind { ; X64: addl %esi, %eax ; X64-NEXT: setb %dl ; X64-NEXT: ret + +; PR5443 +define {i64, i1} @test8(i64 %left, i64 %right) nounwind { +entry: + %extleft = zext i64 %left to i65 + %extright = zext i64 %right to i65 + %sum = add i65 %extleft, %extright + %res.0 = trunc i65 %sum to i64 + %overflow = and i65 %sum, -18446744073709551616 + %res.1 = icmp ne i65 %overflow, 0 + %final0 = insertvalue {i64, i1} undef, i64 %res.0, 0 + %final1 = insertvalue {i64, i1} %final0, i1 %res.1, 1 + ret {i64, i1} %final1 +} + +; X64: test8: +; X64: addq +; X64-NEXT: sbbq +; X64-NEXT: testb |