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| author | Chris Lattner <sabre@nondot.org> | 2010-12-05 02:00:51 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-12-05 02:00:51 +0000 |
| commit | 96908b17ae7df4c838853a41df9a4c034b435446 (patch) | |
| tree | dcd1cafb1d787a430ba7f4c0b5f61b2eb5ac6889 /test | |
| parent | c8c20d14867ea7c5502df88bb0acd8c84526c42f (diff) | |
| download | external_llvm-96908b17ae7df4c838853a41df9a4c034b435446.zip external_llvm-96908b17ae7df4c838853a41df9a4c034b435446.tar.gz external_llvm-96908b17ae7df4c838853a41df9a4c034b435446.tar.bz2 | |
generalize the previous check to handle -1 on either side of the
select, inserting a not to compensate. Add a missing isZero check
that I lost somehow.
This improves codegen of:
void *func(long count) {
return new int[count];
}
from:
__Z4funcl: ## @_Z4funcl
movl $4, %ecx ## encoding: [0xb9,0x04,0x00,0x00,0x00]
movq %rdi, %rax ## encoding: [0x48,0x89,0xf8]
mulq %rcx ## encoding: [0x48,0xf7,0xe1]
testq %rdx, %rdx ## encoding: [0x48,0x85,0xd2]
movq $-1, %rdi ## encoding: [0x48,0xc7,0xc7,0xff,0xff,0xff,0xff]
cmoveq %rax, %rdi ## encoding: [0x48,0x0f,0x44,0xf8]
jmp __Znam ## TAILCALL
## encoding: [0xeb,A]
to:
__Z4funcl: ## @_Z4funcl
movl $4, %ecx ## encoding: [0xb9,0x04,0x00,0x00,0x00]
movq %rdi, %rax ## encoding: [0x48,0x89,0xf8]
mulq %rcx ## encoding: [0x48,0xf7,0xe1]
cmpq $1, %rdx ## encoding: [0x48,0x83,0xfa,0x01]
sbbq %rdi, %rdi ## encoding: [0x48,0x19,0xff]
notq %rdi ## encoding: [0x48,0xf7,0xd7]
orq %rax, %rdi ## encoding: [0x48,0x09,0xc7]
jmp __Znam ## TAILCALL
## encoding: [0xeb,A]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120932 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/select.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/CodeGen/X86/select.ll b/test/CodeGen/X86/select.ll index 8b8fb3b..11ace19a 100644 --- a/test/CodeGen/X86/select.ll +++ b/test/CodeGen/X86/select.ll @@ -153,5 +153,29 @@ define i64 @test10(i64 %x, i64 %y) nounwind readnone ssp noredzone { +define i64 @test11(i64 %x, i64 %y) nounwind readnone ssp noredzone { + %cmp = icmp eq i64 %x, 0 + %cond = select i1 %cmp, i64 %y, i64 -1 + ret i64 %cond +; CHECK: test11: +; CHECK: cmpq $1, %rdi +; CHECK: sbbq %rax, %rax +; CHECK: notq %rax +; CHECK: orq %rsi, %rax +; CHECK: ret +} + +define i64 @test11a(i64 %x, i64 %y) nounwind readnone ssp noredzone { + %cmp = icmp ne i64 %x, 0 + %cond = select i1 %cmp, i64 -1, i64 %y + ret i64 %cond +; CHECK: test11a: +; CHECK: cmpq $1, %rdi +; CHECK: sbbq %rax, %rax +; CHECK: notq %rax +; CHECK: orq %rsi, %rax +; CHECK: ret +} + |