From b6f4872d29136637a3a5dfdf185f5afcbcdd3b2a Mon Sep 17 00:00:00 2001 From: Arnold Schwaighofer Date: Tue, 12 Mar 2013 21:19:22 +0000 Subject: ARM cost model: Increase the cost for vector casts that use the stack Increase the cost of v8/v16-i8 to v8/v16-i32 casts and truncates as the backend currently lowers those using stack accesses. This was responsible for a significant degradation on MultiSource/Benchmarks/Trimaran/enc-pc1/enc-pc1 where we vectorize one loop to a vector factor of 16. After this patch we select a vector factor of 4 which will generate reasonable code. unsigned char cle[32]; void test(short c) { unsigned short compte; for (compte = 0; compte <= 31; compte++) { cle[compte] = cle[compte] ^ c; } } radar://13220512 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176898 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/Analysis/CostModel/ARM/cast.ll | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'test/Analysis/CostModel') diff --git a/test/Analysis/CostModel/ARM/cast.ll b/test/Analysis/CostModel/ARM/cast.ll index 464b6ec..779c438 100644 --- a/test/Analysis/CostModel/ARM/cast.ll +++ b/test/Analysis/CostModel/ARM/cast.ll @@ -152,6 +152,20 @@ define i32 @casts() { ; CHECK: cost of 10 {{.*}} uitofp %r69 = uitofp i64 undef to double + ; Vector cast cost of instructions lowering the cast to the stack. + ; CHECK: cost of 24 {{.*}} sext + %r70 = sext <8 x i8> undef to <8 x i32> + ; CHECK: cost of 48 {{.*}} sext + %r71 = sext <16 x i8> undef to <16 x i32> + ; CHECK: cost of 22 {{.*}} zext + %r72 = zext <8 x i8> undef to <8 x i32> + ; CHECK: cost of 44 {{.*}} zext + %r73 = zext <16 x i8> undef to <16 x i32> + ; CHECK: cost of 19 {{.*}} trunc + %r74 = trunc <8 x i32> undef to <8 x i8> + ; CHECK: cost of 38 {{.*}} trunc + %r75 = trunc <16 x i32> undef to <16 x i8> + ;CHECK: cost of 0 {{.*}} ret ret i32 undef } -- cgit v1.1