Quentin Colombet 8201185d61 [X86] Custom lower UINT_TO_FP from v4f32 to v4i32, and for v8f32 to v8i32 if ... AVX2 is available. According to IACA, the new lowering has a throughput of 8 cycles instead of 13 with the previous one. Althought this lowering kicks in some SPECs benchmarks, the performance improvement was within the noise. Correctness testing has been done for the whole range of uint32_t with the following program: uint4 v = (uint4) {0,1,2,3}; uint32_t i; //Check correctness over entire range for uint4 -> float4 conversion for( i = 0; i < 1U << (32-2); i++ ) { float4 t = test(v); float4 c = correct(v); if( 0xf != _mm_movemask_ps( t == c )) { printf( "Error @ %vx: %vf vs. %vf\n", v, c, t); return -1; } v += 4; } Where "correct" is the old lowering and "test" the new one. The patch adds a test case for the two custom lowering instruction. It also modifies the vector cost model, which is why cast.ll and uitofp.ll are modified. 2009-02-26-MachineLICMBug.ll is also modified because we now hoist 7 instructions instead of 4 (3 more constant loads). rdar://problem/18153096> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221657 91177308-0d34-0410-b5e6-96231b3b80d8		2014-11-11 02:23:47 +00:00
..
AArch64	Reduce verbiage of lit.local.cfg files	2014-06-09 22:42:55 +00:00
ARM	[ARM] Teach the cost model that cross-class copies are costly.	2014-09-12 13:29:40 +00:00
PowerPC	Fix BasicTTI::getCmpSelInstrCost to deal with illegal vector types	2014-09-16 04:35:50 +00:00
X86	[X86] Custom lower UINT_TO_FP from v4f32 to v4i32, and for v8f32 to v8i32 if	2014-11-11 02:23:47 +00:00
no_info.ll	Make opt grab the triple from the module and use it to initialize the target machine.	2013-01-01 08:00:32 +00:00