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e3e67d4a0a
This changes the SelectionDAG scheduling preference to source order. Soon, the SelectionDAG scheduler can be bypassed saving a nice chunk of compile time. Performance differences that result from this change are often a consequence of register coalescing. The register coalescer is far from perfect. Bugs can be filed for deficiencies. On x86 SandyBridge/Haswell, the source order schedule is often preserved, particularly for small blocks. Register pressure is generally improved over the SD scheduler's ILP mode. However, we are still able to handle large blocks that require latency hiding, unlike the SD scheduler's BURR mode. MI scheduler also attempts to discover the critical path in single-block loops and adjust heuristics accordingly. The MI scheduler relies on the new machine model. This is currently unimplemented for AVX, so we may not be generating the best code yet. Unit tests are updated so they don't depend on SD scheduling heuristics. llvm-svn: 192750
28 lines
969 B
LLVM
28 lines
969 B
LLVM
; RUN: llc < %s -march=x86-64 -mcpu=corei7 | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i8:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%union.anon = type { <2 x i8> }
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@i = global <2 x i8> <i8 150, i8 100>, align 8
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@j = global <2 x i8> <i8 10, i8 13>, align 8
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@res = common global %union.anon zeroinitializer, align 8
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; Make sure we load the constants i and j starting offset zero.
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; Also make sure that we sign-extend it.
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; Based on /gcc-4_2-testsuite/src/gcc.c-torture/execute/pr23135.c
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; CHECK: main
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define i32 @main() nounwind uwtable {
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entry:
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; CHECK: pmovsxbq i(%rip), %
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; CHECK: pmovsxbq j(%rip), %
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%0 = load <2 x i8>* @i, align 8
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%1 = load <2 x i8>* @j, align 8
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%div = sdiv <2 x i8> %1, %0
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store <2 x i8> %div, <2 x i8>* getelementptr inbounds (%union.anon* @res, i32 0, i32 0), align 8
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ret i32 0
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; CHECK: ret
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}
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