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Add support for load folding of avx1 logical instructions

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AVX supports logical operations using an operand from memory. Unfortunately
because integer operations were not added until AVX2 the AVX1 logical
operation's types were preventing the isel from folding the loads. In a limited
number of cases the peephole optimizer would fold the loads, but most were
missed. This patch adds explicit patterns with appropriate casts in order for
these loads to be folded.

The included test cases run on reduced examples and disable the peephole
optimizer to ensure the folds are being pattern matched.

Patch by Louis Gerbarg <lgg@apple.com>

rdar://16355124

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205938 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2014-04-09 23:39:25 +00:00
parent e9915738be
commit afb4ef3549
2 changed files with 73 additions and 0 deletions
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13
lib/Target/X86/X86InstrSSE.td
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@ -2973,6 +2973,19 @@ defm XOR : sse12_fp_packed_logical<0x57, "xor", xor>;
let isCommutable = 0 in
defm ANDN : sse12_fp_packed_logical<0x55, "andn", X86andnp>;
// AVX1 requires type coercions in order to fold loads directly into logical
// operations.
let Predicates = [HasAVX1Only] in {
def : Pat<(bc_v8f32 (and VR256:$src1, (loadv4i64 addr:$src2))),
(VANDPSYrm VR256:$src1, addr:$src2)>;
def : Pat<(bc_v8f32 (or VR256:$src1, (loadv4i64 addr:$src2))),
(VORPSYrm VR256:$src1, addr:$src2)>;
def : Pat<(bc_v8f32 (xor VR256:$src1, (loadv4i64 addr:$src2))),
(VXORPSYrm VR256:$src1, addr:$src2)>;
def : Pat<(bc_v8f32 (X86andnp VR256:$src1, (loadv4i64 addr:$src2))),
(VANDNPSYrm VR256:$src1, addr:$src2)>;
}
//===----------------------------------------------------------------------===//
// SSE 1 & 2 - Arithmetic Instructions
//===----------------------------------------------------------------------===//

60
test/CodeGen/X86/avx1-logical-load-folding.ll Normal file
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@ -0,0 +1,60 @@
; RUN: llc -O3 -disable-peephole -mattr=-avx2 < %s | FileCheck %s
target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9.0"
; Function Attrs: nounwind ssp uwtable
define void @test1(float* %A, float* %C) #0 {
%tmp1 = bitcast float* %A to <8 x float>*
%tmp2 = load <8 x float>* %tmp1, align 32
%tmp3 = bitcast <8 x float> %tmp2 to <8 x i32>
%tmp4 = and <8 x i32> %tmp3, <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
%tmp5 = bitcast <8 x i32> %tmp4 to <8 x float>
%tmp6 = extractelement <8 x float> %tmp5, i32 0
store float %tmp6, float* %C
ret void
; CHECK: vandps LCPI0_0(%rip), %ymm0, %ymm0
}
; Function Attrs: nounwind ssp uwtable
define void @test2(float* %A, float* %C) #0 {
%tmp1 = bitcast float* %A to <8 x float>*
%tmp2 = load <8 x float>* %tmp1, align 32
%tmp3 = bitcast <8 x float> %tmp2 to <8 x i32>
%tmp4 = or <8 x i32> %tmp3, <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
%tmp5 = bitcast <8 x i32> %tmp4 to <8 x float>
%tmp6 = extractelement <8 x float> %tmp5, i32 0
store float %tmp6, float* %C
ret void
; CHECK: vorps LCPI1_0(%rip), %ymm0, %ymm0
}
; Function Attrs: nounwind ssp uwtable
define void @test3(float* %A, float* %C) #0 {
%tmp1 = bitcast float* %A to <8 x float>*
%tmp2 = load <8 x float>* %tmp1, align 32
%tmp3 = bitcast <8 x float> %tmp2 to <8 x i32>
%tmp4 = xor <8 x i32> %tmp3, <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
%tmp5 = bitcast <8 x i32> %tmp4 to <8 x float>
%tmp6 = extractelement <8 x float> %tmp5, i32 0
store float %tmp6, float* %C
ret void
; CHECK: vxorps LCPI2_0(%rip), %ymm0, %ymm0
}
define void @test4(float* %A, float* %C) #0 {
%tmp1 = bitcast float* %A to <8 x float>*
%tmp2 = load <8 x float>* %tmp1, align 32
%tmp3 = bitcast <8 x float> %tmp2 to <8 x i32>
%tmp4 = xor <8 x i32> %tmp3, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
%tmp5 = and <8 x i32> %tmp4, <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
%tmp6 = bitcast <8 x i32> %tmp5 to <8 x float>
%tmp7 = extractelement <8 x float> %tmp6, i32 0
store float %tmp7, float * %C
ret void
;CHECK: vandnps LCPI3_0(%rip), %ymm0, %ymm0
}