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llvm-6502/test/CodeGen/X86/psubus.ll
Benjamin Kramer 388fc6a988 X86: Add a couple of target-specific dag combines that turn VSELECTS into psubus if possible. 
We match the pattern "x >= y ? x-y : 0" into "subus x, y" and two special cases
if y is a constant. DAGCombiner canonicalizes those so we first have to undo the
canonicalization for those cases. The pattern occurs in gzip when the loop
vectorizer is enabled. Part of PR14613.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170273 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-15 16:47:44 +00:00

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; RUN: llc -mcpu=core2 < %s | FileCheck %s -check-prefix=SSE2
; RUN: llc -mcpu=corei7-avx < %s | FileCheck %s -check-prefix=AVX1
; RUN: llc -mcpu=core-avx2 < %s | FileCheck %s -check-prefix=AVX2
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-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"
target triple = "x86_64-apple-macosx10.8.0"
define void @test1(i16* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i16* %head, i64 %index
%1 = bitcast i16* %0 to <8 x i16>*
%2 = load <8 x i16>* %1, align 2
%3 = icmp slt <8 x i16> %2, zeroinitializer
%4 = xor <8 x i16> %2, <i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768>
%5 = select <8 x i1> %3, <8 x i16> %4, <8 x i16> zeroinitializer
store <8 x i16> %5, <8 x i16>* %1, align 2
%index.next = add i64 %index, 8
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; SSE2: @test1
; SSE2: psubusw LCPI0_0(%rip), %xmm0
; AVX1: @test1
; AVX1: vpsubusw LCPI0_0(%rip), %xmm0, %xmm0
; AVX2: @test1
; AVX2: vpsubusw LCPI0_0(%rip), %xmm0, %xmm0
}
define void @test2(i16* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i16* %head, i64 %index
%1 = bitcast i16* %0 to <8 x i16>*
%2 = load <8 x i16>* %1, align 2
%3 = icmp ugt <8 x i16> %2, <i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766>
%4 = add <8 x i16> %2, <i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767>
%5 = select <8 x i1> %3, <8 x i16> %4, <8 x i16> zeroinitializer
store <8 x i16> %5, <8 x i16>* %1, align 2
%index.next = add i64 %index, 8
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; SSE2: @test2
; SSE2: psubusw LCPI1_0(%rip), %xmm0
; AVX1: @test2
; AVX1: vpsubusw LCPI1_0(%rip), %xmm0, %xmm0
; AVX2: @test2
; AVX2: vpsubusw LCPI1_0(%rip), %xmm0, %xmm0
}
define void @test3(i16* nocapture %head, i16 zeroext %w) nounwind {
vector.ph:
%0 = insertelement <8 x i16> undef, i16 %w, i32 0
%broadcast15 = shufflevector <8 x i16> %0, <8 x i16> undef, <8 x i32> zeroinitializer
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%1 = getelementptr inbounds i16* %head, i64 %index
%2 = bitcast i16* %1 to <8 x i16>*
%3 = load <8 x i16>* %2, align 2
%4 = icmp ult <8 x i16> %3, %broadcast15
%5 = sub <8 x i16> %3, %broadcast15
%6 = select <8 x i1> %4, <8 x i16> zeroinitializer, <8 x i16> %5
store <8 x i16> %6, <8 x i16>* %2, align 2
%index.next = add i64 %index, 8
%7 = icmp eq i64 %index.next, 16384
br i1 %7, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; SSE2: @test3
; SSE2: psubusw %xmm0, %xmm1
; AVX1: @test3
; AVX1: vpsubusw %xmm0, %xmm1, %xmm1
; AVX2: @test3
; AVX2: vpsubusw %xmm0, %xmm1, %xmm1
}
define void @test4(i8* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i8* %head, i64 %index
%1 = bitcast i8* %0 to <16 x i8>*
%2 = load <16 x i8>* %1, align 1
%3 = icmp slt <16 x i8> %2, zeroinitializer
%4 = xor <16 x i8> %2, <i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128>
%5 = select <16 x i1> %3, <16 x i8> %4, <16 x i8> zeroinitializer
store <16 x i8> %5, <16 x i8>* %1, align 1
%index.next = add i64 %index, 16
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; SSE2: @test4
; SSE2: psubusb LCPI3_0(%rip), %xmm0
; AVX1: @test4
; AVX1: vpsubusb LCPI3_0(%rip), %xmm0, %xmm0
; AVX2: @test4
; AVX2: vpsubusb LCPI3_0(%rip), %xmm0, %xmm0
}
define void @test5(i8* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i8* %head, i64 %index
%1 = bitcast i8* %0 to <16 x i8>*
%2 = load <16 x i8>* %1, align 1
%3 = icmp ugt <16 x i8> %2, <i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126>
%4 = add <16 x i8> %2, <i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127>
%5 = select <16 x i1> %3, <16 x i8> %4, <16 x i8> zeroinitializer
store <16 x i8> %5, <16 x i8>* %1, align 1
%index.next = add i64 %index, 16
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; SSE2: @test5
; SSE2: psubusb LCPI4_0(%rip), %xmm0
; AVX1: @test5
; AVX1: vpsubusb LCPI4_0(%rip), %xmm0, %xmm0
; AVX2: @test5
; AVX2: vpsubusb LCPI4_0(%rip), %xmm0, %xmm0
}
define void @test6(i8* nocapture %head, i8 zeroext %w) nounwind {
vector.ph:
%0 = insertelement <16 x i8> undef, i8 %w, i32 0
%broadcast15 = shufflevector <16 x i8> %0, <16 x i8> undef, <16 x i32> zeroinitializer
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%1 = getelementptr inbounds i8* %head, i64 %index
%2 = bitcast i8* %1 to <16 x i8>*
%3 = load <16 x i8>* %2, align 1
%4 = icmp ult <16 x i8> %3, %broadcast15
%5 = sub <16 x i8> %3, %broadcast15
%6 = select <16 x i1> %4, <16 x i8> zeroinitializer, <16 x i8> %5
store <16 x i8> %6, <16 x i8>* %2, align 1
%index.next = add i64 %index, 16
%7 = icmp eq i64 %index.next, 16384
br i1 %7, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; SSE2: @test6
; SSE2: psubusb %xmm0, %xmm1
; AVX1: @test6
; AVX1: vpsubusb %xmm0, %xmm1, %xmm1
; AVX2: @test6
; AVX2: vpsubusb %xmm0, %xmm1, %xmm1
}
define void @test7(i16* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i16* %head, i64 %index
%1 = bitcast i16* %0 to <16 x i16>*
%2 = load <16 x i16>* %1, align 2
%3 = icmp slt <16 x i16> %2, zeroinitializer
%4 = xor <16 x i16> %2, <i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768>
%5 = select <16 x i1> %3, <16 x i16> %4, <16 x i16> zeroinitializer
store <16 x i16> %5, <16 x i16>* %1, align 2
%index.next = add i64 %index, 8
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; AVX2: @test7
; AVX2: vpsubusw LCPI6_0(%rip), %ymm0, %ymm0
}
define void @test8(i16* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i16* %head, i64 %index
%1 = bitcast i16* %0 to <16 x i16>*
%2 = load <16 x i16>* %1, align 2
%3 = icmp ugt <16 x i16> %2, <i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766, i16 32766>
%4 = add <16 x i16> %2, <i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767, i16 -32767>
%5 = select <16 x i1> %3, <16 x i16> %4, <16 x i16> zeroinitializer
store <16 x i16> %5, <16 x i16>* %1, align 2
%index.next = add i64 %index, 8
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; AVX2: @test8
; AVX2: vpsubusw LCPI7_0(%rip), %ymm0, %ymm0
}
define void @test9(i16* nocapture %head, i16 zeroext %w) nounwind {
vector.ph:
%0 = insertelement <16 x i16> undef, i16 %w, i32 0
%broadcast15 = shufflevector <16 x i16> %0, <16 x i16> undef, <16 x i32> zeroinitializer
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%1 = getelementptr inbounds i16* %head, i64 %index
%2 = bitcast i16* %1 to <16 x i16>*
%3 = load <16 x i16>* %2, align 2
%4 = icmp ult <16 x i16> %3, %broadcast15
%5 = sub <16 x i16> %3, %broadcast15
%6 = select <16 x i1> %4, <16 x i16> zeroinitializer, <16 x i16> %5
store <16 x i16> %6, <16 x i16>* %2, align 2
%index.next = add i64 %index, 8
%7 = icmp eq i64 %index.next, 16384
br i1 %7, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; AVX2: @test9
; AVX2: vpsubusw %ymm0, %ymm1, %ymm1
}
define void @test10(i8* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i8* %head, i64 %index
%1 = bitcast i8* %0 to <32 x i8>*
%2 = load <32 x i8>* %1, align 1
%3 = icmp slt <32 x i8> %2, zeroinitializer
%4 = xor <32 x i8> %2, <i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128, i8 -128>
%5 = select <32 x i1> %3, <32 x i8> %4, <32 x i8> zeroinitializer
store <32 x i8> %5, <32 x i8>* %1, align 1
%index.next = add i64 %index, 16
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; AVX2: @test10
; AVX2: vpsubusb LCPI9_0(%rip), %ymm0, %ymm0
}
define void @test11(i8* nocapture %head) nounwind {
vector.ph:
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%0 = getelementptr inbounds i8* %head, i64 %index
%1 = bitcast i8* %0 to <32 x i8>*
%2 = load <32 x i8>* %1, align 1
%3 = icmp ugt <32 x i8> %2, <i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126, i8 126>
%4 = add <32 x i8> %2, <i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127, i8 -127>
%5 = select <32 x i1> %3, <32 x i8> %4, <32 x i8> zeroinitializer
store <32 x i8> %5, <32 x i8>* %1, align 1
%index.next = add i64 %index, 16
%6 = icmp eq i64 %index.next, 16384
br i1 %6, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; AVX2: @test11
; AVX2: vpsubusb LCPI10_0(%rip), %ymm0, %ymm0
}
define void @test12(i8* nocapture %head, i8 zeroext %w) nounwind {
vector.ph:
%0 = insertelement <32 x i8> undef, i8 %w, i32 0
%broadcast15 = shufflevector <32 x i8> %0, <32 x i8> undef, <32 x i32> zeroinitializer
br label %vector.body
vector.body: ; preds = %vector.body, %vector.ph
%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
%1 = getelementptr inbounds i8* %head, i64 %index
%2 = bitcast i8* %1 to <32 x i8>*
%3 = load <32 x i8>* %2, align 1
%4 = icmp ult <32 x i8> %3, %broadcast15
%5 = sub <32 x i8> %3, %broadcast15
%6 = select <32 x i1> %4, <32 x i8> zeroinitializer, <32 x i8> %5
store <32 x i8> %6, <32 x i8>* %2, align 1
%index.next = add i64 %index, 16
%7 = icmp eq i64 %index.next, 16384
br i1 %7, label %for.end, label %vector.body
for.end: ; preds = %vector.body
ret void
; AVX2: @test12
; AVX2: vpsubusb %ymm0, %ymm1, %ymm1
}
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