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R600: Implement TTI:getPopcntSupport

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The test is just copied from X86, and I don't know of a better
way to test it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213351 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-07-18 06:07:13 +00:00
parent c6058e2462
commit a32c319741
4 changed files with 119 additions and 2 deletions
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6
lib/Target/R600/AMDGPUSubtarget.h
View File

@ -123,8 +123,10 @@ public:
if (Size == 32)
return (getGeneration() >= EVERGREEN);
assert(Size == 64);
return (getGeneration() >= SOUTHERN_ISLANDS);
if (Size == 64)
return (getGeneration() >= SOUTHERN_ISLANDS);
return false;
}
bool hasMulU24() const {

8
lib/Target/R600/AMDGPUTargetTransformInfo.cpp
View File

@ -77,6 +77,8 @@ public:
void getUnrollingPreferences(Loop *L,
UnrollingPreferences &UP) const override;
PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const override;
/// @}
};
@ -119,3 +121,9 @@ void AMDGPUTTI::getUnrollingPreferences(Loop *L,
}
}
}
AMDGPUTTI::PopcntSupportKind
AMDGPUTTI::getPopcntSupport(unsigned TyWidth) const {
assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
return ST->hasBCNT(TyWidth) ? PSK_FastHardware : PSK_Software;
}

3
test/Transforms/LoopIdiom/R600/lit.local.cfg Normal file
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@ -0,0 +1,3 @@
if not 'R600' in config.root.targets:
config.unsupported = True

104
test/Transforms/LoopIdiom/R600/popcnt.ll Normal file
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@ -0,0 +1,104 @@
; RUN: opt -loop-idiom -mtriple=r600-- -mcpu=SI -S < %s | FileCheck %s
; Mostly copied from x86 version.
;To recognize this pattern:
;int popcount(unsigned long long a) {
; int c = 0;
; while (a) {
; c++;
; a &= a - 1;
; }
; return c;
;}
;
; CHECK-LABEL: @popcount_i64
; CHECK: entry
; CHECK: llvm.ctpop.i64
; CHECK: ret
define i32 @popcount_i64(i64 %a) nounwind uwtable readnone ssp {
entry:
%tobool3 = icmp eq i64 %a, 0
br i1 %tobool3, label %while.end, label %while.body
while.body: ; preds = %entry, %while.body
%c.05 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
%a.addr.04 = phi i64 [ %and, %while.body ], [ %a, %entry ]
%inc = add nsw i32 %c.05, 1
%sub = add i64 %a.addr.04, -1
%and = and i64 %sub, %a.addr.04
%tobool = icmp eq i64 %and, 0
br i1 %tobool, label %while.end, label %while.body
while.end: ; preds = %while.body, %entry
%c.0.lcssa = phi i32 [ 0, %entry ], [ %inc, %while.body ]
ret i32 %c.0.lcssa
}
; CHECK-LABEL: @popcount_i32
; CHECK: entry
; CHECK: llvm.ctpop.i32
; CHECK: ret
define i32 @popcount_i32(i32 %a) nounwind uwtable readnone ssp {
entry:
%tobool3 = icmp eq i32 %a, 0
br i1 %tobool3, label %while.end, label %while.body
while.body: ; preds = %entry, %while.body
%c.05 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
%a.addr.04 = phi i32 [ %and, %while.body ], [ %a, %entry ]
%inc = add nsw i32 %c.05, 1
%sub = add i32 %a.addr.04, -1
%and = and i32 %sub, %a.addr.04
%tobool = icmp eq i32 %and, 0
br i1 %tobool, label %while.end, label %while.body
while.end: ; preds = %while.body, %entry
%c.0.lcssa = phi i32 [ 0, %entry ], [ %inc, %while.body ]
ret i32 %c.0.lcssa
}
; To recognize this pattern:
;int popcount(unsigned long long a, int mydata1, int mydata2) {
; int c = 0;
; while (a) {
; c++;
; a &= a - 1;
; mydata1 *= c;
; mydata2 *= (int)a;
; }
; return c + mydata1 + mydata2;
;}
; CHECK-LABEL: @popcount2
; CHECK: entry
; CHECK: llvm.ctpop.i64
; CHECK: ret
define i32 @popcount2(i64 %a, i32 %mydata1, i32 %mydata2) nounwind uwtable readnone ssp {
entry:
%tobool9 = icmp eq i64 %a, 0
br i1 %tobool9, label %while.end, label %while.body
while.body: ; preds = %entry, %while.body
%c.013 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
%mydata2.addr.012 = phi i32 [ %mul1, %while.body ], [ %mydata2, %entry ]
%mydata1.addr.011 = phi i32 [ %mul, %while.body ], [ %mydata1, %entry ]
%a.addr.010 = phi i64 [ %and, %while.body ], [ %a, %entry ]
%inc = add nsw i32 %c.013, 1
%sub = add i64 %a.addr.010, -1
%and = and i64 %sub, %a.addr.010
%mul = mul nsw i32 %inc, %mydata1.addr.011
%conv = trunc i64 %and to i32
%mul1 = mul nsw i32 %conv, %mydata2.addr.012
%tobool = icmp eq i64 %and, 0
br i1 %tobool, label %while.end, label %while.body
while.end: ; preds = %while.body, %entry
%c.0.lcssa = phi i32 [ 0, %entry ], [ %inc, %while.body ]
%mydata2.addr.0.lcssa = phi i32 [ %mydata2, %entry ], [ %mul1, %while.body ]
%mydata1.addr.0.lcssa = phi i32 [ %mydata1, %entry ], [ %mul, %while.body ]
%add = add i32 %mydata2.addr.0.lcssa, %mydata1.addr.0.lcssa
%add2 = add i32 %add, %c.0.lcssa
ret i32 %add2
}