mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 19:52:54 +01:00
[PPC] Use SeparateConstOffsetFromGEP
This mirrors r222331, which enabled SeparateConstOffsetFromGEP on AArch64, in the PowerPC backend. Yields, on a POWER7 machine, a 30% speedup on SingleSource/Benchmarks/Shootout/nestedloop (this might just be from LICM, there is a store moved out of the inner loop) and a potential speedup on MultiSource/Benchmarks/mediabench/mpeg2/mpeg2dec/mpeg2decode. Regardless, it makes some code look cleaner, and synchronizing the backends in this regard seems like a generally good thing. llvm-svn: 222504
This commit is contained in:
Hal Finkel
parent
df554c2abd
commit
ac26448a5c
@ -22,6 +22,7 @@
|
||||
#include "llvm/Support/FormattedStream.h"
|
||||
#include "llvm/Support/TargetRegistry.h"
|
||||
#include "llvm/Target/TargetOptions.h"
|
||||
#include "llvm/Transforms/Scalar.h"
|
||||
using namespace llvm;
|
||||
|
||||
static cl::
|
||||
@ -32,6 +33,11 @@ static cl::opt<bool>
|
||||
VSXFMAMutateEarly("schedule-ppc-vsx-fma-mutation-early",
|
||||
cl::Hidden, cl::desc("Schedule VSX FMA instruction mutation early"));
|
||||
|
||||
static cl::opt<bool>
|
||||
EnableGEPOpt("ppc-gep-opt", cl::Hidden,
|
||||
cl::desc("Enable optimizations on complex GEPs"),
|
||||
cl::init(true));
|
||||
|
||||
extern "C" void LLVMInitializePowerPCTarget() {
|
||||
// Register the targets
|
||||
RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
|
||||
@ -168,6 +174,20 @@ TargetPassConfig *PPCTargetMachine::createPassConfig(PassManagerBase &PM) {
|
||||
|
||||
void PPCPassConfig::addIRPasses() {
|
||||
addPass(createAtomicExpandPass(&getPPCTargetMachine()));
|
||||
|
||||
if (TM->getOptLevel() == CodeGenOpt::Aggressive && EnableGEPOpt) {
|
||||
// Call SeparateConstOffsetFromGEP pass to extract constants within indices
|
||||
// and lower a GEP with multiple indices to either arithmetic operations or
|
||||
// multiple GEPs with single index.
|
||||
addPass(createSeparateConstOffsetFromGEPPass(TM, true));
|
||||
// Call EarlyCSE pass to find and remove subexpressions in the lowered
|
||||
// result.
|
||||
addPass(createEarlyCSEPass());
|
||||
// Do loop invariant code motion in case part of the lowered result is
|
||||
// invariant.
|
||||
addPass(createLICMPass());
|
||||
}
|
||||
|
||||
TargetPassConfig::addIRPasses();
|
||||
}
|
||||
|
||||
|
||||
157
test/CodeGen/PowerPC/ppc64-gep-opt.ll
Normal file
157
test/CodeGen/PowerPC/ppc64-gep-opt.ll
Normal file
@ -0,0 +1,157 @@
|
||||
; RUN: llc -O3 -mcpu=pwr7 < %s | FileCheck %s
|
||||
; RUN: llc -O3 -print-after=codegenprepare -mcpu=ppc64 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
|
||||
; RUN: llc -O3 -print-after=codegenprepare -mcpu=pwr7 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
|
||||
target datalayout = "E-m:e-i64:64-n32:64"
|
||||
target triple = "powerpc64-unknown-linux-gnu"
|
||||
|
||||
; Following test cases test enabling SeparateConstOffsetFromGEP pass in the PPC
|
||||
; backend. If useAA() returns true, it will lower a GEP with multiple indices
|
||||
; into GEPs with a single index, otherwise it will lower it into a
|
||||
; "ptrtoint+arithmetics+inttoptr" form.
|
||||
|
||||
%struct = type { i32, i32, i32, i32, [20 x i32] }
|
||||
|
||||
; Check that when two complex GEPs are used in two basic blocks, LLVM can
|
||||
; elimilate the common subexpression for the second use.
|
||||
define void @test_GEP_CSE([240 x %struct]* %string, i32* %adj, i32 %lib, i64 %idxprom) {
|
||||
%liberties = getelementptr [240 x %struct]* %string, i64 1, i64 %idxprom, i32 3
|
||||
%1 = load i32* %liberties, align 4
|
||||
%cmp = icmp eq i32 %1, %lib
|
||||
br i1 %cmp, label %if.then, label %if.end
|
||||
|
||||
if.then: ; preds = %entry
|
||||
%origin = getelementptr [240 x %struct]* %string, i64 1, i64 %idxprom, i32 2
|
||||
%2 = load i32* %origin, align 4
|
||||
store i32 %2, i32* %adj, align 4
|
||||
br label %if.end
|
||||
|
||||
if.end: ; preds = %if.then, %entry
|
||||
ret void
|
||||
}
|
||||
|
||||
; CHECK-NoAA-LABEL: @test_GEP_CSE(
|
||||
; CHECK-NoAA: [[PTR0:%[a-zA-Z0-9]+]] = ptrtoint [240 x %struct]* %string to i64
|
||||
; CHECK-NoAA: [[PTR1:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
|
||||
; CHECK-NoAA: [[PTR2:%[a-zA-Z0-9]+]] = add i64 [[PTR0]], [[PTR1]]
|
||||
; CHECK-NoAA: add i64 [[PTR2]], 23052
|
||||
; CHECK-NoAA: inttoptr
|
||||
; CHECK-NoAA: if.then:
|
||||
; CHECK-NoAA-NOT: ptrtoint
|
||||
; CHECK-NoAA-NOT: mul
|
||||
; CHECK-NoAA: add i64 [[PTR2]], 23048
|
||||
; CHECK-NoAA: inttoptr
|
||||
|
||||
; CHECK-UseAA-LABEL: @test_GEP_CSE(
|
||||
; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = bitcast [240 x %struct]* %string to i8*
|
||||
; CHECK-UseAA: [[IDX:%[a-zA-Z0-9]+]] = mul i64 %idxprom, 96
|
||||
; CHECK-UseAA: [[PTR1:%[a-zA-Z0-9]+]] = getelementptr i8* [[PTR0]], i64 [[IDX]]
|
||||
; CHECK-UseAA: getelementptr i8* [[PTR1]], i64 23052
|
||||
; CHECK-UseAA: bitcast
|
||||
; CHECK-UseAA: if.then:
|
||||
; CHECK-UseAA: getelementptr i8* [[PTR1]], i64 23048
|
||||
; CHECK-UseAA: bitcast
|
||||
|
||||
%class.my = type { i32, [128 x i32], i32, [256 x %struct.pt]}
|
||||
%struct.pt = type { %struct.point*, i32, i32 }
|
||||
%struct.point = type { i32, i32 }
|
||||
|
||||
; Check when a GEP is used across two basic block, LLVM can sink the address
|
||||
; calculation and code gen can generate a better addressing mode for the second
|
||||
; use.
|
||||
define void @test_GEP_across_BB(%class.my* %this, i64 %idx) {
|
||||
%1 = getelementptr %class.my* %this, i64 0, i32 3, i64 %idx, i32 1
|
||||
%2 = load i32* %1, align 4
|
||||
%3 = getelementptr %class.my* %this, i64 0, i32 3, i64 %idx, i32 2
|
||||
%4 = load i32* %3, align 4
|
||||
%5 = icmp eq i32 %2, %4
|
||||
br i1 %5, label %if.true, label %exit
|
||||
|
||||
if.true:
|
||||
%6 = shl i32 %4, 1
|
||||
store i32 %6, i32* %3, align 4
|
||||
br label %exit
|
||||
|
||||
exit:
|
||||
%7 = add nsw i32 %4, 1
|
||||
store i32 %7, i32* %1, align 4
|
||||
ret void
|
||||
}
|
||||
; CHECK-LABEL: test_GEP_across_BB:
|
||||
; CHECK-NOT: lwzu
|
||||
; CHECK: blr
|
||||
|
||||
; CHECK-NoAA-LABEL: test_GEP_across_BB(
|
||||
; CHECK-NoAA: add i64 [[TMP:%[a-zA-Z0-9]+]], 528
|
||||
; CHECK-NoAA: add i64 [[TMP]], 532
|
||||
; CHECK-NoAA: if.true:
|
||||
; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = add i64 [[TMP]], 532
|
||||
; CHECK-NoAA: exit:
|
||||
; CHECK-NoAA: {{%sunk[a-zA-Z0-9]+}} = add i64 [[TMP]], 528
|
||||
|
||||
; CHECK-UseAA-LABEL: test_GEP_across_BB(
|
||||
; CHECK-UseAA: [[PTR0:%[a-zA-Z0-9]+]] = getelementptr
|
||||
; CHECK-UseAA: getelementptr i8* [[PTR0]], i64 528
|
||||
; CHECK-UseAA: getelementptr i8* [[PTR0]], i64 532
|
||||
; CHECK-UseAA: if.true:
|
||||
; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8* [[PTR0]], i64 532
|
||||
; CHECK-UseAA: exit:
|
||||
; CHECK-UseAA: {{%sunk[a-zA-Z0-9]+}} = getelementptr i8* [[PTR0]], i64 528
|
||||
|
||||
%struct.S = type { float, double }
|
||||
@struct_array = global [1024 x %struct.S] zeroinitializer, align 16
|
||||
|
||||
; The following two test cases check we can extract constant from indices of
|
||||
; struct type.
|
||||
; The constant offsets are from indices "i64 %idxprom" and "i32 1". As the
|
||||
; alloca size of %struct.S is 16, and "i32 1" is the 2rd element whose field
|
||||
; offset is 8, the total constant offset is (5 * 16 + 8) = 88.
|
||||
define double* @test-struct_1(i32 %i) {
|
||||
entry:
|
||||
%add = add nsw i32 %i, 5
|
||||
%idxprom = sext i32 %add to i64
|
||||
%p = getelementptr [1024 x %struct.S]* @struct_array, i64 0, i64 %idxprom, i32 1
|
||||
ret double* %p
|
||||
}
|
||||
; CHECK-NoAA-LABEL: @test-struct_1(
|
||||
; CHECK-NoAA-NOT: getelementptr
|
||||
; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, 88
|
||||
|
||||
; CHECK-UseAA-LABEL: @test-struct_1(
|
||||
; CHECK-UseAA: getelementptr i8* %{{[a-zA-Z0-9]+}}, i64 88
|
||||
|
||||
%struct3 = type { i64, i32 }
|
||||
%struct2 = type { %struct3, i32 }
|
||||
%struct1 = type { i64, %struct2 }
|
||||
%struct0 = type { i32, i32, i64*, [100 x %struct1] }
|
||||
|
||||
; The constant offsets are from indices "i32 3", "i64 %arrayidx" and "i32 1".
|
||||
; "i32 3" is the 4th element whose field offset is 16. The alloca size of
|
||||
; %struct1 is 32. "i32 1" is the 2rd element whose field offset is 8. So the
|
||||
; total constant offset is 16 + (-2 * 32) + 8 = -40
|
||||
define %struct2* @test-struct_2(%struct0* %ptr, i64 %idx) {
|
||||
entry:
|
||||
%arrayidx = add nsw i64 %idx, -2
|
||||
%ptr2 = getelementptr %struct0* %ptr, i64 0, i32 3, i64 %arrayidx, i32 1
|
||||
ret %struct2* %ptr2
|
||||
}
|
||||
; CHECK-NoAA-LABEL: @test-struct_2(
|
||||
; CHECK-NoAA-NOT: = getelementptr
|
||||
; CHECK-NoAA: add i64 %{{[a-zA-Z0-9]+}}, -40
|
||||
|
||||
; CHECK-UseAA-LABEL: @test-struct_2(
|
||||
; CHECK-UseAA: getelementptr i8* %{{[a-zA-Z0-9]+}}, i64 -40
|
||||
|
||||
; Test that when a index is added from two constant, SeparateConstOffsetFromGEP
|
||||
; pass does not generate incorrect result.
|
||||
define void @test_const_add([3 x i32]* %in) {
|
||||
%inc = add nsw i32 2, 1
|
||||
%idxprom = sext i32 %inc to i64
|
||||
%arrayidx = getelementptr [3 x i32]* %in, i64 %idxprom, i64 2
|
||||
store i32 0, i32* %arrayidx, align 4
|
||||
ret void
|
||||
}
|
||||
; CHECK-LABEL: test_const_add:
|
||||
; CHECK: li [[REG:[0-9]+]], 0
|
||||
; CHECK: stw [[REG]], 44(3)
|
||||
; CHECK: blr
|
||||
|
||||
Loading…
Reference in New Issue
Block a user