mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 20:29:48 +00:00
8db9fbf7cd
SeparateConstOffsetFromGEP can gives more optimizaiton opportunities related to GEPs, which benefits EarlyCSE and LICM. By enabling these passes we can have better address calculations and generate a better addressing mode. Some SPEC 2006 benchmarks (astar, gobmk, namd) have obvious improvements on Cortex-A57. Reviewed in http://reviews.llvm.org/D5864. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222331 91177308-0d34-0410-b5e6-96231b3b80d8
164 lines
6.1 KiB
LLVM
164 lines
6.1 KiB
LLVM
; RUN: llc -O3 -verify-machineinstrs %s -o - | FileCheck %s
|
|
; RUN: llc -O3 -print-after=codegenprepare -mcpu=cyclone < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-NoAA <%t %s
|
|
; RUN: llc -O3 -print-after=codegenprepare -mcpu=cortex-a53 < %s >%t 2>&1 && FileCheck --check-prefix=CHECK-UseAA <%t %s
|
|
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
|
|
target triple = "aarch64-linux-gnueabi"
|
|
|
|
; Following test cases test enabling SeparateConstOffsetFromGEP pass in AArch64
|
|
; 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-LABEL: test_GEP_CSE:
|
|
; CHECK: madd
|
|
; CHECK: ldr
|
|
; CHECK-NOT: madd
|
|
; CHECK:ldr
|
|
|
|
; 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: ldr {{w[0-9]+}}, [{{x[0-9]+}}, #528]
|
|
; CHECK: ldr {{w[0-9]+}}, [{{x[0-9]+}}, #532]
|
|
; CHECK-NOT: add
|
|
; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #532]
|
|
; CHECK: str {{w[0-9]+}}, [{{x[0-9]+}}, #528]
|
|
|
|
; 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: str wzr, [x0, #44]
|