mirror of
https://github.com/c64scene-ar/llvm-6502.git
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07525a6be6
type coercion code, especially when targetting ARM. Things like [1 x i32] instead of i32 are very common there. The goal of this logic is to ensure that when we are picking an alloca type, we look through such wrapper aggregates and across any zero-length aggregate elements to find the simplest type possible to form a type partition. This logic should (generally speaking) rarely fire. It only ends up kicking in when an alloca is accessed using two different types (for instance, i32 and float), and the underlying alloca type has wrapper aggregates around it. I noticed a significant amount of this occurring looking at stepanov_abstraction generated code for arm, and suspect it happens elsewhere as well. Note that this doesn't yet address truly heinous IR productions such as PR14059 is concerning. Those result in mismatched *sizes* of types in addition to mismatched access and alloca types. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165870 91177308-0d34-0410-b5e6-96231b3b80d8
172 lines
5.8 KiB
LLVM
172 lines
5.8 KiB
LLVM
; RUN: opt < %s -sroa -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
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define void @test1({ i8, i8 }* %a, { i8, i8 }* %b) {
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; CHECK: @test1
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; CHECK: %[[gep_a0:.*]] = getelementptr inbounds { i8, i8 }* %a, i64 0, i32 0
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; CHECK: %[[a0:.*]] = load i8* %[[gep_a0]], align 16
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; CHECK: %[[gep_a1:.*]] = getelementptr inbounds { i8, i8 }* %a, i64 0, i32 1
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; CHECK: %[[a1:.*]] = load i8* %[[gep_a1]], align 1
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; CHECK: %[[gep_b0:.*]] = getelementptr inbounds { i8, i8 }* %b, i64 0, i32 0
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; CHECK: store i8 %[[a0]], i8* %[[gep_b0]], align 16
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; CHECK: %[[gep_b1:.*]] = getelementptr inbounds { i8, i8 }* %b, i64 0, i32 1
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; CHECK: store i8 %[[a1]], i8* %[[gep_b1]], align 1
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; CHECK: ret void
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entry:
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%alloca = alloca { i8, i8 }, align 16
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%gep_a = getelementptr { i8, i8 }* %a, i32 0, i32 0
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%gep_alloca = getelementptr { i8, i8 }* %alloca, i32 0, i32 0
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%gep_b = getelementptr { i8, i8 }* %b, i32 0, i32 0
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store i8 420, i8* %gep_alloca, align 16
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %gep_alloca, i8* %gep_a, i32 2, i32 16, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %gep_b, i8* %gep_alloca, i32 2, i32 16, i1 false)
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ret void
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}
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define void @test2() {
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; CHECK: @test2
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; CHECK: alloca i16
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; CHECK: load i8* %{{.*}}
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; CHECK: store i8 42, i8* %{{.*}}
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; CHECK: ret void
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entry:
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%a = alloca { i8, i8, i8, i8 }, align 2
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%gep1 = getelementptr { i8, i8, i8, i8 }* %a, i32 0, i32 1
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%cast1 = bitcast i8* %gep1 to i16*
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store volatile i16 0, i16* %cast1
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%gep2 = getelementptr { i8, i8, i8, i8 }* %a, i32 0, i32 2
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%result = load i8* %gep2
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store i8 42, i8* %gep2
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ret void
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}
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define void @PR13920(<2 x i64>* %a, i16* %b) {
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; Test that alignments on memcpy intrinsics get propagated to loads and stores.
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; CHECK: @PR13920
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; CHECK: load <2 x i64>* %a, align 2
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; CHECK: store <2 x i64> {{.*}}, <2 x i64>* {{.*}}, align 2
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; CHECK: ret void
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entry:
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%aa = alloca <2 x i64>, align 16
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%aptr = bitcast <2 x i64>* %a to i8*
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%aaptr = bitcast <2 x i64>* %aa to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %aaptr, i8* %aptr, i32 16, i32 2, i1 false)
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%bptr = bitcast i16* %b to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %bptr, i8* %aaptr, i32 16, i32 2, i1 false)
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ret void
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}
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define void @test3(i8* %x) {
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; Test that when we promote an alloca to a type with lower ABI alignment, we
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; provide the needed explicit alignment that code using the alloca may be
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; expecting. However, also check that any offset within an alloca can in turn
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; reduce the alignment.
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; CHECK: @test3
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; CHECK: alloca [22 x i8], align 8
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; CHECK: alloca [18 x i8], align 2
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; CHECK: ret void
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entry:
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%a = alloca { i8*, i8*, i8* }
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%b = alloca { i8*, i8*, i8* }
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%a_raw = bitcast { i8*, i8*, i8* }* %a to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a_raw, i8* %x, i32 22, i32 8, i1 false)
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%b_raw = bitcast { i8*, i8*, i8* }* %b to i8*
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%b_gep = getelementptr i8* %b_raw, i32 6
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %b_gep, i8* %x, i32 18, i32 2, i1 false)
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ret void
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}
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define void @test5() {
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; Test that we preserve underaligned loads and stores when splitting.
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; CHECK: @test5
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; CHECK: alloca [9 x i8]
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; CHECK: alloca [9 x i8]
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; CHECK: store volatile double 0.0{{.*}}, double* %{{.*}}, align 1
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; CHECK: load i16* %{{.*}}, align 1
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; CHECK: load double* %{{.*}}, align 1
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; CHECK: store volatile double %{{.*}}, double* %{{.*}}, align 1
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; CHECK: load i16* %{{.*}}, align 1
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; CHECK: ret void
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entry:
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%a = alloca [18 x i8]
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%raw1 = getelementptr inbounds [18 x i8]* %a, i32 0, i32 0
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%ptr1 = bitcast i8* %raw1 to double*
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store volatile double 0.0, double* %ptr1, align 1
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%weird_gep1 = getelementptr inbounds [18 x i8]* %a, i32 0, i32 7
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%weird_cast1 = bitcast i8* %weird_gep1 to i16*
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%weird_load1 = load i16* %weird_cast1, align 1
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%raw2 = getelementptr inbounds [18 x i8]* %a, i32 0, i32 9
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%ptr2 = bitcast i8* %raw2 to double*
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%d1 = load double* %ptr1, align 1
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store volatile double %d1, double* %ptr2, align 1
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%weird_gep2 = getelementptr inbounds [18 x i8]* %a, i32 0, i32 16
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%weird_cast2 = bitcast i8* %weird_gep2 to i16*
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%weird_load2 = load i16* %weird_cast2, align 1
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ret void
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}
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define void @test6() {
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; Test that we promote alignment when the underlying alloca switches to one
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; that innately provides it.
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; CHECK: @test6
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; CHECK: alloca double
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; CHECK: alloca double
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; CHECK-NOT: align
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; CHECK: ret void
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entry:
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%a = alloca [16 x i8]
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%raw1 = getelementptr inbounds [16 x i8]* %a, i32 0, i32 0
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%ptr1 = bitcast i8* %raw1 to double*
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store volatile double 0.0, double* %ptr1, align 1
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%raw2 = getelementptr inbounds [16 x i8]* %a, i32 0, i32 8
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%ptr2 = bitcast i8* %raw2 to double*
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%val = load double* %ptr1, align 1
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store volatile double %val, double* %ptr2, align 1
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ret void
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}
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define void @test7(i8* %out) {
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; Test that we properly compute the destination alignment when rewriting
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; memcpys as direct loads or stores.
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; CHECK: @test7
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; CHECK-NOT: alloca
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entry:
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%a = alloca [16 x i8]
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%raw1 = getelementptr inbounds [16 x i8]* %a, i32 0, i32 0
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%ptr1 = bitcast i8* %raw1 to double*
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%raw2 = getelementptr inbounds [16 x i8]* %a, i32 0, i32 8
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%ptr2 = bitcast i8* %raw2 to double*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %raw1, i8* %out, i32 16, i32 0, i1 false)
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; CHECK: %[[val2:.*]] = load double* %{{.*}}, align 1
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; CHECK: %[[val1:.*]] = load double* %{{.*}}, align 1
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%val1 = load double* %ptr2, align 1
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%val2 = load double* %ptr1, align 1
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store double %val1, double* %ptr1, align 1
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store double %val2, double* %ptr2, align 1
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %out, i8* %raw1, i32 16, i32 0, i1 false)
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; CHECK: store double %[[val1]], double* %{{.*}}, align 1
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; CHECK: store double %[[val2]], double* %{{.*}}, align 1
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ret void
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; CHECK: ret void
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}
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