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https://github.com/c64scene-ar/llvm-6502.git
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201d1e56bb
contains "ref". Enhance DSE to use a modref query instead of a store-specific hack to generalize the "ignore may-alias stores" optimization to handle memset and memcpy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120368 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
1.7 KiB
LLVM
71 lines
1.7 KiB
LLVM
; RUN: opt < %s -basicaa -dse -S | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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define void @test1(i32* %Q, i32* %P) {
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%DEAD = load i32* %Q
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store i32 %DEAD, i32* %P
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store i32 0, i32* %P
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ret void
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; CHECK: @test1
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; CHECK-NEXT: store i32 0, i32* %P
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; CHECK-NEXT: ret void
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}
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; PR8576 - Should delete store of 10 even though p/q are may aliases.
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define void @test2(i32 *%p, i32 *%q) {
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store i32 10, i32* %p, align 4
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store i32 20, i32* %q, align 4
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store i32 30, i32* %p, align 4
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ret void
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; CHECK: @test2
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; CHECK-NEXT: store i32 20
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}
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; PR8677
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@g = global i32 1
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define i32 @test3(i32* %g_addr) nounwind {
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; CHECK: @test3
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; CHECK: load i32* %g_addr
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%g_value = load i32* %g_addr, align 4
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store i32 -1, i32* @g, align 4
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store i32 %g_value, i32* %g_addr, align 4
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%tmp3 = load i32* @g, align 4
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ret i32 %tmp3
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}
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define void @test4(i32* %Q) {
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%a = load i32* %Q
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volatile store i32 %a, i32* %Q
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ret void
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; CHECK: @test4
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; CHECK-NEXT: load i32
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; CHECK-NEXT: volatile store
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; CHECK-NEXT: ret void
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}
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define void @test5(i32* %Q) {
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%a = volatile load i32* %Q
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store i32 %a, i32* %Q
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ret void
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; CHECK: @test5
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; CHECK-NEXT: volatile load
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; CHECK-NEXT: ret void
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}
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declare void @llvm.memset.i32(i8*, i8, i32, i32)
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; Should delete store of 10 even though memset is a may-store to P (P and Q may
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; alias).
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define void @test6(i32 *%p, i8 *%q) {
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store i32 10, i32* %p, align 4 ;; dead.
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call void @llvm.memset.i32(i8* %q, i8 42, i32 900, i32 1)
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store i32 30, i32* %p, align 4
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ret void
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; CHECK: @test6
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; CHECK-NEXT: call void @llvm.memset
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}
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