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https://github.com/c64scene-ar/llvm-6502.git
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734d7c2a7e
1. Only run the early (in the module pass pipe) instcombine/simplifycfg if the "unit at a time" passes they are cleaning up after runs. 2. Move the "clean up after the unroller" pass to the very end of the function-level pass pipeline. Loop unroll uses instsimplify now, so it doesn't create a ton of trash. Moving instcombine later allows it to clean up after opportunities are exposed by GVN, DSE, etc. 3. Introduce some phase ordering tests for things that are specifically intended to be simplified by the full optimizer as a whole. This resolves PR2338, and is progress towards PR6627, which will be generating code that looks similar to test2. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130241 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.3 KiB
LLVM
74 lines
2.3 KiB
LLVM
; RUN: opt -O3 -S %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-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.6.7"
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declare i8* @malloc(i64)
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declare void @free(i8*)
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; PR2338
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define void @test1() nounwind ssp {
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%retval = alloca i32, align 4
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%i = alloca i8*, align 8
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%call = call i8* @malloc(i64 1)
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store i8* %call, i8** %i, align 8
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%tmp = load i8** %i, align 8
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store i8 1, i8* %tmp
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%tmp1 = load i8** %i, align 8
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call void @free(i8* %tmp1)
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ret void
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; CHECK: @test1
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; CHECK-NEXT: ret void
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}
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; PR6627 - This whole nasty sequence should be flattened down to a single
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; 32-bit comparison.
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define void @test2(i8* %arrayidx) nounwind ssp {
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entry:
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%xx = bitcast i8* %arrayidx to i32*
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%x1 = load i32* %xx, align 4
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%tmp = trunc i32 %x1 to i8
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%conv = zext i8 %tmp to i32
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%cmp = icmp eq i32 %conv, 127
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br i1 %cmp, label %land.lhs.true, label %if.end
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land.lhs.true: ; preds = %entry
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%arrayidx4 = getelementptr inbounds i8* %arrayidx, i64 1
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%tmp5 = load i8* %arrayidx4, align 1
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%conv6 = zext i8 %tmp5 to i32
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%cmp7 = icmp eq i32 %conv6, 69
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br i1 %cmp7, label %land.lhs.true9, label %if.end
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land.lhs.true9: ; preds = %land.lhs.true
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%arrayidx12 = getelementptr inbounds i8* %arrayidx, i64 2
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%tmp13 = load i8* %arrayidx12, align 1
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%conv14 = zext i8 %tmp13 to i32
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%cmp15 = icmp eq i32 %conv14, 76
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br i1 %cmp15, label %land.lhs.true17, label %if.end
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land.lhs.true17: ; preds = %land.lhs.true9
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%arrayidx20 = getelementptr inbounds i8* %arrayidx, i64 3
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%tmp21 = load i8* %arrayidx20, align 1
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%conv22 = zext i8 %tmp21 to i32
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%cmp23 = icmp eq i32 %conv22, 70
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br i1 %cmp23, label %if.then, label %if.end
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if.then: ; preds = %land.lhs.true17
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%call25 = call i32 (...)* @doo()
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br label %if.end
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if.end: ; preds = %if.then, %land.lhs.true17, %land.lhs.true9, %land.lhs.true, %entry
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ret void
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; CHECK: @test2
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; CHECK: %x1 = load i32* %xx, align 4
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; CHECK-NEXT: icmp eq i32 %x1, 1179403647
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; CHECK-NEXT: br i1 {{.*}}, label %if.then, label %if.end
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}
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declare i32 @doo(...)
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