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https://github.com/c64scene-ar/llvm-6502.git
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7ec1829823
The bug was introduced in r225282. r225282 assumed that sub X, Y is the same as add X, -Y. This is not correct if we are going to upgrade the sub to sub nuw. This change fixes the issue by making the optimization ignore sub instructions. Differential Revision: http://reviews.llvm.org/D6979 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226075 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
2.4 KiB
LLVM
109 lines
2.4 KiB
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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define i32 @test.signed.add.0(i32* %array, i32 %length, i32 %init) {
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; CHECK-LABEL: @test.signed.add.0
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entry:
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%upper = icmp slt i32 %init, %length
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br i1 %upper, label %loop, label %exit
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loop:
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; CHECK-LABEL: loop
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%civ = phi i32 [ %init, %entry ], [ %civ.inc, %latch ]
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%civ.inc = add i32 %civ, 1
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; CHECK: %civ.inc = add nsw i32 %civ, 1
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%cmp = icmp slt i32 %civ.inc, %length
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br i1 %cmp, label %latch, label %break
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latch:
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store i32 0, i32* %array
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%check = icmp slt i32 %civ.inc, %length
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br i1 %check, label %loop, label %break
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break:
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ret i32 %civ.inc
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exit:
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ret i32 42
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}
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define i32 @test.signed.add.1(i32* %array, i32 %length, i32 %init) {
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; CHECK-LABEL: @test.signed.add.1
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entry:
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%upper = icmp sle i32 %init, %length
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br i1 %upper, label %loop, label %exit
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loop:
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; CHECK-LABEL: loop
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%civ = phi i32 [ %init, %entry ], [ %civ.inc, %latch ]
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%civ.inc = add i32 %civ, 1
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; CHECK: %civ.inc = add i32 %civ, 1
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%cmp = icmp slt i32 %civ.inc, %length
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br i1 %cmp, label %latch, label %break
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latch:
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store i32 0, i32* %array
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%check = icmp slt i32 %civ.inc, %length
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br i1 %check, label %loop, label %break
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break:
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ret i32 %civ.inc
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exit:
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ret i32 42
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}
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define i32 @test.unsigned.add.0(i32* %array, i32 %length, i32 %init) {
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; CHECK-LABEL: @test.unsigned.add.0
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entry:
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%upper = icmp ult i32 %init, %length
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br i1 %upper, label %loop, label %exit
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loop:
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; CHECK-LABEL: loop
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%civ = phi i32 [ %init, %entry ], [ %civ.inc, %latch ]
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%civ.inc = add i32 %civ, 1
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; CHECK: %civ.inc = add nuw i32 %civ, 1
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%cmp = icmp slt i32 %civ.inc, %length
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br i1 %cmp, label %latch, label %break
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latch:
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store i32 0, i32* %array
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%check = icmp ult i32 %civ.inc, %length
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br i1 %check, label %loop, label %break
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break:
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ret i32 %civ.inc
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exit:
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ret i32 42
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}
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define i32 @test.unsigned.add.1(i32* %array, i32 %length, i32 %init) {
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; CHECK-LABEL: @test.unsigned.add.1
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entry:
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%upper = icmp ule i32 %init, %length
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br i1 %upper, label %loop, label %exit
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loop:
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; CHECK-LABEL: loop
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%civ = phi i32 [ %init, %entry ], [ %civ.inc, %latch ]
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%civ.inc = add i32 %civ, 1
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; CHECK: %civ.inc = add i32 %civ, 1
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%cmp = icmp slt i32 %civ.inc, %length
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br i1 %cmp, label %latch, label %break
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latch:
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store i32 0, i32* %array
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%check = icmp ult i32 %civ.inc, %length
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br i1 %check, label %loop, label %break
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break:
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ret i32 %civ.inc
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exit:
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ret i32 42
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}
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!0 = !{i32 0, i32 2}
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!1 = !{i32 0, i32 42}
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