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https://github.com/c64scene-ar/llvm-6502.git
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db9fed93fa
This is the same optimization of r219233 with modifications to support PHIs with multiple incoming edges from the same block and a test to check that this condition is handled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219656 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
897 B
LLVM
41 lines
897 B
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; a, b;
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; fn1() {
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; if (b)
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; if (a == 0 || a == 5)
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; return a;
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; return 0;
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; }
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; Checking that we handle correctly the case when we have a switch
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; branching multiple times to the same block
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@b = common global i32 0, align 4
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@a = common global i32 0, align 4
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; Function Attrs: nounwind
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define i32 @fn1() {
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; CHECK-LABEL: @fn1
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; CHECK: %switch.selectcmp1 = icmp eq i32 %1, 5
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; CHECK: %switch.select2 = select i1 %switch.selectcmp1, i32 5, i32 %switch.select
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entry:
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%0 = load i32* @b, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %if.end3, label %if.then
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if.then:
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%1 = load i32* @a, align 4
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switch i32 %1, label %if.end3 [
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i32 5, label %return
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i32 0, label %return
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]
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if.end3:
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br label %return
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return:
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%retval.0 = phi i32 [ 0, %if.end3 ], [ %1, %if.then ], [ %1, %if.then ]
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ret i32 %retval.0
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}
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