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ba92818a1d
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. llvm-svn: 219656
73 lines
1.4 KiB
LLVM
73 lines
1.4 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; int foo1_with_default(int a) {
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; switch(a) {
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; case 10:
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; return 10;
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; case 20:
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; return 2;
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; }
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; return 4;
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; }
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define i32 @foo1_with_default(i32 %a) {
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; CHECK-LABEL: @foo1_with_default
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; CHECK: %switch.selectcmp = icmp eq i32 %a, 20
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; CHECK-NEXT: %switch.select = select i1 %switch.selectcmp, i32 2, i32 4
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; CHECK-NEXT: %switch.selectcmp1 = icmp eq i32 %a, 10
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; CHECK-NEXT: %switch.select2 = select i1 %switch.selectcmp1, i32 10, i32 %switch.select
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entry:
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switch i32 %a, label %sw.epilog [
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i32 10, label %sw.bb
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i32 20, label %sw.bb1
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]
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sw.bb:
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br label %return
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sw.bb1:
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br label %return
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sw.epilog:
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br label %return
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return:
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%retval.0 = phi i32 [ 4, %sw.epilog ], [ 2, %sw.bb1 ], [ 10, %sw.bb ]
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ret i32 %retval.0
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}
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; int foo1_without_default(int a) {
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; switch(a) {
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; case 10:
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; return 10;
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; case 20:
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; return 2;
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; }
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; __builtin_unreachable();
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; }
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define i32 @foo1_without_default(i32 %a) {
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; CHECK-LABEL: @foo1_without_default
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; CHECK: %switch.selectcmp = icmp eq i32 %a, 10
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; CHECK-NEXT: %switch.select = select i1 %switch.selectcmp, i32 10, i32 2
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; CHECK-NOT: %switch.selectcmp1
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entry:
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switch i32 %a, label %sw.epilog [
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i32 10, label %sw.bb
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i32 20, label %sw.bb1
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]
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sw.bb:
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br label %return
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sw.bb1:
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br label %return
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sw.epilog:
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unreachable
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return:
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%retval.0 = phi i32 [ 2, %sw.bb1 ], [ 10, %sw.bb ]
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ret i32 %retval.0
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}
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