derek.holloway
7502bf64a4
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144 lines
3.2 KiB
LLVM
144 lines
3.2 KiB
LLVM
; RUN: opt -S -passes='dxil-legalize' -mtriple=dxil-pc-shadermodel6.3-library %s | FileCheck %s
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; Test that a switch with an unreachable default and a common successor across
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; all case blocks has its default redirected to the common successor.
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define i32 @test_common_successor(i32 %val) {
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; CHECK-LABEL: define i32 @test_common_successor(
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; CHECK: entry:
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; CHECK-NEXT: switch i32 %val, label %merge [
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; CHECK-NEXT: i32 0, label %case0
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; CHECK-NEXT: i32 1, label %case1
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; CHECK-NEXT: i32 2, label %case2
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; CHECK-NEXT: ]
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; CHECK: case0:
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; CHECK-NEXT: br label %merge
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; CHECK: case1:
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; CHECK-NEXT: br label %merge
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; CHECK: case2:
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; CHECK-NEXT: br label %merge
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; CHECK: merge:
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; CHECK-NEXT: %result = phi i32 [ 10, %case0 ], [ 20, %case1 ], [ 30, %case2 ], [ poison, %entry ]
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; CHECK-NEXT: ret i32 %result
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;
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entry:
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switch i32 %val, label %default [
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i32 0, label %case0
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i32 1, label %case1
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i32 2, label %case2
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]
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default:
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unreachable
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case0:
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br label %merge
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case1:
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br label %merge
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case2:
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br label %merge
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merge:
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%result = phi i32 [ 10, %case0 ], [ 20, %case1 ], [ 30, %case2 ]
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ret i32 %result
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}
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; Test that a switch with an unreachable default and no common successor
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; has its default redirected to the first case block.
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define i32 @test_no_common_successor(i32 %val) {
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; CHECK-LABEL: define i32 @test_no_common_successor(
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; CHECK: entry:
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; CHECK-NEXT: switch i32 %val, label %case0 [
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; CHECK-NEXT: i32 0, label %case0
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; CHECK-NEXT: i32 1, label %case1
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; CHECK-NEXT: ]
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; CHECK: case0:
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; CHECK-NEXT: ret i32 10
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; CHECK: case1:
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; CHECK-NEXT: ret i32 20
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;
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entry:
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switch i32 %val, label %default [
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i32 0, label %case0
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i32 1, label %case1
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]
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default:
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unreachable
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case0:
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ret i32 10
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case1:
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ret i32 20
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}
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; Test that a switch with a reachable default is not modified.
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define i32 @test_reachable_default(i32 %val) {
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; CHECK-LABEL: define i32 @test_reachable_default(
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; CHECK: entry:
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; CHECK-NEXT: switch i32 %val, label %default [
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; CHECK-NEXT: i32 0, label %case0
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; CHECK-NEXT: ]
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; CHECK: default:
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; CHECK-NEXT: ret i32 -1
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; CHECK: case0:
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; CHECK-NEXT: ret i32 10
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;
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entry:
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switch i32 %val, label %default [
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i32 0, label %case0
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]
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default:
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ret i32 -1
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case0:
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ret i32 10
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}
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; Test with conditional branches in case blocks (no common successor) and
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; the default falling back to first case.
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define i32 @test_conditional_case_blocks(i32 %val, i1 %cond) {
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; CHECK-LABEL: define i32 @test_conditional_case_blocks(
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; CHECK: entry:
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; CHECK-NEXT: switch i32 %val, label %case0 [
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; CHECK-NEXT: i32 0, label %case0
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; CHECK-NEXT: i32 1, label %case1
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; CHECK-NEXT: ]
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; CHECK: case0:
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; CHECK-NEXT: br i1 %cond, label %merge_a, label %merge_b
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; CHECK: case1:
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; CHECK-NEXT: br label %merge_a
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; CHECK: merge_a:
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; CHECK-NEXT: ret i32 1
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; CHECK: merge_b:
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; CHECK-NEXT: ret i32 2
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;
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entry:
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switch i32 %val, label %default [
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i32 0, label %case0
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i32 1, label %case1
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]
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default:
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unreachable
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case0:
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br i1 %cond, label %merge_a, label %merge_b
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case1:
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br label %merge_a
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merge_a:
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ret i32 1
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merge_b:
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ret i32 2
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}
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