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71 lines
2.1 KiB
LLVM
71 lines
2.1 KiB
LLVM
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; RUN: opt -S -deadargelim %s | FileCheck %s
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; Case 0: the basic example: an entire aggregate use is returned, but it's
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; actually only used in ways we can eliminate. We gain benefit from analysing
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; the "use" and applying its results to all sub-values.
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; CHECK-LABEL: define internal void @agguse_dead()
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define internal { i32, i32 } @agguse_dead() {
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ret { i32, i32 } { i32 0, i32 1 }
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}
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define internal { i32, i32 } @test_agguse_dead() {
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%val = call { i32, i32 } @agguse_dead()
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ret { i32, i32 } %val
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}
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; Case 1: an opaque use of the aggregate exists (in this case dead). Otherwise
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; only one value is used, so function can be simplified.
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; CHECK-LABEL: define internal i32 @rets_independent_if_agguse_dead()
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; CHECK: [[RET:%.*]] = extractvalue { i32, i32 } { i32 0, i32 1 }, 1
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; CHECK: ret i32 [[RET]]
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define internal { i32, i32 } @rets_independent_if_agguse_dead() {
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ret { i32, i32 } { i32 0, i32 1 }
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}
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define internal { i32, i32 } @test_rets_independent_if_agguse_dead(i1 %tst) {
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%val = call { i32, i32 } @rets_independent_if_agguse_dead()
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br i1 %tst, label %use_1, label %use_aggregate
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use_1:
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; This use can be classified as applying only to ret 1.
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%val0 = extractvalue { i32, i32 } %val, 1
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call void @callee(i32 %val0)
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ret { i32, i32 } undef
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use_aggregate:
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; This use is assumed to apply to both 0 and 1.
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ret { i32, i32 } %val
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}
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; Case 2: an opaque use of the aggregate exists (in this case *live*). Other
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; uses shouldn't matter.
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; CHECK-LABEL: define internal { i32, i32 } @rets_live_agguse()
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; CHECK: ret { i32, i32 } { i32 0, i32 1 }
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define internal { i32, i32 } @rets_live_agguse() {
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ret { i32, i32} { i32 0, i32 1 }
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}
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define { i32, i32 } @test_rets_live_aggues(i1 %tst) {
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%val = call { i32, i32 } @rets_live_agguse()
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br i1 %tst, label %use_1, label %use_aggregate
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use_1:
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; This use can be classified as applying only to ret 1.
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%val0 = extractvalue { i32, i32 } %val, 1
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call void @callee(i32 %val0)
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ret { i32, i32 } undef
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use_aggregate:
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; This use is assumed to apply to both 0 and 1.
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ret { i32, i32 } %val
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}
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declare void @callee(i32)
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