67a58fa3a6
Even if there are no interesting functions, the SCCP solver would still run before bailing. Now bail earlier, avoid running the solver for nothing. Differential Revision: https://reviews.llvm.org/D111645
52 lines
1.6 KiB
LLVM
52 lines
1.6 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -function-specialization -debug -S < %s 2>&1 | FileCheck %s
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; The purpose of this test is to check that we don't run the solver as there's
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; nothing to do here. For a test that doesn't trigger function specialisation,
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; it is intentionally 'big' because we also want to check that the ssa.copy
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; intrinsics that are introduced by the solver are cleaned up if we bail
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; early. Thus, first check the debug messages for the introduction of these
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; intrinsics:
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; CHECK: FnSpecialization: Analysing decl: foo
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; CHECK: Found replacement{{.*}} call i32 @llvm.ssa.copy.i32
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; CHECK: Found replacement{{.*}} call i32 @llvm.ssa.copy.i32
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; Then, make sure the solver didn't run:
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; CHECK-NOT: Running solver
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; Finally, check the absence and thus removal of these intrinsics:
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; CHECK-LABEL: @foo
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; CHECK-NOT: call i32 @llvm.ssa.copy.i32
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@N = external dso_local global i32, align 4
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@B = external dso_local global i32*, align 8
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@A = external dso_local global i32*, align 8
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define dso_local i32 @foo() {
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entry:
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br label %for.cond
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for.cond:
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%0 = load i32, i32* @N, align 4
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%cmp = icmp slt i32 %i.0, %0
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br i1 %cmp, label %for.body, label %for.cond.cleanup
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for.cond.cleanup:
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ret i32 undef
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for.body:
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%1 = load i32*, i32** @B, align 8
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%idxprom = sext i32 %i.0 to i64
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%arrayidx = getelementptr inbounds i32, i32* %1, i64 %idxprom
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%2 = load i32, i32* %arrayidx, align 4
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%3 = load i32*, i32** @A, align 8
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%arrayidx2 = getelementptr inbounds i32, i32* %3, i64 %idxprom
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store i32 %2, i32* %arrayidx2, align 4
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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}
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