derek.holloway
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71 lines
2.0 KiB
LLVM
71 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -passes=gvn -S < %s | FileCheck %s
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;
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; The Global Value Numbering pass (GVN) propagates boolean values
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; that are constant in dominated basic blocks to all the uses
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; in these basic blocks. However, we don't want the constant propagated
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; into fake.use intrinsics since this would render the intrinsic useless
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; with respect to keeping the variable live up until the fake.use.
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; This test checks that we don't generate any fake.uses with constant 0.
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;
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; Reduced from the following test case, generated with clang -O2 -S -emit-llvm -fextend-variable-liveness test.c
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;
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; extern void func1();
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; extern int bar();
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; extern void baz(int);
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;
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; int foo(int i, float f, int *punused)
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; {
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; int j = 3*i;
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; if (j > 0) {
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; int m = bar(i);
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; if (m) {
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; char b = f;
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; baz(b);
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; if (b)
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; goto lab;
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; func1();
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; }
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; lab:
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; func1();
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; }
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; return 1;
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; }
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;; GVN should propagate a constant value through to a regular call, but not to
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;; a fake use, which should continue to track the original value.
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define i32 @foo(float %f) optdebug {
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; CHECK-LABEL: define i32 @foo(
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; CHECK-SAME: float [[F:%.*]]) #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: [[CONV:%.*]] = fptosi float [[F]] to i8
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; CHECK-NEXT: [[TOBOOL3:%.*]] = icmp eq i8 [[CONV]], 0
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; CHECK-NEXT: br i1 [[TOBOOL3]], label %[[IF_END:.*]], label %[[LAB:.*]]
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; CHECK: [[IF_END]]:
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; CHECK-NEXT: tail call void (...) @bees(i8 0)
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; CHECK-NEXT: tail call void (...) @llvm.fake.use(i8 [[CONV]])
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; CHECK-NEXT: br label %[[LAB]]
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; CHECK: [[LAB]]:
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; CHECK-NEXT: ret i32 1
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;
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%conv = fptosi float %f to i8
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%tobool3 = icmp eq i8 %conv, 0
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br i1 %tobool3, label %if.end, label %lab
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if.end:
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tail call void (...) @bees(i8 %conv)
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tail call void (...) @llvm.fake.use(i8 %conv)
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br label %lab
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lab:
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ret i32 1
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}
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declare i32 @bar(...)
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declare void @baz(i32)
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declare void @bees(i32)
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declare void @func1(...)
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