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Diffstat (limited to 'test/CodeGen/X86/scheduler-backtracking.ll')
-rw-r--r-- | test/CodeGen/X86/scheduler-backtracking.ll | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/test/CodeGen/X86/scheduler-backtracking.ll b/test/CodeGen/X86/scheduler-backtracking.ll new file mode 100644 index 0000000..98471ee --- /dev/null +++ b/test/CodeGen/X86/scheduler-backtracking.ll @@ -0,0 +1,51 @@ +; RUN: llc -march=x86-64 < %s -pre-RA-sched=list-ilp | FileCheck %s +; RUN: llc -march=x86-64 < %s -pre-RA-sched=list-hybrid | FileCheck %s +; RUN: llc -march=x86-64 < %s -pre-RA-sched=source | FileCheck %s +; RUN: llc -march=x86-64 < %s -pre-RA-sched=list-burr | FileCheck %s +; RUN: llc -march=x86-64 < %s -pre-RA-sched=linearize | FileCheck %s + +; PR22304 https://llvm.org/bugs/show_bug.cgi?id=22304 +; Tests checking backtracking in source scheduler. llc used to crash on them. + +; CHECK-LABEL: test1 +define i256 @test1(i256 %a) { + %b = add i256 %a, 1 + %m = shl i256 %b, 1 + %p = add i256 %m, 1 + %v = lshr i256 %b, %p + %t = trunc i256 %v to i1 + %c = shl i256 1, %p + %f = select i1 %t, i256 undef, i256 %c + ret i256 %f +} + +; CHECK-LABEL: test2 +define i256 @test2(i256 %a) { + %b = sub i256 0, %a + %c = and i256 %b, %a + %d = call i256 @llvm.ctlz.i256(i256 %c, i1 false) + ret i256 %d +} + +; CHECK-LABEL: test3 +define i256 @test3(i256 %n) { + %m = sub i256 -1, %n + %x = sub i256 0, %n + %y = and i256 %x, %m + %z = call i256 @llvm.ctlz.i256(i256 %y, i1 false) + ret i256 %z +} + +declare i256 @llvm.ctlz.i256(i256, i1) nounwind readnone + +; CHECK-LABEL: test4 +define i64 @test4(i64 %a, i64 %b) { + %r = zext i64 %b to i256 + %u = add i256 %r, 1 + %w = and i256 %u, 1461501637330902918203684832716283019655932542975 + %x = zext i64 %a to i256 + %c = icmp uge i256 %w, %x + %y = select i1 %c, i64 0, i64 1 + %z = add i64 %y, 1 + ret i64 %z +} |