diff options
Diffstat (limited to 'llvm/test/CodeGen/X86/pr160612.ll')
-rw-r--r-- | llvm/test/CodeGen/X86/pr160612.ll | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/pr160612.ll b/llvm/test/CodeGen/X86/pr160612.ll new file mode 100644 index 0000000..6572c42 --- /dev/null +++ b/llvm/test/CodeGen/X86/pr160612.ll @@ -0,0 +1,74 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py +; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -O2 | FileCheck %s + +; Test for issue #160612: OR conditions in branches should use multiple branches +; instead of materializing booleans with SETCC when no special optimizations apply. + +declare void @subroutine_foo() +declare void @subroutine_bar() + +; Original issue: (x == 0 || y == 0) was generating SETCC + TEST + BRANCH +; instead of using two conditional branches directly. +define void @func_a(i32 noundef %x, i32 noundef %y) { +; CHECK-LABEL: func_a: +; CHECK: # %bb.0: # %entry +; CHECK-NEXT: testl %edi, %edi +; CHECK-NEXT: je subroutine_foo@PLT # TAILCALL +; CHECK-NEXT: # %bb.1: # %entry +; CHECK-NEXT: testl %esi, %esi +; CHECK-NEXT: jne subroutine_bar@PLT # TAILCALL +; CHECK-NEXT: # %bb.2: # %if.then +; CHECK-NEXT: jmp subroutine_foo@PLT # TAILCALL +entry: + %cmp = icmp eq i32 %x, 0 + %cmp1 = icmp eq i32 %y, 0 + %or.cond = or i1 %cmp, %cmp1 + br i1 %or.cond, label %if.then, label %if.else + +if.then: + tail call void @subroutine_foo() + br label %if.end + +if.else: + tail call void @subroutine_bar() + br label %if.end + +if.end: + ret void +} + +; Reference implementation that already generated optimal code. +; This should continue to generate the same optimal code. +define void @func_b(i32 noundef %x, i32 noundef %y) { +; CHECK-LABEL: func_b: +; CHECK: # %bb.0: # %entry +; CHECK-NEXT: testl %edi, %edi +; CHECK-NEXT: je subroutine_foo@PLT # TAILCALL +; CHECK-NEXT: # %bb.1: # %if.else +; CHECK-NEXT: testl %esi, %esi +; CHECK-NEXT: je subroutine_foo@PLT # TAILCALL +; CHECK-NEXT: # %bb.2: # %if.else3 +; CHECK-NEXT: jmp subroutine_bar@PLT # TAILCALL +entry: + %cmp = icmp eq i32 %x, 0 + br i1 %cmp, label %if.then, label %if.else + +if.then: + tail call void @subroutine_foo() + br label %if.end4 + +if.else: + %cmp1 = icmp eq i32 %y, 0 + br i1 %cmp1, label %if.then2, label %if.else3 + +if.then2: + tail call void @subroutine_foo() + br label %if.end4 + +if.else3: + tail call void @subroutine_bar() + br label %if.end4 + +if.end4: + ret void +} |