| ; RUN: opt -gvn -S < %s | FileCheck %s |
| |
| define i32 @f1(i32 %x) { |
| ; CHECK-LABEL: define i32 @f1( |
| bb0: |
| %cmp = icmp eq i32 %x, 0 |
| br i1 %cmp, label %bb2, label %bb1 |
| bb1: |
| br label %bb2 |
| bb2: |
| %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ] |
| %foo = add i32 %cond, %x |
| ret i32 %foo |
| ; CHECK: bb2: |
| ; CHECK: ret i32 %x |
| } |
| |
| define i32 @f2(i32 %x) { |
| ; CHECK-LABEL: define i32 @f2( |
| bb0: |
| %cmp = icmp ne i32 %x, 0 |
| br i1 %cmp, label %bb1, label %bb2 |
| bb1: |
| br label %bb2 |
| bb2: |
| %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ] |
| %foo = add i32 %cond, %x |
| ret i32 %foo |
| ; CHECK: bb2: |
| ; CHECK: ret i32 %x |
| } |
| |
| define i32 @f3(i32 %x) { |
| ; CHECK-LABEL: define i32 @f3( |
| bb0: |
| switch i32 %x, label %bb1 [ i32 0, label %bb2] |
| bb1: |
| br label %bb2 |
| bb2: |
| %cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ] |
| %foo = add i32 %cond, %x |
| ret i32 %foo |
| ; CHECK: bb2: |
| ; CHECK: ret i32 %x |
| } |
| |
| declare void @g(i1) |
| define void @f4(i8 * %x) { |
| ; CHECK-LABEL: define void @f4( |
| bb0: |
| %y = icmp eq i8* null, %x |
| br i1 %y, label %bb2, label %bb1 |
| bb1: |
| br label %bb2 |
| bb2: |
| %zed = icmp eq i8* null, %x |
| call void @g(i1 %zed) |
| ; CHECK: call void @g(i1 %y) |
| ret void |
| } |
| |
| define double @fcmp_oeq_not_zero(double %x, double %y) { |
| entry: |
| %cmp = fcmp oeq double %y, 2.0 |
| br i1 %cmp, label %if, label %return |
| |
| if: |
| %div = fdiv double %x, %y |
| br label %return |
| |
| return: |
| %retval = phi double [ %div, %if ], [ %x, %entry ] |
| ret double %retval |
| |
| ; CHECK-LABEL: define double @fcmp_oeq_not_zero( |
| ; CHECK: %div = fdiv double %x, 2.0 |
| } |
| |
| define double @fcmp_une_not_zero(double %x, double %y) { |
| entry: |
| %cmp = fcmp une double %y, 2.0 |
| br i1 %cmp, label %return, label %else |
| |
| else: |
| %div = fdiv double %x, %y |
| br label %return |
| |
| return: |
| %retval = phi double [ %div, %else ], [ %x, %entry ] |
| ret double %retval |
| |
| ; CHECK-LABEL: define double @fcmp_une_not_zero( |
| ; CHECK: %div = fdiv double %x, 2.0 |
| } |
| |
| ; PR22376 - We can't propagate zero constants because -0.0 |
| ; compares equal to 0.0. If %y is -0.0 in this test case, |
| ; we would produce the wrong sign on the infinity return value. |
| define double @fcmp_oeq_zero(double %x, double %y) { |
| entry: |
| %cmp = fcmp oeq double %y, 0.0 |
| br i1 %cmp, label %if, label %return |
| |
| if: |
| %div = fdiv double %x, %y |
| br label %return |
| |
| return: |
| %retval = phi double [ %div, %if ], [ %x, %entry ] |
| ret double %retval |
| |
| ; CHECK-LABEL: define double @fcmp_oeq_zero( |
| ; CHECK: %div = fdiv double %x, %y |
| } |
| |
| define double @fcmp_une_zero(double %x, double %y) { |
| entry: |
| %cmp = fcmp une double %y, -0.0 |
| br i1 %cmp, label %return, label %else |
| |
| else: |
| %div = fdiv double %x, %y |
| br label %return |
| |
| return: |
| %retval = phi double [ %div, %else ], [ %x, %entry ] |
| ret double %retval |
| |
| ; CHECK-LABEL: define double @fcmp_une_zero( |
| ; CHECK: %div = fdiv double %x, %y |
| } |
| |
| ; We also cannot propagate a value if it's not a constant. |
| ; This is because the value could be 0.0 or -0.0. |
| |
| define double @fcmp_oeq_maybe_zero(double %x, double %y, double %z1, double %z2) { |
| entry: |
| %z = fadd double %z1, %z2 |
| %cmp = fcmp oeq double %y, %z |
| br i1 %cmp, label %if, label %return |
| |
| if: |
| %div = fdiv double %x, %z |
| br label %return |
| |
| return: |
| %retval = phi double [ %div, %if ], [ %x, %entry ] |
| ret double %retval |
| |
| ; CHECK-LABEL: define double @fcmp_oeq_maybe_zero( |
| ; CHECK: %div = fdiv double %x, %z |
| } |
| |
| define double @fcmp_une_maybe_zero(double %x, double %y, double %z1, double %z2) { |
| entry: |
| %z = fadd double %z1, %z2 |
| %cmp = fcmp une double %y, %z |
| br i1 %cmp, label %return, label %else |
| |
| else: |
| %div = fdiv double %x, %z |
| br label %return |
| |
| return: |
| %retval = phi double [ %div, %else ], [ %x, %entry ] |
| ret double %retval |
| |
| ; CHECK-LABEL: define double @fcmp_une_maybe_zero( |
| ; CHECK: %div = fdiv double %x, %z |
| } |