mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
8e3ef7f186
This is a follow-on to r227491 which tightens the check for propagating FP values. If a non-constant value happens to be a zero, we would hit the same bug as before. Bug noted and patch suggested by Eli Friedman. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230564 91177308-0d34-0410-b5e6-96231b3b80d8
171 lines
3.6 KiB
LLVM
171 lines
3.6 KiB
LLVM
; 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
|
|
}
|