Souper says:

; Function: fn1
%0:i32 = var 
%1:i1 = ne 0:i32, %0
%2:i32 = var 
%3:i1 = slt 0:i32, %2
%4:i1 = slt %2, 1:i32
%5:i1 = and %1, %3, %4
cand %5 0:i1

COMMAND: /home/regehr/souper/build/souper -stp-path=/usr/local/bin/stp reduce_463/foo.bc

LLVM says:

define i32 @fn1() #0 {
entry:
  %0 = load i32* @a, align 4, !tbaa !1
  %tobool = icmp ne i32 %0, 0
  %1 = load i32* @b, align 4
  %cmp = icmp sgt i32 %1, 0
  %or.cond = and i1 %tobool, %cmp
  %cmp1 = icmp slt i32 %1, 1
  %cmp1. = and i1 %or.cond, %cmp1
  %land.ext = zext i1 %cmp1. to i32
  ret i32 %land.ext
}

COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -c -w -emit-llvm -O3 reduce_463/foo.c -o reduce_463/foo.bc

C source code:

int a, b;
int fn1() { return a && b > 0 && b <= 0; }

x86-64 from LLVM:

fn1:                                    # @fn1
	cmpl	$0, a(%rip)
	setne	%al
	cmpl	$0, b(%rip)
	setg	%cl
	setle	%dl
	andb	%al, %cl
	andb	%dl, %cl
	movzbl	%cl, %eax
	retq

COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -w -O3 reduce_463/foo.c -S -o -

x86-64 from GCC:

fn1:
	xorl	%eax, %eax
	ret

COMMAND: gcc -w -O3 reduce_463/foo.c -S -o -