Souper says:

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

COMMAND: /home/regehr/souper/build/souper -stp-path=/usr/local/bin/stp reduce_367/foo.bc

LLVM says:

define void @fn1() #0 {
entry:
  %0 = load i32* @a, align 4, !tbaa !1
  %cmp = icmp sgt i32 %0, 0
  %conv = zext i1 %cmp to i32
  store i32 %conv, i32* @b, align 4, !tbaa !1
  %div = udiv i32 1, %conv
  %tobool = icmp ne i32 %div, 0
  %div. = select i1 %tobool, i32 %div, i32 1
  store i32 %div., i32* @c, align 4, !tbaa !1
  ret void
}

COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -c -w -emit-llvm -O3 reduce_367/foo.c -o reduce_367/foo.bc

C source code:

int a, b, c;
void fn1() {
  b = a > 0;
  c = 1 / b ?: 1;
}

x86-64 from LLVM:

fn1:                                    # @fn1
	cmpl	$0, a(%rip)
	setg	%al
	movzbl	%al, %ecx
	movl	%ecx, b(%rip)
	movl	$1, %esi
	movl	$1, %eax
	xorl	%edx, %edx
	divl	%ecx
	testl	%eax, %eax
	cmovnel	%eax, %esi
	movl	%esi, c(%rip)
	retq

COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -w -O3 reduce_367/foo.c -S -o -

x86-64 from GCC:

fn1:
	movl	a(%rip), %edx
	xorl	%eax, %eax
	movl	$1, c(%rip)
	testl	%edx, %edx
	setg	%al
	movl	%eax, b(%rip)
	ret

COMMAND: gcc -w -O3 reduce_367/foo.c -S -o -